Loading (50 kb)...'
(continued)
(Title 24, Part 3, Section 600-2(a).)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2560.10. Clearances.
(a) Vertical and Horizontal. Signs and outline system enclosures shall have not less than the vertical and horizontal clearances from open conductors specified in the following table:
TABLE 2560.10
CLEARANCES
_____________________________________________________________________________
Vertical clearance above all signs upon which persons can walk....... 8 feet
Vertical clearance above all signs upon which persons cannot walk.... 3 feet
Vertical clearance under signs....................................... 3 feet
Horizontal clearance from signs...................................... 3 feet
_____________________________________________________________________________
(Title 24, Part 3, Section 3-600-10(a).)
(b) Elevation. The bottom of sign and outline lighting enclosures shall not be less than 16 feet above areas accessible to vehicles.
Exception: The bottom of such enclosures may be less than 16 feet above areas accessible to vehicles where such enclosures are protected from physical damage.
(Title 24, Part 3, Section 600-10(b).)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2561.1. Scope.
This Article applies to cranes and hoists of rated capacity exceeding one (1) ton.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
s 2561.2. Special Requirements for Particular Locations.
Combustible Materials. Where a crane or hoist operates over readily combustible material, the resistors shall be placed in a well ventilated cabinet composed of noncombustible material so constructed that it will not emit flames or molten metal.
Exception: Resistors shall be permitted to be located in a cage or cab constructed of noncombustible material which encloses the sides of the cage or cab from the floor to a point at least 6 inches above the top of the resistors.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2561.3. Clearance.
(a) On every new installation, major replacement, modification or repair made after March 15, 1972, the dimension of the working space in the direction of access to energized parts which are likely to require examination, adjustment, service, or maintenance while energized shall be in accordance with Section 2340.16 of these orders.
Note: For the purpose of this section, a major replacement, modification, or repair shall mean 50 percent or more of the current replacement value of the crane or hoist.
On all installations made prior to March 15, 1972 which do not comply with the provisions of Section 2340.16, the employer shall provide control cabinets and enclosure doors which open at least 90 degrees or are removable.
(b) On floor operated overhead cranes a suitable work platform with means of access shall be provided, attached to the building structure, or on the overhead crane bridge, giving ready and safe access to electrical control cabinets for service, maintenance or repair.
Exception: Floor operated porta-lift type platforms, rolling scaffolds or similar type platforms may be used.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2561.7. Lifting Magnets.
All cranes using a lifting magnet shall have a magnet circuit switch of the enclosed type with provision for locking in the "open" position. A separate means for discharging the inductive load of the magnet shall be provided.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
s 2561.8. Remote Control Circuits.
Switching devices shall not be placed in the grounded conductor of remote control circuits.
(Title 24, Part 3, Section 3-610-16.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2561.11. Wiring Method.
Conductors shall be enclosed in a raceway or shall be Type MC or MI cable.
Exception: No. 1: Contact conductors so located or arranged that persons cannot inadvertently touch energized parts or bring conducting material into contact with them.
Exception: No. 2: Short lengths of open conductors at resistors, collectors, DC motors and other equipment so located or arranged that persons cannot inadvertently touch energized parts or bring conducting material into contact with them.
Exception: No. 3: Where flexibility is necessary, multi-conductor cable may be used.
Exception: No. 4: Where multi-conductor cable is used with a suspended push button station, the station shall be supported in some suitable manner that protects the electrical connections against strain.
(Title 24, Part 3, Section 610-11.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2561.31. Track and Runway Conductor Disconnecting Means.
Suitable disconnecting means shall be readily accessible and operable from the ground, shall be arranged to be locked in the "open" position, shall open all ungrounded conductors simultaneously, and shall be placed within view of the track and runway contact conductors.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
s 2561.32. Disconnecting Means for Cranes and Hoists.
A motor circuit switch or circuit breaker arranged to be locked in the "open" position shall be provided in the leads from the track and runway contact conductors or other power supply on all cranes and monorail hoists.
Exception: Where a monorail hoist, monorail crane or hand-propelled crane bridge installation meets all of the following, the disconnect may be omitted:Where a monorail hoist, monorail crane or hand-propelled crane bridge installation meets all of the following, the disconnect may be omitted: 1. The unit is floor controlled. 2. The unit is within view of the power supply disconnecting means. 3. No fixed work platform has been provided for servicing the unit.
