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#34588 - 02/16/04 02:03 PM control transformer
jbfan Offline
Member

Registered: 02/21/03
Posts: 75
Loc: Newnan, GA
Do I need to bond the neutral of a 208v to 120v control transformer. The panel that feeds the transformer has the ground and neutral bonded inside the panel. It is a 500va transformer.

Thanks
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#34589 - 02/16/04 02:30 PM Re: control transformer
golf junkie Offline
Member

Registered: 04/22/01
Posts: 511
Loc: York, NE
No, You can bond it or let it float at your option. I prefer to bond it...it makes voltage reading to ground more meaningful, makes troubleshooting easier.

GJ

[This message has been edited by golf junkie (edited 02-16-2004).]

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#34590 - 02/16/04 03:53 PM Re: control transformer
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Please consider grounding the 120V-secondary winding. For 1000VA-and-under control-power transformers, NEC 250-30 allows the winding to be grounded with a simple 'case' jumper. The usual full-tilt grounding-electrode/building-steel connection is not needed. This is a real easy way to keep electrostatically-induced garbage off the control circuit.




[This message has been edited by Bjarney (edited 02-16-2004).]

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#34591 - 02/16/04 04:53 PM Re: control transformer
jbfan Offline
Member

Registered: 02/21/03
Posts: 75
Loc: Newnan, GA
Thanks for the answers. It will be bonded tomorrow!
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#34592 - 02/16/04 06:19 PM Re: control transformer
Scott35 Offline

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Registered: 10/19/00
Posts: 2724
Loc: Anaheim, CA. USA
I second Bjarney's suggestion!



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