Permanent whole house generator

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iwire said:
Pierre I find this surprising but a service rated transfer switch is not required to have internal OCP. (UL white book)

Service rated transfer switches can be purchased with or without internal OCP.

I have no idea why someone would want it without OCP as your going to have to provide it 'immediately adjacent to'


Might the reason be that there is an existing OCPD which need not be duplicated. Install the service rated switch ahead of the existing OCPD (say the main disconnect breaker in a load center). Could the ATS be installed "immediately adjacent to" and upstream of the existing OCPD?

Paul
 
tom baker said:
"Would a disconnect be required between the meterbase and the transfer switch ?"
Pierre, no, if its a listed transfer switch for service entrance.
I don't like this without a service disconnect ahead of the ATS.

I agree, makes life way to hard to test/service the generator...
 
stickboy1375 said:
I agree, makes life way to hard to test/service the generator...


Exactly how does a service rated ATS installation make it any harder to test/service the gen-set?
 
Bob
I inspected another one today. I took pictures of it just to show this type of installation. Please let me know how to get these pictures on the site for you and others to see.
Thanks

P.S. I have reorganized my photos. I eliminated about 6500 of them. I now have 9000 in folders, organized and labeled for ease of locating later. If the pics of the transfer switch work out and Mike does not mind, I will post more pics for discussion... I have some very good - terrible pics.
 
I found this whole discussion amusing....

I found this whole discussion amusing....

Because here is the CF that we have after WEEKS of insectors, fire marshalls and engineers kicking thier two cents worth in. I will have to take some pictures of this for you.

We have on the outside of a small commercial building..

a 200 amp service (no 3 phase) should have been REALLY simple to do this...

So utility feed comes down off the pole into the meter base which has a 200 amp breaker in it...the service than runs to the inside of the building and hits a 200amp stand alone breaker and than feeds into a three position manual transfer switch. The load side of the switch than feeds another 200 breaker which feeds the main panel in the building.

on the outside if the building is a nice hubbel pin and sleeve connector for a "portable" generator. The connector is mounted and piped into another 200 amp breaker that feeds the generator side of the manual transfer switch.
So when Im running from utility power there are three breakers in line before I hit distribution and two when Im on generator...not to mention the breaker in the generator.

So when you look at the demarc in the utility room you have the utility side "main" breaker mounted in its own box on the left, the manual transfer switch in the middle, and a 200 amp breaker mounted to the right for the incoming generator line....and finally the distribution panel with a 200 amp breaker as the main in that...

did i really need to pay for all that equipment and labor?? My electrician says no.....BUT...thats what everyone agreed on....
 
It sounds like you have some serious overkill in that system.

What is the KW rating of the generator?
What is the amperage rating of the generator connection?
What is the wire size from this connection to the transfer switch?
What is the amperage rating of the transfer switch? Does it have a marked off position?
steve
 
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