Using generator controller as OCPD

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R

rharaksi

Member
Location
Trinidad
Occupation
Engineer
I have a 165KVA rental diesel standby generator on a client facility. The generator is an AKSA APD165C-6 unit using the Deep Sea Electronics DSE6120 MKIII controller. The controller is UL 6200 listed as a Controller for Use in Power Production: (https://productiq.ulprospector.com/en/profile/4382625/ftpm.e221853?term=DEEP SEA&page=1).

The client’s electrical engineer is of the opinion that the controller’s overcurrent protection does not carry UL 489 or UL 1066 and therefore cannot be recognized as suitable for the specific purpose of overcurrent protection as per 445.12(A) and the controller’s overcurrent setting is 'merely a protective feature of a controller'.

Is this a correct or incorrect interpretation of code?

Code Requirement (NFPA 70 445.12(A))

"Constant-voltage generators, except ac generator exciters, shall be protected from overload by inherent design, circuit breakers, fuses, protective relays, or other identified overcurrent protective means suitable for the conditions of use".
 
Thanks, Ron, for your quick response. The generator package came factory equipped with a 500A un-adjustable shunt trip output breaker. I am using the overcurrent setting of the DSE6120 to trip the package output breaker at a lower setting (180A). The output breaker provides disconnect at the gen package. The power output cables from the gen package are 2/0 AWG shipboard cables and landed to the load side of a reverse feed capable 200A breaker on the client's MCC as a standalone, manually operated, rental power source.
 
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