Acceptable form overcurrent protection

[hhsting]

I have EV chargers cabinet which converts AC to DC stand alone remote from EV chargers

The dc cable provided has ampacity of 500A and their is no fuse or breaker provided.


The cabinet manufacturer instruction states that the cabinet have CTs which detect if more than 500A of current is passed thru DC conductors it would shut down the cabinet.

I cannot find this in NEC 2017 as acceptable form of overcurrent protection

So my questions:

1. what forms of overcurrent protection are acceptable fuse, breaker etc? Is this in NEC 2017 some where?

2. Would something above be acceptable form of overcurrent protection or not?

 

[don_resqcapt19]

If this is on the output of the charger, I don't see how it is covered by the NEC.

 

[hhsting]

If this is on the output of the charger, I don't see how it is covered by the NEC.

It is not an output of charger.


Charger is 60 feet away from the cabinet. The cabinet converts AC to DC. There are are cables DC in between

 

[retirede]

Then it’s the output of a rectifier - Don’s comment is still valid,

 

[augie47]

Sounds like it's covered by the Original Equipment Manufacturer.
I would not concern myself with it other than to check for NRTL listing if that's required in your jurisdiction.

 

[hhsting]

I fail to see how this is not covered by NEC???

There are two separate pieces of equipment connected together by 60 feet of cable in between. The cable is provided by contractor Not by equipment manufacturer

 

[augie47]

Not uncommon for an "assembly" to consist of more that 1 piece of equipment under one listing.
Interconnecting cables installed per 110.3b

 

[hhsting]

Could be or maybe not. However is their anything in NEC 2017 that says acceptable forms of overcurrent protection? Such as breaker fuse etc

 

[petersonra]

I have EV chargers cabinet which converts AC to DC stand alone remote from EV chargers

The dc cable provided has ampacity of 500A and their is no fuse or breaker provided.


The cabinet manufacturer instruction states that the cabinet have CTs which detect if more than 500A of current is passed thru DC conductors it would shut down the cabinet.

I cannot find this in NEC 2017 as acceptable form of overcurrent protection

So my questions:

1. what forms of overcurrent protection are acceptable fuse, breaker etc? Is this in NEC 2017 some where?

2. Would something above be acceptable form of overcurrent protection or not?

Is it listed

 

[don_resqcapt19]

Could be or maybe not. However is their anything in NEC 2017 that says acceptable forms of overcurrent protection? Such as breaker fuse etc

Try reading Article 240...it is titled Overcurrent Protection.

 

[hhsting]

Try reading Article 240...it is titled Overcurrent Protection.

Ok but exactly which section in it?

 

[don_resqcapt19]

Ok but exactly which section in it?

no idea, but I though you knew how to read....however there is no reason to believe that any additional OCPD is required based on the LIMITED information that you have provided.