single phase transformer

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hhsting

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I have 277V to 120V, 2kVA, single phase transformer. I have provided the grounding electrode conductor to grounding electrodes however, I am wondering if it requires neutral to ground i.e. system bonding jumper NEC 2014 250.30?
 
Based on 250.21(B) I would say "yes" but more detail might be warranted.
 
I can not think of a reason for there not to be a bonding jumper looking at 450.6 & 250.20
 
hhsting said:
I have 277V to 120V, 2kVA, single phase transformer. I have provided the grounding electrode conductor to grounding electrodes however, I am wondering if it requires neutral to ground i.e. system bonding jumper NEC 2014 250.30?
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Yes, you will need to make this a grounded system. If it is straight 120 volt ground one end of the secondary winding. You will have the full 3 KVA output at 120 volt. If this is a 120/240 unit you could ground the mid point but you will only get 1/2 the output on each leg.
One advantage if it is straight 120 volt or (you connect it that way) is you could possibly omit secondary protection.
 
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