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(continued)
Suitable covers shall be installed on all boxes, fittings, and enclosures to prevent accidental contact with live parts or physical damage to parts or insulation.
(Title 24, Part 3, Section 300-31.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2746. Conductors of Different Systems.
Conductors of high-voltage and low-voltage systems shall not occupy the same wiring enclosure or pull and junction boxes except in approved switchgear and control assemblies.
(Title 24, Part 3, Section 300-32.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2747. Inserting Conductors in Raceways.
Raceways, except those used for exposed work and having a removable cover, shall first be installed as a complete raceway system without the conductors. Pull wires, if used, shall not be installed until the raceway system is in place.
Approved pulling compound shall be permitted to be used as a lubricant in inserting conductors in raceways. Cleaning agents or lubricants having a deleterious effect on conductor coverings shall not be used.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.







s 2748. Conductor Bending Radius.
The conductor shall not be bent to a radius less than eight times the overall diameter for non-shielded conductors or twelve times the diameter for shielded or lead-covered conductors during or after installation.
(Title 24, Part 3, Sections 300-34.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2749. Protection Against Induction Heating.








s 2750. Grounding.
Wiring and equipment installations shall be grounded to conform with the applicable provisions of Article 6.
(Title 24, Part 3, Section 300-36.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2751. Overcurrent Devices in Grounded Conductors.
No overcurrent device shall be placed in any permanently grounded conductor, except where the overcurrent device simultaneously opens all conductors of the circuit or for motor running protection.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.















(Formerly Article 57)






s 2752. Size of Pull Boxes and Raceway Entrance Locations.
(a) Pull boxes shall be of sufficient size and design to accommodate the installation and maintenance of all conductors installed in them without damaging the insulation on any conductor.
(Title 24, Part 3, Section 3-370-51(a).)
(b) Where permanent barriers are installed in a box, each section shall be considered as a separate box.
(Title 24, Part 3, Section 3-370-51(d).)
(c) One or more sides of a pull box shall be removable.
(Title 24, Part 3, Section 370-51(c).)
(d) Horizontal conductors of 6 feet or more in length inside the box shall be supported.
(Title 24, Part 3, Section 3-370-51(e).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2753. Construction and Installation Requirements.
(a) Pull boxes shall be made of material inherently resistant to corrosion or shall be suitably protected, both internally and externally, by enameling, galvanizing, plating, or other equivalent means.
(b) Suitable bushings, shields, or fittings having smooth rounded edges shall be provided where conductors pass through partitions and at other locations where necessary.
(c) Pull boxes shall provide a complete enclosure for the contained conductors.
(d) Pull boxes shall be so installed that the wiring is accessible without removing any part of the building. Working space shall be provided in accordance with Article 35.
(e) Pull boxes shall be of a type approved for the respective location in which they are installed.
(f) Pull and junction boxes shall be effectively closed by suitable covers secured against unauthorized entry. Underground pull box covers that weigh over 100 pounds shall be considered secured against unauthorized entry.
(g) Pull boxes and their covers shall be able to withstand the loading to which they may be subjected.
(h) Pull boxes shall be securely fastened or set in place.
(i) Covers for pull and junction boxes used in high-voltage raceway systems shall be labeled "HIGH VOLTAGE." The label shall be on the outside of the box cover and readily visible. Letter shall be block letters at least 1/2 inch in height.
(j) For grounding, see Article 6.
(Title 24, Part 3, Sections 370-52(a)-(e) and 3-370-52(g), (h).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.















(Formerly Article 58)






s 2755. Scope.
Bare open wiring is permitted in enclosed areas which are accessible only to qualified and authorized persons. Such areas shall be restricted to electrical use only and shall be enclosed in accordance with Article 17. This article shall not apply to the internal wiring of enclosed equipment.
See Article 19 for requirements for overhead lines.
(Title 24, Part 3, Section 3-710-35.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2756. Spacing Between Bare Energized Parts and Adjacent Surfaces.
Minimum spacing for bare conductors shall be in accordance with Table 2756, although greater spacing may be required by unusual atmospheric or other special conditions.
Table 2756

