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Operation using NEMA 5-15

I recently obtained the 40A Advanced Kit. Using a NEMA 5-15 to 14-50 adapter wired for EVs, I turned on the EVSE which while going through its initial checks, failed to find proper Ground.

I realize now that the Packard relay operates with the 208-240 VAC input, so I presume this may be my problem. Unfortunately at the moment, I don't have access to a 240V NEMA 14-50 outlet, and I really need to operate the EVSE this way, temporarily.

I jumped the gun and obtained the Struthers Dunn relay before it was taken down from the store. And realize I need to replace the ferrule terminals to ring terminals on the AC input and J1772 cable.

So, 2 questions:

1. Should I be able to operate the 40A Advanced Kit EVSE using NEMA 5-15 adapter if I replace the Packard relay with the Struthers-Dunn relay?

2. If yes to the above, I will need to convert the ferrule terminals to ring terminals to connect the inputs to the relay. Any recommendations here?

Many thanks

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