2 transformers mounted on the same panel.

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raymonwa

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currently 480v is ran to a panel and mounted on the side of that panel their are (2) 480v to 120v transformers for control circuits. my question is do both transformers get bonded on their secondary side together? so in theory the ground wire of the 480v that supplies both transformers and the secondary side of both transformers neutral conductor and ground wire are all bonded? do the primary side ground wire need to be separated from the secondary side ground wire? ....im getting an interesting reading of 37volts from the 120v to ground in that 480v panel. and we are also getting some funky PLC communication problems which may be unrelated. Would someone be able to help me out on this please?

thanks
 
All the neutrals and grounding conductors in the building should be bonded to each other at some point(s)

See 250.30 for the rules requiring the neutral of those transformers to be bonded to ground.
 
raymonwa said:
currently 480v is ran to a panel and mounted on the side of that panel their are (2) 480v to 120v transformers for control circuits. my question is do both transformers get bonded on their secondary side together? so in theory the ground wire of the 480v that supplies both transformers and the secondary side of both transformers neutral conductor and ground wire are all bonded? do the primary side ground wire need to be separated from the secondary side ground wire? ....im getting an interesting reading of 37volts from the 120v to ground in that 480v panel. and we are also getting some funky PLC communication problems which may be unrelated. Would someone be able to help me out on this please?

thanks
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Yes they're all connected together so any voltage measurements between them should be at or near 0 volts.
 
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