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(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).)
(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.
1. Editorial correction including renumbering of former Article 59 to Article 10 filed 11-2-83 (Register 83, No. 45).
2. Editorial correction of subsection (a) filed 11-2-83 (Register 83, No. 45). 3. Amendment filed 12-10-87; operative 1-9-88 (Register 88, No. 1).