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E4203.7 Underground Wiring
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Underground wiring shall not be installed under or within the area extending 5 feet (1524 mm) horizontally from the inside walls of pools and outdoor hot tubs and spas except where the wiring is installed to supply pool, spa or hot tub equipment or where space limitations prevent wiring from being routed 5 feet (1524 mm) or more horizontally from the inside walls. Where installed within 5 feet (1524 mm) of the inside walls, the wiring method shall be a complete raceway system of rigid metal conduit, intermediate metal conduit or a nonmetallic raceway system. Metal conduit shall be corrosion resistant and suitable for the location. The minimum cover depth shall be in accordance with Table E4203.7.
TABLE E4203.7
MINIMUM BURIAL DEPTHS
| WIRING METHOD | UNDERGROUND WIRING (inches) |
| Rigid metal conduit | 6 |
| Intermediate metal conduit | 6 |
| Nonmetallic raceways listed for direct burial and under concrete exterior slab not less than 4 inches in thickness and extending not less than 6 inches (162 mm) beyond the underground installation | 6 |
| Nonmetallic raceways listed for direct burial without concrete encasement | 18 |
| Other approved racewaysa | 18 |
For SI: 1 inch = 25.4 mm.
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