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Service fused disconnect to xfmr

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curious101

Senior Member
Location
Atlanta, GA, USA
Hi,
Retail application. Question regarding neutral from 480v fused service disconnect to downstream transformer (480V side of 480V to 208/120V xfmr). Do I need to provide neutral? Thank you!
 
infinity

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
curious101 said:
Hi,
Retail application. Question regarding neutral from 480v fused service disconnect to downstream transformer (480V side of 480V to 208/120V xfmr). Do I need to provide neutral? Thank you!
Click to expand...
Even if you ran a neutral for the primary with a standard delta/wye transformer there would be nothing to connect it to.
 
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wwhitney

Senior Member
Location
Berkeley, CA
Occupation
Retired
curious101 said:
Thank you! How about from the fused service disconnect upstream to utility transformer? Do I need a neutral there or is it per utility company? Thanks!
Click to expand...
From the utility service point to the service disconnect you must run a neutral, because it is part of the fault clearing path and the Main Bonding Jumper to it is used to create the EGC system downstream of the service disconnect.

Cheers, Wayne
 
C

curious101

Senior Member
Location
Atlanta, GA, USA
wwhitney said:
From the utility service point to the service disconnect you must run a neutral, because it is part of the fault clearing path and the Main Bonding Jumper to it is used to create the EGC system downstream of the service disconnect.

Cheers, Wayne
Click to expand...
Thank you! And I don’t run ground from utility xfmr secondary to my fused service disconnect switch, but run ground from my fused service disconnect to downstream 480 to 208/120 xfmr, correct? Thank you!
 
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