Double ended switchgear design | Information by Electrical ...
2005年10月14日 · Re: Double ended switchgear design 250.24 (3) Dual Fed Services. Common grounding electrode connection to the tie point of the grounded conductors permitted. 250.30 (2)(b) Multiple SDS common grounding electrode conductor sized to 250.66 I have never seen a 4 pole tie breaker used in a M-T-M configured switchboard.
Double Ended Switchboards | Information by Electrical …
2007年5月21日 · Double ended switchgear is often used in industrial plants where continuity of service is important. On the process side, there will be two pumps, an A & B in the same service, but only one will run at a time. All of the A loads are fed by the A bus and the B loads by the B bus to provide redundancy and better reliability.
Two MV feeders for double ended MV switchgear | Information by ...
2013年11月24日 · When we have more than two feeders coming from the utility (may be two different substations) & feeding double ended MV switchgear at two sections, the two sections feeding an interconnected loop (no of RMU+XFMR), my question regarding the requirements for this loop when both sections are...
Kirk Key Double ended swichgear | Information by Electrical ...
2013年11月20日 · SWITCHGEAR LABEL QUESTION SWITCHGEAR LABEL QUESTION We have a switchgear with 2 main breakers used in a alternate way , one on each end of the switchgear using a kirk key system . this is a one service feed with the two cb labeled #cb1 and cb#2. My question is on our arc flash labels the #1 cb is listed as EQPT.
Double Ended Switchgear Neutral and Grounding Bonding
2013年3月21日 · If you have a two double ended switchgear with two tie breakers, each fed from a utility transformer (480/277- Secondary). The tie in conductors between the gears have neutral and ground conductors. I was told by the contractor the bonding of the neutral and ground should only happen at one of...
Ratings on double-ended switchgear 1 - Eng-Tips
2003年5月19日 · What is the proper way to size transformers for double-ended switchgear?? For example I have a switchgear with a left and right section with a normally open tie breaker . Each bus rated for 4000A. The load on each side is approximately 3400A at 480 volts 3-ph. If one transformer fails is it...
Double Ended Substation / Kirk Key Needed? | Page 2
2009年5月18日 · My facility has 9 double ended substations (M-T-M) that have kirk key interlocks. When our facility was constructed it was fed from two substation transformers, whose primaries were connected to the same feed from the utility. Some time later one of the transformers was removed, and both main feeds into the plant were connected to the same source.
TIE Breakers | Information by Electrical Professionals for Electrical ...
2004年11月28日 · (snip)there are hospitals, television stations, radio stations, etc. that use double ended switchgear and get a double feed. (snip) ***** Well, cigar did say, "large facilities". I haven't worked with (on) double ended stuff smaller than 1000kVA xfmrs, or …
Triple-ended Switchboard? | Information by Electrical Professionals …
2007年6月24日 · Triple Ended Switchboard(Switchgear) Update Triple Ended Switchboard(Switchgear) Update Good Morning Forum, Here's an update (bigger picture). Nameplate data from the equipment. GE Powerbreak Switchboard LV SWGR 480/277v 3 phase 4 wire Product type PB 6000 amp supply 4000 amp section 6000 amp neutral 100,000 AIC
Double ended Switchgear Feeder size | Information by Electrical ...
2010年6月9日 · I'm working with a design engineer who is using the the 75c rule, feeding from a 4 wire 200% Nautral System double ended Main-Tie-Main to a Building 90 meters away with the same type M-T-M. the thing i can't get over is we are feeding a 3000AMP X 2 Switchgear with 12 sets EACH 500MCM if we were able to use 90c calculation, it would drop down to ...