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Old 08-21-2011, 01:27 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, 06:56 AM   #2
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Interpretation required - trench depth


Either way will do.

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Old 08-21-2011, 07:50 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, 08:31 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, 09:34 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, 04:08 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, 05:13 PM   #7
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Interpretation required - trench depth


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Originally Posted by bleedpurple View Post
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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