How deep should electrical wire be buried?

36 inches Direct buried cables or cables in flexible nonmetallic enclosures shall be installed at a depth of at least 36 inches.

dir.ca.gov - California Code of Regulations, Title 8, Section 2830. Insulated Conductors.

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This information is provided free of charge by the Department of Industrial Relations from its web site at www.dir.ca.gov . These regulations are for the convenience of the user and no representation or warranty is made that the information is current or accurate. See full disclaimer at https://www.dir.ca.gov/od_pub/disclaimer.html

Subchapter 5. Electrical Safety Orders

Group 2. High-Voltage Electrical Safety Orders

Article 19. Outdoor Wiring (Formerly Article 68)

§2830. Insulated Conductors.

(a) General. Insulated cables shall be of a type suitable for the voltage and service conditions. All cables installed underground shall have a grounded metallic sheath, shield, or a bare concentric grounded conductor, or shall be installed in grounded metallic conduit.

(Title 24, Part 3, Section 3-710-88(a).)

(b) Cable Installed in Buildings. Where installed in buildings, cables energized above 35,000 volts shall be encased in at least 3 inches of concrete or equivalent fire-resistant material.

(Title 24, Part 3, Section 3-710-88(c).)

(c) Direct Buried Cables. Direct buried cables or cables in flexible nonmetallic enclosures shall be installed at a depth of at least 36 inches. Lesser depths shall be permitted to be employed if the cable is armored with a minimum of No. 12 BWG steel wire closely wound or two layers of steel tape each at least 0.020 inch thick, or if the cable is protected by a layer of concrete at least 3 inches thick above the cable. EXCEPTION: Lesser depths than those listed are permitted where cables rise for terminations and splices or where access is otherwise required.

(Title 24, Part 3, Section 3-710-88(c).)

(d) Identification. Cables shall be labeled at all circuit terminals, sectionalizing points, vaults, rooms, etc. The labels shall, as a minimum, show phase and circuit designation and nearest sectionalizing points.

(1) Changes in labeling shall be made concurrently with changes in circuit.

(Title 24, Part 3, Section 3-710-88(d).)

(e) Neutral Conductor. The size and insulation of neutral conductors shall be in accordance with Section 2818.

(Title 24, Part 3, Section 3-710-88(e).)

(f) Shielding. All cables normally operated above 5,000 volts shall have insulation shielding, except that shielding shall not be required for series street lighting circuits operating at less than 7,500 volts. Metallic shielding at terminations shall be effectively grounded. If shielding is sectionalized, each section shall be effectively grounded.

(Title 24, Part 3, Section 3-310-61.)

(g) Terminations. Cable terminations shall be suitable for the voltage and service conditions.

(Title 24, Part 3, Section 3-710-3(c).)

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

HISTORY

1. Editorial correction filed 11-2-83 (Register 83, No. 45).

2. Editorial correction of subsection (e) filed 11-3-83 (Register 83, No. 45).

3. Amendment filed 12-10-87; operative 1-9-88 (Register 88, No. 1).

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