Minimum Spacing in Inches Between Bare Energized Parts

and Adjacent Surfaces


______________________________________________________
Voltage Outdoor Indoor
______________________________________________________
Phase Phase Phase Phase Phase
to to to to to
Phase Ground Phase Ground Phase
601 3 1/2 5 3/4 3/4
750 3 1/2 5 3/4 3/4
1200 3 1/2 5 1 1/4 1 1/4
2500 3 1/2 5 2 2 1/2
5000 6 7 2 1/2 4
7500 6 7 4 5
15000 7 12 6 7
23000 10 15 10 15
35000 13 18 13 18
Above 35 KV .37/KV .455/KV 36/KV .455/KV



NOTES:
(1) Spacings shown are minimum for energized parts to energized parts or energized parts to ground for elevations up to 3,300 feet above sea level. From 3,301 to 10,000 feet elevations, increase spacings by 10 percent, and above 10,000 feet elevation, increase spacings by 20 percent. For voltages above 230 KV, spacings shall be as required for the BIL of the system.
(2) For intermediate values of system voltage, use next higher voltage in table.
(Title 24, Part 3, Section 3-710-33.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2757. Insulators.
Insulators and insulator supports shall have sufficient mechanical strength to withstand the maximum stress to which they may be subjected by a fault on the system to which they are applied. Insulators for bare conductors shall have a minimum voltage rating equal to the nominal system voltage.
(Title 24, Part 3, Section 3 -710-84(b).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2758. Clearances.
Clearances over driveways within outdoor transformer or switching enclosures shall conform to Rule 37, General Order No. 95, Rules for Overhead Electric Line Construction, State of California Public Utilities Commission, 1981 Edition, which is hereby incorporated by reference.
Exception: These clearances will not be required for wiring protected by barriers, or screens, or for wiring located so as to prevent accidental contact.
(Title 24, Part 3, Section 3-710-85.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.















(Formerly Article 59)






s 2760. General.
(a) Types and Sizes. Rigid metallic conduit and rigid nonmetallic conduit are approved for general use. Flexible metal conduit shall be permitted to be used as permitted by Section 2881(c). Electrical metallic tubing is not approved for high-voltage installations.
(Title 24, Part 3, Section 3-710-10(a).)
(b) Circuit in a Conduit. The conductors in a conduit shall be only those of a single circuit or feeder with the associated neutral and grounding conductor(s) if used.
(Title 24, Part 3, Section 3-710-10(b).)
(c) Reaming. All ends of conduit shall be reamed to remove rough edges.
(Title 24, Part 3, Section 3-710-10(c).)
(d) Fittings.
(1) Conduit fittings shall be of a size and type which will permit at least the minimum radius cable bend as required by Section 2748 for the size, type, and voltage to be installed. No splices or taps shall be made within conduit fittings.
(2) The conduit shall be secured to each enclosure by locknuts on the inside and outside of the enclosure, by threaded hubs, or by other approved fittings.
Exception: Locknuts are not required where conduit is stubbed through a concrete surface which forms a side of the enclosure.
(3) A bushing shall be installed where cables enter a conduit unless the design of the equipment is such as to afford equal protection.
(Title 24, Part 3, Section 3-710-10(d).)
(e) Conduit Bends. Conduit bends shall be so made that the cable will not be injured and the internal diameter of the conduit is not reduced.
(Title 24, Part 3, Section 3-710-10(e).)
(f) Continuity of System. Conduit shall be installed as a complete continuous system so connected to all boxes, fittings, and enclosures as to provide effective enclosure for the conductors.
(Title 24, Part 3, Section 3-710-10(f).)
(g) Support. The entire system shall be securely fastened in place. Conduits to be encased in concrete shall be secured in place to maintain spacing and alignment during placing and curing of the concrete.
(Title 24, Part 3, Section 3-710-10(g).)
(h) Conduit Fill. The conduit shall be of such size that the sum of the cross-sectional areas of the individual conductors will not be more than the percentage of the interior cross-sectional area of the conduit as shown in Table 2760.
Table 2760


Percent Area of Conduit
Number of Conductors
1 2 3 4 Over 4
All types of conductors.... 60 40 45 50 50