Where the disconnecting means is not readily accessible from the crane or monorail operating station, means shall be provided at the operating station to open the power to all motors of the crane or monorail hoist.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
s 2561.50. Controls.
(a) Cranes or hoists not equipped with spring-return controls or momentary contact pushbuttons, shall be provided with a device which will disconnect all motors from the line on failure of line power and will not permit any motor to be restarted on line power until the control handle is brought to the "off" position, or a reset switch or button is operated.
(b) Crane or hoist controls that are rope or line actuated, shall automatically return to the "off" position when released by the operator.
(c) Lever-operated controls shall be provided with a mechanical device which will hold the handle in the "off" position, requiring voluntary effort to move it from the "off" position to the "on" position.
(d) All manually operated controls shall be plainly marked to indicate their function and the equipment they control. As far as is practicable, the movement of each control handle shall be in the same general direction as the resultant movement of the load.
(e) Control handles shall be located within convenient reach of the operator.
(f) Controls for the bridge and trolley shall be so located that the operator can readily see the direction of travel while operating the controls.
(g) All electric cranes of similar design operating in a given plant shall be so wired that like motion of control handles will produce like effect in similarly controlled mechanisms.
(h) Automatic or remote-operated cranes shall function so that if the control signal for any crane motion becomes ineffective, crane motion will stop.
(i) Pendant control shall return to the "off" position when released by the operator.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2561.51. Separate Controls.
Each motor shall be provided with an individual controller.
Exception: No. 1: Where two or more motors drive a single hoist, carriage, truck, or bridge, they shall be permitted to be controlled by a single controller.
Exception: No. 2: One controller shall be permitted to be switched between motors provided:
(a) The controller's horsepower rating is not lower than the horsepower rating of the largest motor.
(b) Only one motor is operated at one time.
(Title 24, Part 3, Section 610-51.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2561.55. Limit Switch.
A limit switch or other device shall be provided to prevent the load block from passing the safe upper limit of travel of any hoisting mechanism.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2563.22. Overcurrent Protection.
Overcurrent protection for motor generator arc welders shall be as provided in (a) below. Where the nearest standard rating of the overcurrent device used is under the value specified in this Section, or where the rating or setting specified results in unnecessary opening of the overcurrent device, the next higher rating or setting shall be permitted.
(a) Each welder shall have overcurrent protection rated or set at not more than 200 percent of the rated primary current of the welder.
Exception: An overcurrent device shall not be required for a welder having supply conductors protected by an overcurrent device rated or set at not more than 200 percent of the rated primary current of the welder.
(Title 24, Part 3, Section 630-22.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2563.23. Disconnecting Means -Arc Welders.
(a) A disconnecting means shall be provided in the supply circuit for each motor-generator arc welder and for each AC transformer and DC rectifier arcwelder which is not equipped with a disconnect mounted as an integral part of the welder.
(Title 24, Part 3, Section 3-630-23.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2563.33. Disconnecting Means -Resistance Welders.
(a) A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be isolated from the supply circuit. The ampere rating of this disconnecting means may not be less than the supply conductor ampacity.
(Title 24, Part 3, Section 630-33.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2564.1. Scope.
This Article covers equipment and wiring for sound recording and reproduction, centralized distribution of sound, public address, speech-input systems, and electronic organs.
(Title 24, Part 3, Section 640-1.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2564.6. Grouping of Conductors.
Conductors of different systems grouped in the same conduit or other metal enclosure or in portable cords or cables shall comply with (a) through (c) below.
(a) Power-Supply Conductors. Power-supply conductors shall be properly identified and shall be used solely for supplying power to the equipment to which the other conductors are connected.
(b) Leads to Motor Generator or Rotary Converter. Input leads to a motor generator or rotary converter shall be run separately from the output leads.
(c) Conductor Insulation. The conductors shall be insulated individually, or collectively in groups, by insulation at least equivalent to that on the power supply and other conductors.
Exception: Where the power supply and other conductors are separated by a lead sheath or other continuous metallic covering.
(Title 24, Part 3, Section 640-6.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2565.1. Disconnecting Means.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2565.2. Supply Circuits and Interconnecting Cables.
(a) Branch-Circuit Conductors. The branch-circuit conductors to which one or more units of a data processing system are connected to a source of supply shall have an ampacity not less than 125 percent of the total connected load.
