I'm a construction engineer for Lockheed Martin and I'm involved in a project to install two rack mounted Emerson ac/dc rectifier systems in a Telecom environment. The original design called for connecting the DC loads to the individual factory provided 60 Amp breakers. We are now being told by the A&E to use a larger conductor than the system is designed to accept (4/0 vs. 2 AWG) and to also bypass all overcurrent devices and to terminate the 4/0 cu directly to the portion of the buss that is reserved for the battery connections. They are attempting to turn the system into a single 400 Amp output distribution instead of individual branch circuit loads. To even make the connections of the 4/0 cable to the battery buss, the buss will have to be drilled to accept the 3/8" hardware for bolting the double barrel lugs to the buss and there are serious space restrictioins between the +/- buss. (the buss is set up with two 1/4"-20 studs 5/8" OC from the factory. To make things even more crazy, the new rectifier system will be used to feed a remote DC distribution cabinet that supports individual 60 Amp loads. My electricians are telling me that this application of the new rectifiers is not correct and that if we follow the instructions of the A&E, a number of NEC violations will be created (no OCD) and we will void the UL Listing for the
Emerson rectifier system.
Not to mention the hazards that are being created for personnel.
Please provide your opinion on this install that is dangerously off track.
Thank you,
bigmack11
Emerson rectifier system.
Not to mention the hazards that are being created for personnel.
Please provide your opinion on this install that is dangerously off track.
Thank you,
bigmack11
