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Old 05-15-2012, 11:11 AM   #1
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Default Underground PVC Sag

Were doing an underground 600 amp service in 2" pvc this week. The boss says just to run the pvc and pull the conductors then 90 up and into the LB's and were done. Wouldn't that SAG over time without some sort of expansion coupling or method to keep it from pulling away from house over time? He said the glue and mineralac will keep it from pulling down even if soil sags under conduit. Is he right ?
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Old 05-15-2012, 11:14 AM   #2
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I think he is mistaken


Quote:
300.5(J) Earth Movement. Where direct-buried conductors,
raceways, or cables are subject to movement by settlement
or frost, direct-buried conductors, raceways, or cables shall
be arranged so as to prevent damage to the enclosed conductors
or to equipment connected to the raceways.


Informational Note: This section recognizes “S” loops in
underground direct burial to raceway transitions, expansion
fittings in raceway risers to fixed equipment, and, generally,
the provision of flexible connections to equipment subject
to settlement or frost heaves.
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Old 05-15-2012, 11:15 AM   #3
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some do, some don't. depends on the drainage and soil conditions I guess.

bob - how much frost you think they get in Alabama ?
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Old 05-15-2012, 11:18 AM   #4
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Quote:
Originally Posted by wildleg View Post
bob - how much frost you think they get in Alabama ?
Damn little, they still have ground movement from settling.
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Old 05-15-2012, 11:19 AM   #5
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Quote:
Where direct-buried conductors,
raceways, or cables are subject to movement by settlement
or frost,
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Old 05-15-2012, 12:01 PM   #6
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What about a (600) amp. service using 2"PVC.. how does that work..
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Old 05-15-2012, 12:05 PM   #7
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2 sets of 350, or maybe 300 (cu). I figured he had 2 pipes ? oops , I guess not. hmmm, interesting question. must have 3 pipes - 3 sets 3/0 ? that's weird.
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Old 05-15-2012, 12:32 PM   #8
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3 runs sounds like a whole lot of extra work for nothing......wonder if the boss checked the POCO ct specs and has the right lugs ordered for the main
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Old 05-15-2012, 01:14 PM   #9
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3 200 amp panels individually fed from a remote meter ? Wow
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Old 05-15-2012, 01:43 PM   #10
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I think we now know why his boss thinks this is ok......maybe a phone and cable feed thrown in for good measure...
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