(Title 24, Part 3, Section 3-710-10(h).)
(i) Grounding. Conduit systems shall be grounded as required by Article 6 of these regulations.
(Title 24, Part 3, Section 3-710-7.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2761. Rigid Metal Conduit.
(a) Use. Rigid metal conduit shall be permitted to be used under all atmospheric conditions and occupancies, provided conduits and fittings exposed to the weather or to severe corrosive influences are of corrosion-resistant material or have coatings inside and outside suitable for the conditions. Where dissimilar metals are used, they shall be joined by an approved device or method.
(Title 24, Part 3, Section 3-346-1.)
(b) Running Threads. Running threads shall not be used.
(Title 24, Part 3, Section 3-346-9(b).)
(c) Support. Conduit shall be supported at least every 10 feet. However, rigid metallic runs of conduit made up with approved threaded couplings and uninterrupted by pull boxes shall be permitted to be secured in accordance with Table 2, provided such fastening prevents transmission of stresses to terminus when conduit is deflected between supports.
Table 2761


Maximum Distance Between
Conduit Size Conduit Supports
1/2 inch 10 feet
3/4 inch 10 feet
1 inch 12 feet
1 1/4 inch 14 feet

1 1/2 inch 14 feet
2 inch 16 feet
2 1/2 inch 16 feet
3 inch and larger 20 feet


(Title 24, Part 3, Section 3-346-12.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2762. Rigid Nonmetallic Conduit.
(a) Description. Nonmetallic conduit shall be resistant to moisture, chemical atmospheres, impact and crushing, and distortion due to heat where such conditions are likely to be encountered in service. It shall be weather resistant where installed out of doors.
(Title 24, Part 3, Section 3-347-1.)
(b) Use. Rigid nonmetallic conduit and fittings approved for the purpose shall be permitted to be used for exposed work if properly protected where exposed to severe mechanical damage.
(Title 24, Part 3, Section 3-347-2(b).)
(c) Support. Conduit shall be supported within 4 feet of each box, cabinet, or other conduit termination and shall be adequately supported elsewhere as required in Table 2762.
Table 2762


Maximum Distance Between
Conduit Size Conduit Supports
1/2 inch 4 feet
3/4 inch 4 feet
1 inch 5 feet
1 1/4 inch 5 feet
1 1/2 inch 5 feet
2 inch 5 feet

2 1/2 inch 6 feet
3 inch 6 feet
3 1/2 inch 7 feet
4 inch 7 feet
5 inch 7 feet
6 inch 8 feet


Rigid nonmetallic conduit and fittings approved for the purpose shall be permitted to be used underground if properly protected where exposed to severe mechanical damage.
(Title 24, Part 3, Section 3-347-8.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.















(Formerly Article 60)






s 2764. Grounding.
Metal-enclosed bus shall be grounded in accordance with Article 6.
(Title 24, Part 3, Section 364-22.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2765. Adjacent and Supporting Structures.
Metal-enclosed busways shall be installed so that temperature rise from induced circulating currents in any adjacent metallic parts will not be hazardous to personnel or constitute a fire hazard .
(Title 24, Part 3, Section 364-23.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2766. Neutral.
Neutral bus, where required, shall be sized to carry neutral load current and shall have adequate momentary and short circuit rating consistent with system requirements.
(Title 24, Part 3, Section 364-24.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2767. Barriers and Seals.
Bus runs having sections located both inside and outside of building shall provide a vapor seal at the building wall to prevent interchange of air between indoor and outdoor sections unless forced cooled. Fire barriers shall be provided at walls where fire separation is required.
(Title 24, Part 3, Section 364-25.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2768. Perforated Enclosures.
Where perforated enclosures are used, bus shall be installed in accordance with Article 9, Open Wiring.
(Title 24, Part 3, Section 3-364-27.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2769. Terminations and Connections.
Flexible or expansion connections shall be provided in long, straight runs of bus to allow for temperature expansion or contraction, or where the bus run crosses building vibration insulation joints.
All conductor termination and connection hardware shall be accessible for installation, connection, and maintenance.
Where bus enclosures terminate at machines cooled by flammable atmospheres, seal-off bushings, baffles, or other means shall be provided to prevent accumulation of flammable gas in the bus enclosure.
(Title 24, Part 3, Section 364-28.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2770. Switches.
Switching devices or disconnecting links provided in the bus run shall have the same momentary rating as the bus.
Disconnecting links shall be plainly marked to be removable only when bus is de-energized. Switching devices which are not load break shall be interlocked to prevent operation under load and disconnecting link enclosures shall be interlocked to prevent access to energized parts.
(Title 24, Part 3, Section 364-29.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2771. Identification.
Each bus run shall be provided with a permanent nameplate on which the following information shall be provided:
(a) Rated voltage.
(b) Rated continuous current; if bus is forced cooled, both the normal forced cooled rating and the self-cooled (not forced cooled) rating for the same temperature rise shall be given.
(c) Rated frequency.
(d) Rated impulse withstand voltage.
(e) Rated 60-cycle withstand voltage (dry).
(f) Rated momentary current.
(g) Manufacturer's name and address.
Note: Metal-enclosed buses shall be constructed and tested in accordance with ANSI C37.20 -1969.
(Title 24, Part 3, Section 364-21.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2772. Drain Facilities.
Drain plugs, filter drains, or similar methods shall be provided to remove condensed moisture from low points in bus run.
(Title 24, Part 3, Section 364-26.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2773. Low-Voltage Wiring.
Secondary control devices and wiring which are provided as part of the metal-enclosed bus run shall be isolated by grounded metal barriers from all primary circuit elements with the exception of short lengths of wire, such as at instrument transformer terminals.
(Title 24, Part 3, Section 364-30.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.