(b) Connecting Cables. The data processing system shall be permitted to be connected by means of computer or data processing cable or flexible cord and an attachment plug cap or cord-set assembly specifically approved as a part of the data processing system. Separate units shall be permitted to be interconnected by means of flexible cords and cables specifically approved as part of the data processing system. When run on the surface of the floor, they shall be protected against physical damage.
(c) Under Raised Floors. Power cables, communications cables and interconnecting cables associated with the data processing equipment shall be permitted under a raised floor provided:
(1) The raised floor is of suitable construction.
(2) The branch-circuit supply conductors to receptacles are in rigid metal conduit, intermediate metal conduit, electrical metallic tubing, metal wireway, metal surface raceway with metal cover, flexible metal conduit, liquidtight flexible metal conduit, mineral-insulated, metal-sheathed cable, metal-clad cable, or Type AC cable.
(e) Ventilation in the underfloor area is used for the data processing equipment and data processing area only.
(Title 24, Part 3, Section 645.2.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2565.3. Disconnecting Means.
A disconnecting means shall be provided to disconnect the power to all electronic equipment in data processing or computer rooms. This disconnecting means shall be controlled from locations readily accessible to the operator at the principal exit doors. There shall also be a similar disconnecting means to disconnect the air conditioning system serving this area.
(Title 24, Part 3, Section 645-3.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2568.2. Definitions.
Irrigation Machines. An irrigation machine is an electrically driven or controlled machine, with one or more motors, not hand portable, and used primarily to transport and distribute water for agricultural purposes.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2568.4. Irrigation Cable.
(a) Supports. Irrigation cable shall be secured by approved straps, hangers or similar fittings so designed and installed as not to injure the cable. Cable shall be supported at intervals not exceeding 4 feet.
(b) Fittings. Fittings shall be used at all points where irrigation cable terminates. The fittings shall be designed for use with the cable and shall be suitable for the conditions of service.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2568.8. Disconnecting Means.
The main disconnecting means for a center pivot irrigation machine shall be located at the point of connection of electrical power to the machine and shall be readily accessible and capable of being locked in the open position. A disconnecting means shall be provided for each motor and controller.
(Title 24, Part 3, Section 675-8(b), (c).)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2568.12. Grounding.
The following equipment shall be grounded:
(a) All electrical equipment on the irrigation machine.
(b) All electrical equipment associated with the irrigation machine.
(c) Metallic junction boxes and enclosures.
(d) Control panels or control equipment that supply or control electrical equipment to the irrigation machine.
EXCEPTION: Grounding shall not be required on machines where all of the following provisions are met:
(1) The machine is electrically controlled but not electrically driven.
(2) The control voltage is 30 volts or less.
(3) The control or signal circuits are current limited.
(Title 24, Part 3, Section 675-12.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2568.15. Lightning Protection.
If an electrically driven or controlled irrigation machine has a stationary point, a driven ground rod shall be connected to the machine at the stationary point for lightning protection.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2568.16. Energy from More Than One Source.
Equipment within an enclosure receiving electrical energy from more than one source shall not be required to have a disconnecting means for the additional source, provided that its voltage is 30 volts or less.
(Title 24, Part 3, Section 675-16).
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2568.23. Disconnecting Means.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2569.1. Scope.
The provisions of this Article apply to electric wiring for and equipment in or adjacent to all swimming, wading, therapeutic, and decorative pools and fountains, whether permanently installed or storable, and to metallic auxiliary equipment, such as pumps, filters, and similar equipment. Therapeutic pools in health care facilities are exempt from these provisions.
(Title 24, Part 3, Section 680-1.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2569.6. Receptacles and Lighting.
(a) Receptacles. A single receptacle of the locking and grounding type that provides power for a permanently installed swimming pool recirculating pump motor may be located not less than 5 feet from the inside walls of a pool. All other receptacles on the property shall be located at least 10 feet from the inside walls of a pool. Receptacles which are located within 15 feet of the inside walls of the pool shall be protected by ground-fault circuit interrupters.
Note: In determining these dimensions, the distance to be measured is the shortest path the supply cord of an appliance connected to the receptacle would follow without piercing a floor, wall, or ceiling of a building or other effective permanent barrier.
(b) Lighting Fixtures and Lighting Outlets.
