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Old 08-21-2011, 12:27 AM   #1
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Interpretation required - trench depth


I'm allowed to run natural gas and electrical in the same trench according to the city as long as I comply to the following:

- Natural gas line must be at a minimum depth of 15"
- PVC conduit must be at a minimum depth of 18"
- 12" of separation required between the two

Does this mean I need to dig approximately 29" deep, run the PVC, backfill to around 15", run the gas line, and maintain the separation vertically then back fill again OR:

Dig a whole 18" deep, run the two parallel just a foot apart and maintain separation horizontally?

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Old 08-21-2011, 05:56 AM   #2
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Interpretation required - trench depth


Either way will do.

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Old 08-21-2011, 06:50 AM   #3
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Interpretation required - trench depth


I think they mean horizontally, but don't take my word for it, check with the local authority.
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Old 08-21-2011, 07:31 AM   #4
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Interpretation required - trench depth


Quote:
Originally Posted by n0c7 View Post
I'm allowed to run natural gas and electrical in the same trench according to the city as long as I comply to the following:

- Natural gas line must be at a minimum depth of 15"
- PVC conduit must be at a minimum depth of 18"
- 12" of separation required between the two

Does this mean I need to dig approximately 29" deep, run the PVC, backfill to around 15", run the gas line, and maintain the separation vertically then back fill again OR:

Dig a whole 18" deep, run the two parallel just a foot apart and maintain separation horizontally?
How come you are not asking them ?
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Old 08-21-2011, 08:34 AM   #5
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Interpretation required - trench depth


They don't know themselves. Gas guy says not my problem I need 15" ask the electrical guy. Electrical guy says he doesn't know ask the gas guy. I found the information digging myself.
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Old 08-21-2011, 03:08 PM   #6
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Interpretation required - trench depth


Think about the guy digging it up in the future. What would you want if you were the electrical guy? I'd want them separated horizontally so I don't have to expose the gas line to work on electrical. Separate them more than the minimum if you can since you really don't want to hit either accidentally.
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Old 08-21-2011, 04:13 PM   #7
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Interpretation required - trench depth


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Think about the guy digging it up in the future. What would you want if you were the electrical guy? I'd want them separated horizontally so I don't have to expose the gas line to work on electrical. Separate them more than the minimum if you can since you really don't want to hit either accidentally.
THAT is a common sense answer. If you already have the trencher....its really not that much more work to do two trenches.

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