tom vondrasek

06:22PM | 04/17/03
Member Since: 04/16/03
2 lifetime posts
What is the accepted NEC code for depth of conduit under concrete? I've been told both 18" and "it doesn't matter - it's under concrete". I'm running a separate 125A service connection box from the main house panel for a small work shop I want to build. Everything that is not under concrete will be 18" but the pipe already exists under the driveway and I can use it it saves $$$.


11:30AM | 04/18/03
Member Since: 08/30/02
32 lifetime posts
Tom - you have not given enough information to give you a correct answer.
Table 300-5 (both 1999 & 2002 NEC) give the required burial depths for a variety of installation situations...e.g. will your conductor being running under your driveway?, are you using direct burial cable?, how thick is the concrete? (yes it makes a difference)....depending on a variety of factors you may have to go as deep as 24" or as shallow as 4".

tom vondrasek

02:00PM | 04/18/03
Member Since: 04/16/03
2 lifetime posts
Thanks, There is a 1 1/2" PVC pipe buried 4" under the driveway. The driveway is a standard 4" thickness. I'll run a simple 220V circuit with a nuetral and a ground. There will be a separate breaker in the main house panel for the sub panel.
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