50 (42) > 40 =0

[wyreman]

I don't understand why
this UL listed EV charger
can be specd using a 50 amp receptacle
which allows 42 amp flow and
only be required to be protected
by 40 amp fuse
Am I my missing something?
Obviously!

 

[Smart $]

A 40A breaker is supposed to trip on a 42A continuous flow... :blink:

 

[infinity]

At least the 50 amp receptacle is OK. Where does it say that the load is 42 amps?

 

[Pharon]

Assuming the wiring is rated for 40A, I don't see any code violations here.

The max amps you'll probably see from this charger is 32. Why they're spec'ing a 50A receptacle instead of a 40A, I have no idea. But it is legal.

 

[kwired]

Why they're spec'ing a 50A receptacle instead of a 40A, I have no idea. But it is legal.

Because (NEMA) receptacle ratings are usually only 15, 20, 30, 50 and 60 amps.

 

[Pharon]

Because (NEMA) receptacle ratings are usually only 15, 20, 30, 50 and 60 amps.

Ah. Well that explains it then. I'm just stupid.

 

[Smart $]

Ah. Well that explains it then. I'm just stupid.

Fact not yet in evidence.

What it may have explained was that you were, however, ignorant. :angel:

 

[Pharon]

Yep, definitely that, at the least.

Learn something new every day - love this place!

 

[Carultch]

I don't understand why
this UL listed EV charger
can be specd using a 50 amp receptacle
which allows 42 amp flow and
only be required to be protected
by 40 amp fuse
Am I View attachment 13491my missing something?
Obviously!

Maybe its full load is much less than 42A, and 42A is only a maximum "spike" in current.