A customer is currently in the process of starting up a new 4000V rated 8000Hp compressor. He is considering something in the 8000-10000 Hp range for another new facility. Should he go to a higher voltage for that size? If so which? Are there many motor shops (this is in the US) that can...
Several of our customers have asked us to change the auxiliary switch block and actuator to comply with a safety recall of GE 5 & 15kV Powervac breakers manufactured in the 1999 to 2002 time frame. The replacement parts seem to cause problems where none were apparent before. Has any one else...
I have searched in vain on the GE website for the answer to this question: If you have current production MVT Plus trip units on their Wave Pro or Power Break II low voltage breakers, and you have one of the two zone interlocking options, and you wish to defeat the zone interlocking feature...
A three year old commercial facility recently began experiencing a problem with molded case breakers opening for no apparent reason. In almost all cases, the breakers open they do not trip! The breakers are all Square D "homeline" (a residential grade) or type QO (a commercial grade) and range...
A customer has an unusual distribution system that may be ill-advised but has been operating for some time. The utility services the site with a 4.16kV solid grounded source. The customer takes delivery through a 2000A breaker and then uses a delta delta 7500KVA transformer to step up the...
A customer has several 800A rated or larger Motor Control Centers with 22,000A bus bracing and 39,000A available short circuit current. Has anyone had success using reactors at this voltage level to get the fault current down to an acceptable value. If so, can you recommend a manufacturer? Any...