(Formerly Article 61)






s 2775. Definition.
A continuous rigid cable support is a unit or an assembly of units or sections, and associated fittings, made of metal or other fire-resistant materials forming a continuous rigid structure used to support cables. Continuous rigid cable supports include ladders, troughs, trays, channels, and other similar structures.
(Title 24, Part 3, Section 318-1.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2776. Use.
Continuous rigid cable supports shall be permitted to be used as the mechanical support for metal-clad cables in fire-resistive building constructions as permitted in Section 2783, but shall not be used in hoistways, or where subjected to severe physical damage. Continuous rigid cable supports shall be permitted to be used to support metal-clad cables in flammable atmospheres as permitted in Article 34.
(Title 24, Part 3, Sections 3-318-2(a) and 318-3.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2777. Installation.
(a) Continuous rigid cable supports shall be installed as a complete support system.
(Title 24, Part 3, Section 3-318-5(a).)
(b) Each run of continuous rigid cable support shall be complete before the installation of cables.
(Title 24, Part 3, Section 318-5(b).)
(c) Where cables may be subjected to physical damage, noncombustible covers or enclosures providing the required protection shall be used.
(Title 24, Part 3, Section 3-318-5(d).)
(d) Continuous rigid cable supports shall be permitted to extend transversely through partitions or walls, other than fire walls, provided the section of the support within the wall is continuous and unventilated.
(Title 24, Part 3, Section 318-5(g).)
(e) Continuous rigid cable supports shall be permitted to extend vertically through floors and platforms, provided the continuous rigid cable support is totally enclosed where it passes through the floor or platform opening and for a distance of 6 feet above the floor or platform to provide protection from physical damage.
(Title 24, Part 3, Section 318-5(g).)
(f) Continuous rigid cable supports shall be permitted to extend vertically through floors and platforms in wet locations where there are curbs or other suitable means to prevent water flow through the floor or platform opening, and the continuous rigid cable support is totally enclosed where it passes through the floor or platform to provide protection from physical damage.
(Title 24, Part 3, Section 318-5(g).)
(g) In other than horizontal runs, the cables shall be fastened securely to transverse members of the continuous rigid cable support.
(Title 24, Part 3, Section 318-7(b).)
(h) A working space of 24 inches minimum shall be maintained on one side of each rigid cable support.
(Title 24, Part 3, Section 3-318-5(i).)
(i) A minimum vertical clearance of 6 inches shall be maintained from the top of the rigid cable support to all ceilings, beams, and other similar obstructions exceeding 24 inches, measured along the length of the cable support.
(Title 24, Part 3, Section 3-318-5(k).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2778. Grounding.
All metal sections of continuous rigid cable supports and fittings shall be electrically continuous and effectively grounded to provide a continuous circuit for fault current. A continuous rigid cable support system shall not be used either as a grounded circuit conductor or as an equipment grounding conductor.
(Title 24, Part 3, Section 3-318-6.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2779. Construction.
Continuous rigid cable supports shall comply with the following:
(a) Shall have suitable strength and rigidity to provide adequate support for all contained wiring.
(b) Shall not present sharp edges, burrs, or projections injurious to the insulation or jackets of the wiring.
(c) If made of metal, shall be adequately protected against corrosion or shall be made of corrosion-resistant material.
(d) Shall have side rails or equivalent structural members.
(e) Shall include fittings for changes in direction and elevation of runs.
(Title 24, Part 3, Section 318-4.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.















