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Underground service question

CEC 
4K views 23 replies 8 participants last post by  joe-nwt 
#1 ·
I'm running ACWU90 4/0 aluminum wire from my meterbase to the pole. I was told I need to use two ground bushings. Does this mean I need a threaded metal service head? Or can I screw my teck connector into a threaded PVC service head and only use a ground bushing at the meterbase end!
What is typical practice when using ACWU90 from the meterbase to the pole?

Thanks,
 
#4 ·
I know I cant solve this internet! I have this topic
Open with our local Safety inspector. I was just looking
For some input while I wait for him to get back to me. This will be the first service I have done with an armoured teck like cable.
I just wanted to hear what other electricians have done
In when using this type of wire. I understand that each
Situation is different depending on the authority at hand

Thanks,
 
#5 ·
I know I cant solve this internet! I have this topic

Open with our local Safety inspector. I was just looking

For some input while I wait for him to get back to me. This will be the first service I have done with an armoured teck like cable.

I just wanted to hear what other electricians have done

In when using this type of wire. I understand that each

Situation is different depending on the authority at hand



Thanks,
Please fill out your profile. No one will reply until that is done

Sent from my Samsung using Tapatalk
 
#8 ·
I’ve never used ACWU for a service but doesn’t it come with a bond conductor? Maybe the second ground bushing would be for the bond conductor at the service end?
And if you change over to a PVC service head, what do you do with the bond wire?
 
#11 ·
Even where you use a metallic head where would you bond to? I've used a teck connector and a threaded head. Still nothing to bond to. Is there another way to do this?
 
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#14 ·
I have seen people bond both sides of the metal nipple running between the meter and the main panel.

That is now making three parallel paths. Perfectly safe and code compliant. That’s why I tell the people not to worry about the neutral bonded to the ground in portable generators connected to a house.
 
#15 ·
I have seen people bond both sides of the metal nipple running between the meter and the main panel.

That is now making three parallel paths. Perfectly safe and code compliant. That’️s why I tell the people not to worry about the neutral bonded to the ground in portable generators connected to a house.
Yes there are parallel paths but they all lead to the one spot where the neutral and bonds meet. Any fault will be able to make its way back to the source.

When you have two separate sources of power, like a generator and the utility power, they should be isolated so faults can easily make their way back to the right source.
 
#20 ·
I'm ordering a threaded PVC service head on Monday with the proper Connectors. I will order one ground bushing for at the Meter base end.

I will leave a foot of the bond wire in the service head like Joe-nwt does.

It has been a while but I believe the service head will have mounting hols for screws. I will mount it with screws and use cable clamps for the armored cable.

I will add pole protection from the ground up with a U GUARD STEEL 2" X 10' FLANGED H-EMC-51-2X-2"X10FT shield.
Am I missing anything? Any thing else recommended?

Thanks,
 
#22 ·
The cable is for exposed and concealed wiring in dry or wet locations and where exposed to the weather. They are marked "sunlight resistant "
For use in ventilated and non ventilated and ladder type cable trays in wet and dry locations.
For direct earth burial.
For service entrance above or below ground.
For use in hazardous locations.
Minimum recommended installation temperature minus 40C .
Maximum conductor temperature 90C
Rated 600V
 
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