(1) Unless they are 12 feet above the maximum water level, lighting fixtures and lighting outlets may not be installed over a pool or over the area extending 5 feet horizontally from the inside walls of a pool. However, a lighting fixture or lighting outlet which has been installed before April 16, 1981 may be located less than 5 feet measured horizontally from the inside walls of a pool if it is at least 5 feet above the surface of the maximum water level and shall be rigidly attached to the existing structure. It shall also be protected by a ground-fault circuit interrupter installed in the branch circuit supplying the fixture.
(2) Unless installed 5 feet above the maximum water level and rigidly attached to the structure adjacent to or enclosing the pool, lighting fixtures and lighting outlets installed in the area extending between 5 feet and 10 feet horizontally from the inside walls of a pool shall be protected by a ground-fault circuit interrupter.
(Title 24, Part 3, Section 680-6.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2569.7. Cord- and Plug-Connected Equipment.
(a) Flexible cords used with the following equipment may not exceed 3 feet in length and shall have a copper equipment grounding conductor with a grounding-type attachment plug.
(1) Cord- and plug-connected lighting fixtures installed within 16 feet of the water surface of permanently installed pools.
(2) Other cord- and plug-connected, fixed or stationary equipment used with permanently installed pools.
(Title 24, Part 3, Section 680-7.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2569.20. Underwater Lighting Fixtures.
(a) A ground-fault circuit interrupter shall be installed in the branch circuit supplying underwater fixtures operating at more than 15 volts. Equipment installed underwater shall be approved for the purpose.
(b) No underwater lighting fixtures may be installed for operation at over 150 volts between conductors.
(Title 24, Part 3, Section 680-20.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2569.30. Pumps.
A cord-connected swimming pool filter pump shall incorporate an approved system of double insulation or its equivalent, and shall be provided with means of grounding only the internal and nonaccessible noncurrent-carrying metal parts of the appliance.
The means for grounding shall be an equipment grounding conductor run with the power-supply conductors in the flexible cord that is properly terminated in a grounding-type attachment plug having a fixed grounding contact member.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2569.31. Ground-Fault Circuit Interrupters Required.
All electric equipment, including power-supply cords, used with storable swimming pools shall be protected by ground-fault circuit interrupters.
(Title 24, Part 3, Section 680-31.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2569.51. Ground-Fault Circuit Interrupters Required.
All electric equipment operating at more than 15 volts, including power supply cords, used with fountains shall be protected by ground-fault circuit interrupters.
(Title 24, Part 3, Section 680-51(a).)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2571.1. Scope.
The provisions for emergency systems apply to circuits, systems, and equipment intended to supply power for illumination and special loads, in the event of failure of the normal supply.
(Title 24, Part 3, Section 700-1.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2571.4. Tests and Maintenance.
(a) Systems shall be tested periodically on a schedule acceptable to the authority having jurisdiction to assure their maintenance in proper operating condition.
(b) Where battery systems or unit equipments are involved, including batteries used for starting or ignition in auxiliary engines, the authority having jurisdiction shall require periodic maintenance.
(c) A written record shall be kept of such tests and maintenance.
(d) Means for testing all emergency lighting and power systems during maximum anticipated load conditions shall be provided.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2571.14. Emergency Illumination.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2571.16. Emergency Illumination.
Where emergency lighting is necessary, the system shall be so arranged that the failure of any individual lighting element, such as the burning out of a light bulb, cannot leave any space in total darkness.
(Title 24, Part 3, Section 700-16.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2571.19. Switch Location.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2571.21. Switch Location.
(a) All manual switches for controlling emergency circuits shall be in locations convenient to authorized persons responsible for their actuation. In places of assembly, such as theaters, a switch for controlling emergency lighting systems shall be located in the lobby or at a place conveniently accessible thereto.
(b) In no case shall a control switch for emergency lighting in a theater or motion picture theater or place of assembly be placed in a motion picture projection booth or on a stage.
Exception: Where multiple switches are provided, one such switch shall be permitted in such locations where so arranged that it can energize but not disconnect the circuit.
(Title 24, Part 3, Section 700-21.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2571.25. Accessibility.
The branch circuit overcurrent devices in emergency circuits shall be accessible to authorized persons only.
(Title 24, Part 3, Section 700-25.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2575.1. Scope.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2575.10. Legally Required Stand-By Power Generation Systems.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2580.1. Scope.
The provisions of this article shall apply to electroplating and electrostripping processes.
(Title 24, Part 3, Section 3-669-1.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2580.2. Wiring Methods.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2580.6. Wiring Methods.