(Formerly Article 62)






s 2781. Use.
(a) Metal-clad cable shall be permitted to be used in dry locations.
(b) Metal-clad cable shall be permitted to be used in wet locations, provided the insulated conductors and grounding conductors under the metallic covering are suitable for use in wet locations, and
(1) The metallic covering is impervious to moisture, or

(2) A moisture-resistant jacket is provided over the metallic covering.
(c) Metal-clad cable installed in corrosive locations shall be of a type which is corrosion-resistant or be protected with a covering of corrosion-resistant material.
(d) Metal-clad cable shall be permitted to be used in locations containing flammable atmospheres as permitted in Article 34.
(Title 24, Part 3, Section 3-334-3(d).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2782. Grounding. Grounding Conductor.
An internal grounding conductor or conductors, either copper or aluminum, shall be provided in each cable and shall be grounded in accordance with Article 6.
(Title 24, Part 3, Section 3-334-23.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2783. Supports.
Metal-clad cable shall be permitted to be installed on metal racks, trays, troughs, or continuous rigid cable supports which are effectively grounded. Each cable shall be supported at intervals not exceeding 6 feet and within 2 feet of every box or fitting, and each cable shall be attached to the support at intervals of not more than 10 feet horizontally and 2 feet vertically.
(Title 24, Part 3, Section 3-334-25.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2784. Bends.
All bends shall be so made that the cable will not be injured. (See Section 2748.)
(Title 24, Part 3, Section 334-11.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2785. Fittings.
At all points where metal-clad cable terminates, suitable fittings for use with the particular type of cable and the conditions of service shall be used.
(Title 24, Part 3, Section 3-334-12.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2786. Elevation.
Metal-clad cable shall not be installed below an elevation of 8 fee above working platform or grade without additional mechanical protection.
Exception: Where the cable terminates in the top of metal-enclosed switchgear, transformers, rotating equipment, and other enclosed equipment, the cable may be extended vertically down to the top of the enclosure if adequate mechanical support is provided.
(Title 24, Part 3, Section 3-334-26.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2787. Strength.
The flexible metal enclosure shall provide the equivalent mechanical strength of not less than .025 inch of steel.
(Title 24, Part 3, Section 3-334-27.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2787.1. Splices and Terminations of Metal-Clad Cable.
(a) Metal-clad cable splices or terminations shall be electrically and mechanically suitable for the conditions.
(b) Bonding shall be provided across splices to maintain the electrical continuity of the metal sheath.
(Title 24, Part 3, Section 3-110-14(c).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.















(Formerly Article 63)






s 2789. Scope.
This article applies to multi-conductor portable cables, size 8 AWG or larger.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.







s 2790. Use.
Cable supplying energy to mobile equipment or machinery shall be IPCEA Type SHD-GC or other approved portable type.
Exception: Portable-type cable is not required to supply mobile equipment that is not frequently moved, provided the cable is suitably protected and will not be moved while energized.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.







s 2791. Shielding.
All high-voltage portable cables shall be operated with grounded shielding.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.







s 2792. Grounding.
Connection of grounding conductors shall be in accordance with Article 6.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.







s 2793. Minimum Bending Radii.
The minimum bending radii for portable cables during installation and handling in service shall be adequate to prevent damage to the cable.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.







s 2794. Fittings.
Connectors used to connect lengths of cable in a run shall be of an approved type which lock firmly together. Provisions shall be made to prevent opening or closing these connectors while energized. Suitable means shall be used to eliminate tension at connectors and terminations.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.







s 2795. Splices and Terminations.
Flexible cables shall not be operated with splices unless the splices are of the permanent molded or vulcanized type. Terminations on high-voltage flexible cables shall be accessible only to authorized and qualified personnel.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.















