Hello, I am trying to set up some automatic transfer switches for critical loads that are currently residing within 2 subpanels. The critical load circuits aren't mapped out, so I don't know how many of these critical loads reside in subpanel 1 and how many reside in subpanel 2. Each sub is 100 amps, being fed by a 400 amp main. The load calculations for the critical loads ask for 100 amps of power, so i need a 100 amp ATS. Now, since each subpanel is already 100 amps, and already has several circuits, I can't use a 100 amp ATS. My plan was to install 2 50 amp ATS's, each being powered by 50 amp breakers, i.e. 50A Breaker Subpanel 1 goes to ATS 1 & 50A breaker subpanel 2 goes to ATS 2. I will attach a diagram to illustrate. System is 3 phase 120/208ATS is single phase and will be fed with 2 legs to make 208 (I've already researched the ATS, it registers 208 for the transfer back to utility)Additional information. The ATS generator side will be a portable genny run on natural gas, approximately 21kw of power with natural gas. Genny has 2 50 amp outlets and I plan on using one outlet for each ATS.Please dont ask why I can't just put the ATS on the 400A main and transfer everything to that, that is not an option. Each ATS has circuits (16 spaces) where the critical loads will be.All critical loads are 120 volts
the main panel and both 100 subpanels are exisiting btw
>>2975909>critical loadthis sure seems like it would be better asked to the company selling the switchgear instead of random faggots on a humorboard. they do this shit 5 days a week and can point out detail shit most would miss
>>2975909thanks for the blog postif you have a question feel free to follow upgood luck
>>2975949my question is. will it work?
>>29759331 of 2 things will happen when you ask a company that dedicates themselves to this. 1, they tell you its a skill issue and to hire someone or 2 they try to charge you to come out and evaluate the situation, then charge you to do the work
>>2975951>then charge you to do the workits already priced into the product. use the sales service they provide and make them show their long hand calculations. they willt. bought more eaton abb this year than you house cost
>>2975909>dont ask why I can't just put the ATS on the 400A mainFuck you! Why can't you just put the ATS on the 400A main?
>>2975909Obviously no.Unless the atss are absolutely perfectly synchronized to within the speed of light travelling 1 inch, then one of them will be up against the full 100 A load and disintegrate by the effects of 2X rated capacity unless they’re solid state using SCRs or something and it can handle the overcurrent for a few ms.
>>2975951I don’t know where you are but I’m in europe and in my experience eg ABB or Eaton customer service will happily tell you stuff like this. One time ABB even asked me to send schematics and reported back with the numbers I needed. Took maybe 3 business days. Maybe don’t tell them you already bought their product, the sales guys are more eager to help than the aftersales/customer service people
how do i get a job like thisunless there's something i'm missing and an ATS isn't functionally a 3PDT switch this seems braindead easy
