Rigid Metallic conduit direct Burial PVC change over

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highvolts582

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brick nj
If I install RMC under ground and before I emerge from grade change to pvc is this ok as long as the RMC is completely buried in the whole run and a separate equipment ground is run to the equipment? I am going to be running rmc for a hot tub due to a tree the customer loves and i do not have much choice to dig nearby. my inspector said he would except the 6 inch deep rule. If not I was thinking direct burial pipe clamps on both sides and bonding it. I dont know why I am under the impression that if its all buried and separate equipment ground run its OK.
 
The metallic conduit must be bonded. See 250.86. There is an exception for metal elbows that are at least 18" below grade or encased in at least 2" of concrete. There are no exceptions for other than elbows that I am aware of.
 
thank you

thank you

don_resqcapt19 said:
The metallic conduit must be bonded. See 250.86. There is an exception for metal elbows that are at least 18" below grade or encased in at least 2" of concrete. There are no exceptions for other than elbows that I am aware of.
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Thanks for getting back to me I knew there was something about a 90 degree. Don't worry world I have never run rigid metal conduit unbonded ever I've run a lot of rigid and threading and such just never underground. Do you think there is any thing against bonding it with #6 and a direct burial pipe clamp. I'm going to change over to liquid tight after emerging from grade I have always run PVC for a hot tub but this is a save the giant tree thing. Im looking forward to not digging as deep. This all leads me to my next question as long as there is a bonding bushing is it ok to terminate the metal male connector to a plastic box?
 
highvolts582 said:
If I install RMC under ground and before I emerge from grade change to pvc is this ok as long as the RMC is completely buried in the whole run and a separate equipment ground is run to the equipment? I am going to be running rmc for a hot tub due to a tree the customer loves and i do not have much choice to dig nearby. my inspector said he would except the 6 inch deep rule. If not I was thinking direct burial pipe clamps on both sides and bonding it. I dont know why I am under the impression that if its all buried and separate equipment ground run its OK.
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instead of burying pipe clamps, run GRC all the way to one end or the other, and use a ground bushing on that end,
pull a ground wire, and be done with it.

so it stays there and doesn't rust away, you gonna tape it up with scotchwrap?

i've had duct banks that crossed other duct banks, and had to go over the top,
and get within 6" of roadway, and the solution was to use GRC, build the 27 3"
pipes as 4 point saddles, with unistrut racking, outside the ditch, and then lower
the entire thing in the ditch with a crane, hanging it off running thread with strut
across the ditch, and pouring 2,500# concrete over it, encasing it with 2" on all sides,
then remove the strut across the top and cut off the running thread below grade, and patch it.

it was pvc on both sides, and there wasn't any bonding done to it, as it was encased
and not accessible.
 
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