sdbmania wrote: ↑
Wed Mar 24, 2021 3:40 pm
I tried getting one but it's not working. It has a green cable coming out of it that is supposed to be for ground, but I thought the EVSE didn't need a grounding wire. If anyone could give me a recommendation on what kind of adapter I should get, I need a 10-30 to 14-50, I would appreciate it.
The EVSE does need an EGC, it just doesn't need a neutral. 10-30 is an ungrounded pattern, 2 hots and a neutral, while 14-50 is a grounded pattern, 2 hots, a neutral and an EGC. So your adapter is attempting to handle the general purpose case, where you can use the green wire to run to a properly grounded receptacle for an EGC. The EVSE is doing an EGC check, finding out there is none, and flashing its light as an error.
You will also find adapters marketed as for EVSEs that don't have the green wire. They will internally connect the 14-50 EGC to the 10-30 neutral. Which is a bit of a kludge, and potentially problematic if you used them for a 120V/240V load, rather than a straight 240V like an EVSE.
Since you have a 10-30 receptacle instead of a 14-30 receptacle, your dryer installation is on the old side. That would definitely give me pause about using an adapter in the long run, as I would not have confidence that the circuit didn't have unknown deficiencies. The prudent thing to do if you don't want to run a new circuit would be to get a 24 amp EVSE, preferably with a 6-30 plug, and have an electrician come out, inspect both ends of the circuit, and change the 10-30 receptacle to a 6-30 receptacle.
This entire discussion assumes the 10-30 receptacle is not currently used. If it's used by a dryer, forget it and run a new circuit.