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Old 03-08-2015, 12:56 AM   #1
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Practical considerations for UF


I have UF wire running to my detached garage. On the house side, it enters metal conduit at the point it leaves the dirt, then connects to breaker box. The end of the metal conduit is simply cut off a couple inches below the dirt. Is this how it's supposed to be?

Last edited by halliwellc; 03-08-2015 at 12:58 AM. Reason: clarity
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Old 03-08-2015, 01:12 AM   #2
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no. Being cut off isn't the problem. Being cut off so close to the surface is the problem. It needs to be protected by conduit any time it is less than 24" below the surface.

I also prefer to install a push on plastic bushing to make sure the conduit cannot cut the wire.
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Old 03-08-2015, 07:04 AM   #3
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Metal conduit should not float above ground with live conducts within. Often times conduit of some sort is used for protection of the wires or cable against physical damage. Non metallic is best for that, but if metal conduit is used it has to be bonded. So I see that as a problem here also.
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Old 03-08-2015, 08:17 AM   #4
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Quote:
Originally Posted by sparky90 View Post
Metal conduit should not float above ground with live conducts within. Often times conduit of some sort is used for protection of the wires or cable against physical damage. Non metallic is best for that, but if metal conduit is used it has to be bonded. So I see that as a problem here also.
NEC reference please.
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Old 03-08-2015, 08:21 AM   #5
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The OP says the conduit connects to the panel so it is already bonded.
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Old 03-08-2015, 11:05 AM   #6
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Quote:
Originally Posted by brric View Post
NEC reference please.
Not bonding in this situation may be OK under an exception of it being used as a wire protection. Guess its OK then. If it gets energized it could be a problem though. Hopefully it won't.
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Old 03-08-2015, 02:06 PM   #7
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a correction to my input:

the protection is only required to extend to no less than 18" below grade per 300.5(D)(1)

also, per 300.5(D)(4) if the raceway (conduit) is subject to damage (like in where a lawnmower might throw sticks or stones and hit it) RMC, IMC, schedule 80 pvc or equivalent must be used.

and a bushing MUST be used (per 300.5(H))



and with brric's prompting:

per 300.10 exc 1; short sections of raceways used to provide support or protection of cable assemblies from physical damage shall not be required to be made electrically continuous.
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