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control transformer #34588 02/16/04 06:03 PM
Joined: Feb 2003
Posts: 69
J
jbfan Offline OP
Member
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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Re: control transformer #34589 02/16/04 06:30 PM
Joined: Apr 2001
Posts: 507
G
golf junkie Offline
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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).]

Re: control transformer #34590 02/16/04 07:53 PM
Joined: Apr 2002
Posts: 2,527
B
Bjarney Offline
Moderator
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).]

Re: control transformer #34591 02/16/04 08:53 PM
Joined: Feb 2003
Posts: 69
J
jbfan Offline OP
Member
Thanks for the answers. It will be bonded tomorrow!


"Yes I am a Pirate, 200 years to late" Jimmy Buffett
Re: control transformer #34592 02/16/04 10:19 PM
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Scott35 Online Happy
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I second Bjarney's suggestion!

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