(a) Systems not exceeding 50 volts DC. Insulated open conductors on insulators or bare busbars shall be permitted for the supply of electrolytic installations not exceeding 50 volts DC.
(b) Systems exceeding 50 volts DC.
(1) Insulated open conductors on insulators or bare busbars shall be permitted for the supply of electrolytic installations exceeding 50 volts DC, when guarded as required in Section 2340.17.
Exception: Unguarded bare conductors or busbars shall be permitted at the tanks.
(2) When access to the process while energized is necessary, the entrance door guarding the electrolytic process shall be electrically interlocked so that access by employees will be prevented when the voltage exceeds 50 volts DC.
(Title 24, Part 3, Section 3-669-6.)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
s 2599. General.
(Formerly Article 50)
s 2700. Definitions.
The following definitions of frequently used terms shall be accepted as the intended meanings of these terms whenever used in these High-Voltage Electrical Safety Orders.
Note: Definitions of other terms used in only one article are included in the front of that article.
Accessible.
(A) Accessible (as applied to equipment). Admitting close approach because not guarded by locked doors (unless keys are readily available to those requiring access), elevation or other effective means. (See "Readily Accessible.")
(Title 24, Part 3, Article 100.)
(B) Accessible (as applied to wiring methods). Not permanently closed in by the structure or finish of the building; capable of being removed without disturbing the building structure, finish, or fixed appurtenance thereto. (See "Concealed" and "Exposed.")
(Title 24, Part 3, Article 100.)
(C) Readily Accessible. Capable of being reached quickly for operation, renewal, or inspections, without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders, chairs, etc.
(Title 24, Part 3, Article 100.)
(D) Safely Accessible. Not exposing persons installing, operating, maintaining, or inspecting electrical apparatus to serious risks of tripping or falling or of coming in contact with energized electrical parts, moving machinery, surfaces or objects operating at high temperatures, or other hazardous equipment.
Aerial Lift. A device used to raise workers to an elevated position.
Ambient Temperature. The temperature of the cooling medium that comes in contact with the device or equipment.
Ampacity. Current-carrying capacity of electric conductors expressed in amperes.
Apparatus Case. The case (or tank) of electrical apparatus is that part which serves as the container for the principal energized parts and insulating medium.
Askarel. A generic term for a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media. Askarels of various compositional types are used. Under arcing conditions the gases produced, while consisting predominantly of noncombustible hydrogen chloride, can include varying amounts of combustible gases depending upon the askarel type.
Atmosphere.
(See Environment, also.)
(A) Contaminated Atmosphere. An atmosphere containing contaminants which tend to impair the effectiveness of electrical insulation.
(B) Corrosive Atmosphere. An atmosphere containing contaminants which react chemically with the parts of an electrical installation so as to impair its electrical conductivity and/or its mechanical strength.
(C) Explosive Atmosphere. (See Article 34.)
(D) Flammable Atmosphere. (See Article 34.)
Authorized Person. A qualified person delegated to perform specific duties under the conditions existing.
Automatic Circuit Recloser. A self-controlled device for automatically interrupting and reclosing an alternating current circuit, with a predetermined sequence of opening and reclosing followed by resetting, hold closed, or lockout operation.
(Title 24, Part 3, Article 3-100.)
Automatic Opening. (Tripping). The opening of a switching device under predetermined conditions without the intervention of an attendant.
(Title 24, Part 3, Article 3-100.)
AWG. American Wire Gauge.
Barricade. Physical obstruction such as tapes, screens or cones intended to warn and limit access to a hazardous area.
Barrier. Physical obstruction which is intended to prevent contact with energized lines or equipment.
(Title 24, Part 3, Article 3-100.)
Basic Impulse Level (BIL). (See Ratings.)
(Title 24, Part 3, Article 3-100.)
Bonding. The permanent joining of metallic parts to form an electrically conductive path which will assure electrical continuity and the capacity to conduct safely any current likely to be imposed.
(Title 24, Part 3, Article 100.)
Bonding Jumper. A reliable conductor to assure the required electrical conductivity between metal parts required to be electrically connected.
(Title 24, Part 3, Article 100.)
Branch Circuit. That portion of a wiring system extending beyond the automatic overcurrent protective device, excluding any thermal cutout or motor running overload protective device that is not approved for short circuit duty.
Bus.