(Formerly Article 64)






s 2797. Use.
During periods of construction, test, experiment, or emergencies, a less permanent class of wiring and equipment shall be permitted to be used than would be required for permanent installations.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.







s 2798. Guarding.
Suitable fencing, barriers, or other means shall be provided to prevent access of other than authorized and qualified personnel to temporary wiring.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.







s 2799. Time Limit.
(a) Temporary wiring as permitted in this section shall not be used for a period exceeding 90 days, except for construction purpose in which case it may be used for not to exceed one year. If necessary to exceed the above time limitation, special permission shall be obtained from the enforcing authority.
(b) All temporary wiring shall be removed immediately upon the completion of construction or purpose for which the wiring was installed; or upon the expiration of the time limit specified above.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.















(Formerly Article 65)






s 2801. Cable Suspended by Its Conductor(s).
When a cable is suspended by its conductor(s), the total suspended weight shall not be greater than one-seventh of the ultimate tensile strength of the supporting conductor(s). Cable supports shall be designed to carry adequately the weight of the cable.
Separate supports shall be provided for the sheath of unarmored lead-sheathed cable.
(Title 24, Part 3, Section 3-300-37(a).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2802. Cable Suspended by Wire or Messenger.
When a cable is suspended by wire armor or messenger, the totalsuspended weight shall not be greater than one-fifth of the ultimate tensile strength of the armor or messenger.
(Title 24, Part 3, Section 3-300-37(b).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2803. Wire Mesh Holding Devices.
When wire mesh mechanical holding devices are used, either as the sole means of support or in conjunction with other means of support, the total suspended weight on each device and the distance between devices shall not exceed recommendations of the cable and wire mesh manufacturers.
(Title 24, Part 3, Section 3-300-37(c).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.















(Formerly Article 66)






s 2805. Vaults -General.
(a) Strength. Vault structures shall have sufficient strength to withstand the loading to which they may be subjected and to support the equipment mounted therein.
(b) Wall Material. Vault interior walls shall be of assemblies of materials approved for not less than one-hour, non-combustible fire-resistive construction.
(c) Doors. Door openings to vaults shall be protected by approved one-hor rated fire door and frame assemblies.
(d) Ceiling Access. Vault ceiling access opening covers or grates weighing less than 100 pounds shall be securely fastened in place.Openings must be minimum of 26 inches diameter or 24 inches by 26 inches in size. Safe access shall be provided from the opening to the floor or other working surface.
(e) Ventilating Ducts. All ventilating flues or ducts shall be of noncombustible construction.
(f) Ventilating Openings. Ventilating openings shall not be through the vault door, except where door opens to outdoors.
(g) Adequate Ventilation. Vaults shall be provided with means for ventilation adequate to prevent equipment temperatures in excess of those at which the equipment may be safely operated.
(h) Drainage. Where drainage from sumps in vaults is to a sewage system, a suitable trap shall be installed capable of preventing the entrance of sewer gas into the vault.
(i) Foreign Pipes and Accessories. Pipelines such as sewer, water, gas, oil, etc., in as far as is practicable, shall be installed outside the vault enclosure unless they constitute an integral part of operation of the equipment installed in the vault. Where it is impracticable for such lines to be installed outside the vault, they shall contain no appurtenances (such as valves, faucets, or fittings) inside the vault that require maintenance.
(Title 24, Part 3, Section 3-110-35.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2806. Vaults Containing Oil-Filled Equipment.
Vaults containing oil-filled equipment shall conform to the following in addition to Section 2805:
(a) Construction. Walls, roofs, and floors (other than when laid on earth) shall be of assemblies of materials approved for three-hour non-combustible fire-resistive construction.
(b) Doors. Door openings to vaults shall be protected by approved three-hour rated fire doors and frame assemblies.
(c) Sills or Curbs. A door sill or curb of sufficient height to confine within the vault the oil from the largest oil-filled equipment shall be provided, and in no case shall the height be less than 4 inches.
(d) Ventilating Openings. Ventilating openings shall be located as far away as practicable from building doors, windows, fire escapes, and combustible material. All openings from vaults into buildings, except approved fire door openings and viewing ports, shall be connected to a non- combustible duct or flue leading directly to the exterior, or shall be equipped with approved three-hour rated fire doors or fire dampers.
(e) Vents. Ducts and flues shall not be connected with any other ventilating or air distribution system, except that ventilation may be supplied from conditioned air systems into the vault, provided approved three-hour rated fire doors or fire dampers are installed in each opening.
(f) Sprinkler Systems. Water-type fire sprinkler systems shall be prohibited.
(Title 24, Part 3, Section 3-110-36.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Labor Code.







