Control Low voltage tranformer grounding/bonding

[brother]

Im seen it both done and not done. So Im curious do most of you 'ground' the secondary of the low voltage transformer, (low meaning 24 volts or 120 volts) . Example being a 120 primary 24 volt secondary.

In some MCC s and contactors I see alot of the 480 primary and 120 secondary control transformers, and some of them are grounded/bonded on the secondary and some of them are not. Normally when its grounded/bonded on the secondary its the X2. I havent checked the code completely on the 24 volt issue, but it seems to be good practice to ground the secondaries. What do you do, and What do you think??

 

[Pierre C Belarge]

Take a peek at 250.20(A), this may help.

 

[benaround]

Brother,

If it is a 480-120v transformer I ground them from X2 to enclosure. If it is 250v or less to

24vac transformer I won't.

 

[brother]

Brother,

If it is a 480-120v transformer I ground them from X2 to enclosure. If it is 250v or less to

24vac transformer I won't.

what about the article Pierre C Belarge just quoted 250.20(A),?? it seems it would be required even on the 250v or less to 24 vac.

 

[benaround]

what about the article Pierre C Belarge just quoted 250.20(A),?? it seems it would be required even on the 250v or less to 24 vac.

Brother,

250.20A, if it exceeds 150v to ground, 250v or less would not exceed 150v to ground.