(A) Isolated Phase Bus. One in which each phase conductor is enclosed by an individual metal housing separated from adjacent conductor housings by an air space.
(B) Non-Segregated Phase Bus. One in which all phase conductors are in a common metal enclosure without barriers between phases.
(C) Segregated Phase Bus. One in which all phase conductors are in a common metal enclosure but are segregated by barriers between phases.
(Title 24, Part 3, Article 3-100.)
Bushing. An insulating structure including a through conductor, or providing a passageway for such a conductor, with provision for mounting on a barrier, conducting or otherwise, for the purpose of insulating the conductor from the barrier and conducting current from one side of the barrier to the other.
(Title 24, Part 3, Article 3-100.)
BWG. Birmingham Wire Gauge.
Cable, Electrical. A stranded conductor (single-conductor cable) or a combination of conductors insulated from one another (multiple-conductor cable).
(Title 24, Part 3, Article 3-100.)
Cable Riser. (See Riser.)
Cable Sheath. A protective covering applied to cables.
Note: A cable sheath shall be permitted consist of multiple layers of which one or more is conductive.
(Title 24, Part 3, Article 3-100.)
Cable Terminations.
(A) Pothead. A device for the electrical and mechanical termination of an insulated electrical cable.
(B) Stress Cone. Cable termination which provides electrical stress relief for an insulated electrical cable.
(C) Terminal Chamber (Conduit Box). A separate compartment on electrical apparatus for terminating insulated electrical cables.
(D) Wiping Sleeve. A hollow, cylindrical, metal attachment to the tank (or case) or terminal chamber of electrical apparatus which is used for the mechanical termination of lead-sheathed insulated electrical cable.
(Title 24, Part 3, Article 3-100.)
Case (Tank). (See Apparatus Case.)
Circuit. A conductor or system of conductors through which an electric current is intended to flow.
Circuit Breaker. (See Switching Devices.)
(Title 24, Part 3, Article 100.)
Clearance (Authorization). Authorization to enter an area and/or to perform an ct restricted to authorized personnel.
Clearing Time. The time elapsing from the beginning of an overcurrent to the final circuit interruption.
(Title 24, Part 3, Article 3-100.)
Close and Hold. (See Ratings.)
(Title 24, Part 3, Article 3-100.)
Collector Ring. An assembly of slip rings for transferring electrical energy between a stationary and a rotating member.
(Title 24, Part 3, Article 3-100.)
Communication Lines. The conductors and their supporting or containing structures which are used for public or private signal or communication service, and which operate at potentials not exceeding 400 volts to ground or 750 volts between any two points of the circuit, and the transmitted power of which does not exceed 150 watts. When operating at less than 150 volts no limit is placed on the capacity of the system.
Note: Telephone, telegraph, railroad signal, data, clock, fire, police-alarm, community television antenna, and other systems conforming with the above are included. Lines used for signaling purposes, but not included under the above definition, are considered as supply lines of the same voltage and are to be so run.
Concealed. Rendered inaccessible by enclosures, raceways, structures, the finish of a building, etc.
(Title 24, Part 3, Article 3-100.)
Conductor. A wire, cable, or other conducting material suitable for carrying current.
(Title 24, Part 3, Article 3-100.)
Construction. The erection of new wiring and equipment, and the alteration, conversion, and improvement of existing wiring and equipment.
Contactor. A device for repeatedly establishing and interrupting an electric power circuit.
(Title 24, Part 3, Article 3-100.)
Contaminated. (See Atmosphere.)
Control.
(A) Automatic Control. An arrangement of electrical controls that provides for switching or otherwise controlling or both in an automatic sequence and under predetermined conditions the necessary devices comprising an equipment. These devices thereupon maintain the required character of service and provide adequate protection against all usual operating emergencies.
(B) Manual Control. Control in which the main devices, whether manually or power operated, are controlled by an attendant.
(C) Manual Operation. Operation by hand without using any other source of power.
(Title 24, Part 3, Article 3-100.)
Controller. A device, or group of devices, which serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected.
(Title 24, Part 3, Article 100.)
Corrosive. (See Atmosphere.)
Current.
(A) Asymmetrical Current. The combination of the symmetrical and the direct current component of the current.
(B) Available (Prospective) Short Circuit Current (at a given point in a circuit). The maximum current that the power system can deliver through a given circuit point to any negligible impedance short circuit applied at the given point, or at any other point that will cause the highest current to flow through the given point.
