We are connecting an 800 kW emergency generator to a 1600 Amp 4 pole automatic transfer switch. The consultants plans call for installing four sets of 4 500 MCM per phase in 4 - 4" rigid steel conduits. We are planning on installing them in a mixed phase configuration with 4 500 MCM phase conductors, 1 500 MCM neutral conductor and an equipment ground conductor in each conduit. We plan to loop the equipment ground conductor through the bond bushings at the switchgear side. The overcurrent device on the generator is 1600 amps. We would like comments on the following issues: 1) What size should the equipment ground conductor be? The bond bushings are rated up to a 1/O cu wire. Can we install a larger lug on the bond bushing or are there bushings available that would accept a larger conductor? Will installing a larger lug void the U/L rating of the bushing/lug combination? 2) We have no neutral load (only three phase motor and SDS through step down transformers). Are we required to install a neutral conductor from the generator (outside)to the ats (inside) or can we bond the ground and bond the neutral at the generator breaker?
Thanks in advance for you replies.
[ April 15, 2003, 11:48 PM: Message edited by: wirestu ]
Thanks in advance for you replies.
[ April 15, 2003, 11:48 PM: Message edited by: wirestu ]