s 2807. Separate Buildings.
Electrical equipment containing flammable gas or more than 10 gallons of flammable oil per unit shall not be installed indoors except in a vault or a separate building meeting the following requirements:
(a) Neither the building nor its contents present a fire hazard to any other building or property.
(b) The building is used only for supplying electrical service.
(c) The interior is accessible only to qualified persons.
(Title 24, Part 3, Section 3-110-38.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2808. Roof Installations.
Electrical equipment shall be permitted to be installed on the roof of a building, provided:
(a) The building structure has sufficient strength to support the entire installation.
(b) Where oil-insulated equipment is used, the roof shall be of two-hour, non-combustible fire resistive construction, and a curb high enough to contain the oil from the largest oil-filled equipment shall be provided. In no case shall the height of the curb be less than 6 inches. A drain shall be provided from the curbed enclosure to carry any oil which it may contain well away from the building.
(Title 24, Part 3, Section 3-110-39.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2809. Metal Enclosures.
No additional enclosure is required for equipment, provided (a) all energized parts and conductors are protected by metallic enclosures from accidental contact, and (b) such enclosures are bonded together and effectively grounded in accordance with Article 6.
(Title 24, Part 3, Section 3-110-40.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2810. Locked Rooms, Vaults, or Enclosures.
The entrances to enclosures containing exposed high-voltage energized parts shall be kept locked, except where such entrances are at all times under the observation of a qualified attendant. Access doors or gates to rooms, vaults, or fenced enclosures containing electrical equipment shall be readily opened from the inside without the use of a key.
(Title 24, Part 3, Section 3-110-34(c).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2811. Warning Signs.
Permanent and conspicuous warning signs shall be posted on all doors or gates that provide access to enclosures containing exposed energized parts and conductors. Such signs shall be legible at 12 feet and shall read substantially as follows:
"WARNING -HIGH VOLTAGE -KEEP OUT."

(Title 24, Part 3, Section 110-34(c).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2812. Fenced or Walled Enclosures.
(a) The height of enclosures shall be 8 feet minimum, or floor to ceiling if the ceiling is less than 8 feet.
Exception: The height of the enclosure shall be not less than 10 feet where any exposed energized part is more than 8 feet above the ground, unless the energized part is located more than 5 feet horizontally from the enclosure.
(b) The enclosure shall be so constructed that it cannot be readily climbed.
(c) The size and location of openings in fences or similar enclosures shall be such that persons are not liable to come into accidental contact with energized parts, or to bring conducting objects into contact with them.
(d) The gate or door in the enclosure shall have minimum dimensions of 2 feet 6 inches wide and 6 feet 6 inches high, and shall be readily operable. No reduction in enclosure height at the door or gate is permitted.
(e) Metal gates or doors shall be grounded or bonded to a grounded metal enclosure. Metal fences shall be grounded as required by Article 6.
(f) If buildings form a part of an enclosure, there shall be no unguarded doors or windows which permit unintentional access to the enclosure. Where the enclosure is adjacent to and below stairways, fire escapes, balconies, or windows, suitable guards shall be installed to prevent persons from making accidental contact with energized parts.
(g) Where oil-filled apparatus is installed within an enclosure adjacent to combustible material or combustible buildings, provision shall be made to confine within the enclosure the largest amount of oil contained in a single piece of apparatus.
(h) Pressure relief devices of oil-filled apparatus shall be designed and located to minimize the hazard to persons from escaping oil.
(i) Materials other than those required for operation of the facilities shall not be stored in vaults or fenced enclosures.
(Title 24, Part 3, Section 3-110-31(e)-(m).)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2813. Underground Vaults.
Manholes or underground rooms in which it may be necessary for persons to work shall comply with Division 4, Sections 8051 through 8057 of the California Public Utilities Code, which is hereby incorporated by reference. The following requirements relating to the minimum size of any manhole, subway, chamber, or underground room containing any electrical wiring or equipment are extracted from these statutes:
(a) The inside measurement shall be not less than 4 feet between the end walls and between the side walls thereof, or if circular in shape, not less than 4 feet in diameter inside measurement, and not less than 6 1/2 feet at all points between the floor and the top or ceiling.
(b) Any access opening to outer air shall be not less than 26 inches if circular in shape, or not less than 24 inches by 26 inches clear measurement if rectangular in shape.
(Title 24, Part 3, Section 3-110-37.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943, Health and Safety Code.