(C) Excitation (Magnetizing) Current. The current supplied to unloaded transformers or similar equipment.
(D) Minimum Operating Current (of a relay or fuse). The minimum current that will cause a device to complete its intended operation.
(E) Overcurrent.
1. Fault Current (Short Circuit). A current that flows from one conductor to ground or to another conductor owing to an unintended connection (including an arc) between the two.
2. Overload Current. Any current (exclusive of fault current) in excess of rated current.
(F) Short-Time Current. (See Ratings.)
Cutout. (See Switching Devices.)
(Title 24, Part 3, Article 100.)
Dead. Free from any electrical connection to a source of potential difference and from electrical charges: Not having a potential difference from that of earth.
Dead-Front. So designed, constructed, and installed that no energized parts are normally exposed on the front.
(Title 24, Part 3, Article 3-100.)
De-energized Parts. Parts which have been previously energized and are now free from any electrical connection to a source of potential difference and from electrical charges.
Designated Employee. A qualified person delegated to perform specific duties under the conditions existing.
Dielectric Heating. The heating of a nominally insulating material due to its own dielectric losses when the material is placed in a varying electric field.
Discharge Device. A device intended for the dissipation of the energy stored in a disconnected inductive or capacitive device.
(Title 24, Part 3, Article 3-100.)
Disconnect (Isolator). (See Switching Devices.)
(Title 24, Part 3, Article 3-100.)
Disconnected Position (of a switchgear assembly removable element). That position in which the primary and secondary disconnecting devices of the removable element are separated by a safe distance from the stationary element contacts.
(Title 24, Part 3, Article 3-100.)
Disconnecting Means. (See Switching Devices.)
(Title 24, Part 3, Article 100.)
Division. Unless otherwise designated in this subchapter, the phrase "division" refers to the current Division of Occupational Safety and Health or any of its predecessors including the former Division of Industrial Safety or the Division of Occupational Safety and Health Administration. Reference to the former Division of Industrial Safety or Division of Occupational Safety and Health Administration in these orders is meant to refer to their successor, the Division of Occupational Safety and Health, or any subsequent successor agency.
Drawout Mounted Device. One having disconnecting devices and in which the removable portion may be removed from the stationary portion without the necessity of unbolting connections or mounting supports.
(Title 24, Part 3, Article 3-100.)
Dust-Proof. So constructed or protected that dust will not interfere with its successful operation.
(Title 24, Part 3, Article 3-100.)
Dust-Tight. So constructed that dust will not enter the enclosing case.
(Title 24, Part 3, Article 3-100.)
Duty.
(A) Continuous. A requirement of service that demands operation at a substantially constant load for an indefinitely long time.
(B) Intermittent. A requirement of service that demands operation for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load and rest.
(C) Periodic. A type of intermittent duty in which the load conditions are regularly recurrent.
(D) Short-Time. A requirement of service that demands operation at a substantially constant load for a short and definitely specified time.
(E) Varying. A requirement of service that demands operation at loads, and for intervals of time, both of which may be subject to wide variation.
(Title 24, Part 3, Article 100.)
Electric Line Truck. A truck used to transport workers, tools, and material, and to serve as a traveling workshop for electric power line construction and maintenance work. It is sometimes equipped with a boom and auxiliary equipment for setting poles, digging holes, and elevating material or workers.
Electric Supply Lines. Those conductors used to transmit electric energy and their necessary supporting or containing structures. Signal lines of more than 400 volts to ground are always supply lines within the meaning of the rules, and those of less than 400 volts to ground may be considered as supply lines, if so run and operated throughout.
Enclosed. Surrounded by a fence, wall, case, or housing which will prevent persons from accidentally contacting wiring, equipment, or energized parts contained therein.
(Title 24, Part 3, Article 100.)
Enclosure. The case or housing of apparatus, or the fence or walls surrounding an installation to prevent personnel from accidentally contacting energized parts, or to protect the equipment from physical damage.
(Title 24, Part 3, Article 100.)
Energized Parts (Live Parts). Parts which are of a potential different from that of the earth, or some conducting body which serves in place of the earth.
Environment. (See Atmosphere, also.)
(A) Damp Location. Partially protected locations under canopies, marquees, roofed open porches, and like locations, and interior locations subject to moderate degrees of moisture, such as some basements, some barns, and some cold-storage warehouses.
