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Old 08-06-2013, 04:01 AM   #1
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Default Subject to physical damage?

what defines this? 300.5 (d)4 says conductors that are subject to physical damage shall be installed in sched 80 pvc, etc.

i am having a house built where there is no jurisdiction do inspections. the EC is installing sched 40 where direct burial conductors emerge. i always install sched 80. isn't the side of my house where mowers and weed eaters will be passing by considered "subject to physical damage"? i am pretty sure it is, but please, correct me if i'm wrong.
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Old 08-06-2013, 04:09 AM   #2
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It's open to interpretation. Since there is no inspection its up to the installer.
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Old 08-06-2013, 04:55 AM   #3
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That conductors are sleeved at all rates five stars here Books

and inasmuch as sch80 is lauded as the new physical damage fix in art 300 , methinks one could run either 80 OR 40 over with a tank...


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Old 08-06-2013, 05:38 AM   #4
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Sched 40 will offer good protection from the scenerios you mentioned.
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Old 08-06-2013, 04:10 PM   #5
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It's just one of the many vague phrases use in the NEC.

If you are going to effectively write law, you need to take out interpretation.
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Old 08-06-2013, 07:27 PM   #6
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I think if sch 40 straped as required you will not have any issues with general wiring. Now service entrance conductors I do sleeve with 80.
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Old 08-06-2013, 08:24 PM   #7
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Install some SEU cable and call it a day.
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Old 08-06-2013, 08:28 PM   #8
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I dont think you can use seu for direct burial. SEU on the exterior of a home here is required to be sleeved for protection from physical damage.
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Old 08-06-2013, 08:29 PM   #9
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There is no definition in the code book for "subject to physical damage". It is basically up to the AHJ. What pisses me off is that I can't find anywhere to get couplings and whatnot that is schedule 80, and that is usually where PVC breaks. Kinda defeats the whole purpose if you ask me.

ETA: When stubbing up out of the ground I always use Schedule 80 or RMC either to the meter, disco, or whatever, and for the first 10 feet going up a pole. If it is on the edge of a parking lot or what have you, then it is in rigid.
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Old 08-06-2013, 08:30 PM   #10
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I have only seen sch 80 elbows, that it. It gives the inspector a warm fuzzy feeling inside, kinda like RMC.
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Old 08-06-2013, 08:31 PM   #11
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Quote:
Originally Posted by mbednarik View Post
I dont think you can use seu for direct burial. SEU on the exterior of a home here is required to be sleeved for protection from physical damage.
I was being facetious. There's a five-dollar word. My bad.
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