(Formerly Article 67)






s 2815. General.
Conductors shall have mechanical strength, insulation, and ampacity adequate for the particular conditions under which they are to be used. These provisions are not intended to apply to conductors which form an integral part of equipment, such as the windings of a motor, a motor controller, and the like, or which are provided for elsewhere in these regulations.




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.







s 2816. Insulation.
Conductors shall be insulated, except where uninsulated conductors are specifically permitted by these orders, and shall have a voltage rating not less than the operating voltage of the circuit.
(Title 24, Part 3, Section 3-310-2(a).)
(a) Wet Locations. Conductors installed in wet locations either above or below ground shall be moisture-resistant or of a type approved for use under wet conditions.
(Title 24, Part 3, Section 3-310-7.)
(b) Corrosive Conditions. Conductors exposed to oils, greases, vapors, gases, fumes, liquids, or other substances having a deleterious effect upon the conductor or the insulation shall be of a type approved for the use.
(Title 24, Part 3, Section 3-310-8.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2817. Conductors in Multiple.
Conductors in size 1/0 or larger shall be permitted to be run in multiple. Where conductors are run in multiple, they shall be so installed and terminated to prevent overloading of any conductor. Where conductors are run in multiple, the conductors shall be connected together at each end.
(Title 24, Part 3, Section 3-310-4.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2818. Neutral Conductors.
(a) Size. Neutral conductors shall be of sufficient size to carry the current to which they may be subjected.
(b) Insulation. The insulation level of neutral conductors of ungrounded systems shall be the same as that of the phase conductors of services, feeders, and branch circuits. For insulation levels of grounded conductors, see Article 6.
(Title 24, Part 3, Section 3-310-62.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2819. Conductor Terminations.
Where insulated conductors are terminated or spliced, suitable terminations or stress cones shall be installed unless other effective means are used to reduce voltage stress. The metallic shielding or any other voltage shields on cables shall be stripped back to a safe distance according to the circuit voltage, at all terminations of the shielding, as in potheads and joints.
(Title 24, Part 3, Section 3-710-6.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2820. Grounding of Shielding.
Metallic shielding tape shall be grounded in accordance with Article 6.
(Title 24, Part 3, Section 3-710-6.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2821. Ampacities.
The ampacities of conductors shall be as shown in IPCEA Publication No. P46- 426, Volumes I and II, "Power Cable Ampacities," published September 1, 1966 by the Insulated Power Cable Engineers Association, which is hereby incorporated by reference.
(Title 24, Part 3, Section 310-15.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.















(Formerly Article 68)






s 2823. General.
(a) Scope. The requirements of this article shall apply to electrical equipment or exposed wiring run between buildings or structures. Equipment and wiring for service entrance conductors shall comply with Article 4. Equipment and wiring located in flammable atmospheres shall comply with Article 34.
Section V, General Order No. 95, 1981 Edition, Rules for Overhead Electric Line Construction of the California Public Utilities Commission, which is hereby incorporated by reference, shall be complied with in all features of line construction employed in outside wiring, except as modified by this article.
Section III, General Order No. 128, 1974 Edition, Rules for Construction of Underground Electric Supply and Communication Systems of the California Public Utilities Commission, which is hereby incorporated by reference, shall be complied with in all features of underground construction employed in outside wiring, except as modified by this article.
(Title 24, Part 3, Section 3-710-81.)
(b) Wiring Methods. Exposed outside wiring shall be permitted to be installed as:
(1) multiple conductor cable suitable for the purpose, or
(2) bare, covered, or insulated conductors in insulating supports suitably protected by isolation, screening, or guarding.
(Title 24, Part 3, Section 3-710-82.)
(c) Conductors. Overhead conductors shall conform to the requirements of Article 18.
(Title 24, Part 3, Section 3-710-83.)




Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.







s 2824. Overhead Lines.
(a) Supports. Open conductors shall be supported on insulators of sufficient mechanical and dielectric strength for the application. (continued)