Low Voltage High Amp DC Overload Protection for Remote Equipment

[jmcnabbkwe]

Is it permissible to utilize a marine "style/rated" circuit breaker for a main DC power feed overload for an industrial panel? Application is a 24VDC powered remote unmanned pollution control system. 24VDC power feed is from a max 320A alternator mounted on an IC engine. The alternator output is 200A 27VDC at 2000rpm which is the normal operating condition. The total max system load at any time is 150A. The intent is to use a 200A main breaker for the power feed.

I am assuming it would need to be UL489 rated?

Thanks for any input...

Jeff McNabb
jmcnabbkwe

 

[iceworm]

Is it permissible to utilize a marine "style/rated" circuit breaker for a main DC power feed overload for an industrial panel? ... I am assuming it would need to be UL489 rated? ...

I don't know what "marine style/rated" means - which likely limits any help. Unless you are looking at the stuff like Eaton marine. That's pretty much consumer grade stuff, and single pole. I have not seen any with a NRTL listing. Doesn't mean they aren't there - I just haven't seen them.

One question: Is this equipment floating? If it is, and if it would not be considered a floating building, the NEC doesn't apply.

Getting by that, if the NEC does apply, I don't know of any requirement for circuit breakers to be listed.

NEC 720 applies - but doesn't say much
And NEC 445 Generators

One thing, if the system is ungrounded, you need a two pole CB.

Like I said, I'm not much help.