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Nec Underground Cover: below 2in concrete
NEC (NFPA 70) Table 300.5 — minimum burial cover depths for underground wiring installations by location type and wiring method (direct burial cable, rigid metal conduit/IMC, nonmetallic raceway, residential GFCI branch circuit, irrigation at 30 V or less)
| location id | col1 direct burial mm (mm) | col2 rmc imc mm (mm) | col3 nonmetallic raceway mm (mm) | col4 residential gfci mm (mm) | col5 irrigation 30v mm (mm) | location description | nec section | standard |
|---|---|---|---|---|---|---|---|---|
| below 2in concrete | 450 | 150 | 300 | 150 | 150 | In trench below 50 mm (2 in.) thick concrete or equivalent | 300.5 | NEC (NFPA 70) 2017 Table 300.5 |
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