Stationary & portable generator with ATS & separate service breaker

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housemoney

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I have not seen an arrangement like this in some time and am scratching my head a bit. Please see image below- My plans show a "service breaker" in it's own enclosure (circled blue) between the utility meter socket and a non-service entrance rated ATS. The pad mounted generator is shown to be grounded as a non separately derived system as the ATS does not switch the neutral.

Also, a portable generator receptacle is to be installed on side of the outdoor control panel (plans showed 3W but it's 4W with neutral). This feeder connects in parallel with the Main/ATS feeder within the control panel on interlocked breakers.

Can anyone help identify if the main bonding jumper is shown in the correct location (in the control panel only), or if there are any code issues here I should take note of (particularly grounding & bonding) before I get too far into this one?


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hillbilly1 said:
The main bonding should be up at the service disconnect, not on the load side of the transferswitch regardless if it is an sds or non sds
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I think that’s where my confusion was coming from, have installed many service disconnects ahead of non-SE rated ATS’s but couldn’t think of one where I had bonded the neutral downstream of it.

Anymore it seems like it this would’ve been more straight forward & just as cost efficient to have the portable generator plug on a SE rated transfer switch, and had the main & generator breakers installed within it, done all the bonding there? Not sure what the goal was on this one.
 
Looks like they are using a redundant portable in case the permanent generator fails. Since it is a three pole ATS, and three pole manual switch, that means both generators would be non-sds, so no neutral/ground bonding on either, only bond will be at the service disconnect.
 
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