ECN Forum Forums General Topics of the Trade General Discussion Area burial depth for branch line?

Does anyone know the underground depth required by NEC for branch line? It is about a 100' run to a pole building 100 amp service. 220v...? thanks

You would need to provide the following info: voltage, what is it being buried under, wiring method etc.

Your burial depth does depend on if you're using conduit, or direct burial cable. The answer comes from Table 300-5. Assuming we are NOT going under a street, roadway, driveway but merely across a yard. Rigid conduit = 6", direct bury cable = 24", UF = 18". If your conditions are different, let us know.