(B) Dry Location. A location not normally subject to dampness or wetness. A location classified as dry may be temporarily subject to dampness or wetness, as in the case of some buildings under construction.
(C) Wet Location. Installations underground or in concrete slabs or masonry in direct contact with the earth, and locations subject to satura tion with water or other liquids, such as vehicle washing areas, and locations exposed to weather and unprotected.
Equipment. A general term which includes fittings, devices, appliances, fixtures, apparatus, and the like, used as part of, or in connection with, an electrical power transmission and distribution system, or communication systems.
(Title 24, Part 3, Article 100.)
Explosion-Proof Apparatus. Apparatus enclosed in a case which is capable of withstanding an explosion of a specified gas or vapor which may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and which operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby.
(Title 24, Part 3, Article 100.)
Exposed (as applied to energized parts). Energized parts that can be inadvertently touched or approached nearer than a safe distance by a person. Parts not suitably guarded, isolated, or insulated.
(Title 24, Part 3, Article 100.)
Fault. (See Current.)
Feeder. Any conductors of a wiring system between the service equipment, or the generator switchboard of an isolated plant, and the branch circuit overcurrent device.
(Title 24, Part 3, Article 100.)
Fuse. An overcurrent protective device with a circuit opening fusible member directly heated and destroyed by the passage of overcurrent through it. (Note: A fuse comprises all the parts that form a unit capable of performing the prescribed functions. It may or may not be the complete device necessary to connect it into an electrical circuit.)
(A) Expulsion Fuse Unit (Expulsion Fuse). A vented fuse unit inwhich the expulsion effect of gases produced by the arc and lining of the fuseholder, either alone or aided by a spring, extinguishes the arc.
(B) Power Fuse Unit. A vented, non-vented, or controlled vented fuse unit in which the arc is extinguished by being drawn through solid material, granular material, or liquid, either alone or aided by a spring.
1. Vented Power Fuse. A fuse with provision for the escape of arc gases, liquids, or solid particles to the surrounding atmosphere during circuit interruption.
2. Non-Vented Power Fuse. A fuse without intentional provision for the escape of arc gases, liquids, or solid particles to the atmosphere during circuit interruption.
3. Controlled Vented Power Fuse. A fuse with provision for controlling discharge during circuit interruption such that no solid material may be exhausted into the surrounding atmosphere. The discharge gases shall not ignite or damage insulation in the path of the discharge, nor shall these gases propagate a flashover to or between grounded members or conduction members in the path of the discharge when the distance between the vent and such insulation or conduction members conforms to manufacturer's recommendations.
Ground. A conducting connection, whether intentional or accidental, between an electrical circuit or equipment and earth, or to some conducting body which serves in place of the earth.
(A) Ground (Reference). That conducting body, usually earth, to which electric potential is referenced.
(Title 24, Part 3, Article 100.)
Grounded Conductor. A system or circuit conductor which is intentionally grounded.
(Title 24, Part 3, Article 100.)
Grounded, Effectively. Permanently connected to earth through a ground connection of sufficiently low impedance and having sufficient ampacity that ground fault current which may occur cannot build up to voltages dangerous to personnel.
(Title 24, Part 3, Article 100.)
Grounded, Impedance. Connected to ground through a connection in which an impedance has been inserted intentionally.
(Title 24, Part 3, Article 3-100.)
Grounded, Solidly. Grounded through a grounding connection in which no impedance has been inserted intentionally.
(Title 24, Part 3, Article 3-100.)
Grounded System, Impedance. A system which has one conductor or point (usually the mid-tap or neutral point of a transformer or generator windings) connected to the reference ground through an impedance.
(Title 24, Part 3, Article 3-100.)
Grounded System, Solidly. A system which has one conductor or point (usually the mid-tap or neutral point of a transformer or generator windings) connected to the reference ground with no intentional impedance imposed in the circuit.
(Title 24, Part 3, Article 3-100.)
Grounding Conductor, Electrode. The conductor used to connect the grounding electrode to the equipment grounding conductor and/or to the grounded conductor of the circuit at the service, or at the source of a separately derived system.
(Title 24, Part 3, Article 100.)
Grounding Conductor, Equipment. The conductor used to connect noncurrent-carrying metal parts of equipment, raceways and other enclosures to the system grounded conductor at the service and/or the grounding electrode conductor or at the source of a separately derived system. (continued)