Residential Hardwired EV Charging Stations

[JamesPariseau]

240v 50amp 3 wire GFCI Disconnect in Garage to Hardwired 240v 3 wire car charging system

No Neutral Required.

GFCI breaker should work without neutral if ground bar and neutral bar are bonded? correct?

Even if we run a neutral to the disconnect, isn't it redundant since there is no load to create imbalance that the GFCI essentially protects?

 

[wwhitney]

Yes and yes.

Cheers, Wayne

 

[infinity]

GFCI breaker should work without neutral if ground bar and neutral bar are bonded? correct?

Where is this connection located?

 

[retirede]

240v 50amp 3 wire GFCI Disconnect in Garage to Hardwired 240v 3 wire car charging system

No Neutral Required.

GFCI breaker should work without neutral if ground bar and neutral bar are bonded? correct?

Even if we run a neutral to the disconnect, isn't it redundant since there is no load to create imbalance that the GFCI essentially protects?

The imbalance detected would be from line to EGC or other object that is bonded to the grounding system. The GFCI function is not affected by lack of a downstream neutral.

 

[JoeNorm]

Do you need a GFCI breaker if it is hardwired?

 

[retirede]

Do you need a GFCI breaker if it is hardwired?

It depends on the code cycle and location of the outlet.

 

[RustyShackleford]

It depends on the code cycle and location of the outlet.

What outlet ? It's hardwired. Anyhow, an EVSE is basically just a glorified GFCI, along with some handshaking logic (so the car and EVSE can agree on how many amps will be supplied).

 

[LarryFine]

What outlet ? It's hardwired.

Oh, are you gonna get it now!

Not all outlets are receptacle outlets.

 

[RustyShackleford]

Oh, are you gonna get it now!

Not all outlets are receptacle outlets.

I'm no fancy big-city electrician, just a simple working engineer.

 

[wwhitney]

What outlet ? It's hardwired.

See the Article 100 definition of outlet.

Anyhow, an EVSE is basically just a glorified GFCI

It's not a GFCI, the trip level is not 4-6 ma. It's akin to GFPE, the term in the standard is CCID20 for a 20ma trip threshold.

Cheers, Wayne

 

[RustyShackleford]

Ah, I stand corrected, thanks for the info. Similar idea as GFCI though, no ?

 

[Little Bill]

The imbalance detected would be from line to EGC or other object that is bonded to the grounding system. The GFCI function is not affected by lack of a downstream neutral.

I believe it's mainly looking for imbalance between L-L if no neutral. It couldn't detect between line and EGC since the EGC does not connect to the GFCI and does not normally carry current.

 

[retirede]

What outlet ? It's hardwired. Anyhow, an EVSE is basically just a glorified GFCI, along with some handshaking logic (so the car and EVSE can agree on how many amps will be supplied).

This is why engineers ( like me) shouldn’t be wiring up stuff!