Neutral bonding at Edison meter

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Scot h

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Riverside ca
Here’s my scenario, three wire three phase from Edison pole, no neutral.
My switchgear is a four wire application , I am feeding 1 main 3 wire 480v 400 amp panel, no neutral, do I still need to bond the neutral at main Edison gear?
 
Scot h said:
Here’s my scenario, three wire three phase from Edison pole, no neutral.
My switchgear is a four wire application , I am feeding 1 main 3 wire 480v 400 amp panel, no neutral, do I still need to bond the neutral at main Edison gear?
Click to expand...
I dont totally follow what is going on. Is the service ungrounded? Is it corner grounded? Not sure what "my switchgear is four wire application" means. Perhaps more detail would help.
 
Scot h said:
Here’s my scenario, three wire three phase from Edison pole, no neutral.
My switchgear is a four wire application , I am feeding 1 main 3 wire 480v 400 amp panel, no neutral, do I still need to bond the neutral at main Edison gear?
Click to expand...

My 2 cents ...

I'd think there would be a messenger or support cable that the 3 phases are twisted around as they come from the utility pole, If not and their simply 3 independent lines attaching to 3 separate insulators at the building then I suppose the system was not intended for a 277v return.

The thing I'd consider is if no utility return ( neutral ) is present I wouldn't be comfortable driving a rod to make one, It wouldn't be wise or even legal I presume to use the facility earth as a steady return for possibly 100 amps or more of 277v supply current .
 
tom baker said:
What is edison gear/pole
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Underground feed from Edison pole to Edison pull section, my main gear which is attached to pull section has four wire app, but my feed to new 400 amp panel is only a three wire panel, no neutral buss, this is for 3 phase loads only, Edison inspector wants me to bond neutral at gear, doesn’t make sense to me since we are not utilizing a neutral
 
Scot h said:
Edison inspector wants me to bond neutral at gear
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I'd just bond your switch gear to the various required electrodes, structural bonds, water / gas bonds etc .. and end it within appropriate section for neutral/ ground buss termination of the equipment, if they ever want to provide a neutral at some point the gear will be ready..
 
zbang said:
From the OP's location, I assume the PoCo is Southern California Edison.
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The location didn’t help me.

is the SE a 4 wire? Three phases and a grounded conductor. What is the voltage at the SE?

The panel you are feeding is three phase loads only. It requires an equipment grounding conductor. It does not require a grounded conductor. Where did you land the EG?
 
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