I know we have all beat the brakes off this discussion - however please stick with me. It will be entertaining at the very least. Also mods if this thread is in the wrong place, please move it to the right place. I didn't really see a section of the forum that covers my question / line of discussion.
I have a LISTED auto transformer that is designed to be connected to the grid and then automatically switch over to off-grid / genset / etc when the grid goes down. Now this AT was designed with the explicit intent of being connected to the grid and was listed as such.
The question is about neutral bonding. Should I be bonding the neutral / should I not be bonding the neutral. I have asked around locally and nobody really can give me a non-circular answer.
Auto Transformers are covered in a couple places in the NEC.
210.9 Circuits Derived From Autotransformers
Branch circuits shall not be derived from autotransformers unless the circuit supplied has a grounded conductor that is electrically connected to a grounded conductor of the system supplying the autotransformer.
I read this as - if you have branch circuits coming off the AT - one must use a common ground.
215.11 Circuits Derived From Autotransformers
Feeders shall not be derived from autotransformers unless the system supplied has a grounded conductor that is electrically connected to a grounded conductor of the system supplying the autotransformer.
I read this as - if you need to use the output of an AT as a feeder - it must use a common ground.
So this brings me to my question - should that common ground be bonded in my split phase panel or not? See the image below.
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