Need some help.
1200A 480/277V 3ph 4w service that requires a 1200A GFPE main. 1000KVA 480/277V 3ph 4w generator (also with 1200A GFPE) will back up the whole building.
I would like to use the 4-pole ATS to avoid false tripping because of the GFPE.
Questions:
1) Where do you have to bond the ground and neutral to prevent them becoming parallel conductors?
My initial thought was, utility xfmr feeds the 1200A CB w/GFPE(service disc), bonded at this point, then service disconnect feeds one side of the 4-pole ATS (no bond at ATS). The generator will feed the other side of the 4-pole ATS and bonded at gen set. Will this work? why or why not?
2) If the ATS was rated for use as service equipment, can you bond at that point and still use 4-pole ATS? how?
3) Is there a service rated ATS w/GFPE main?
4) Or is this the ideal setup for the 3-pole ATS?
Thank you.
1200A 480/277V 3ph 4w service that requires a 1200A GFPE main. 1000KVA 480/277V 3ph 4w generator (also with 1200A GFPE) will back up the whole building.
I would like to use the 4-pole ATS to avoid false tripping because of the GFPE.
Questions:
1) Where do you have to bond the ground and neutral to prevent them becoming parallel conductors?
My initial thought was, utility xfmr feeds the 1200A CB w/GFPE(service disc), bonded at this point, then service disconnect feeds one side of the 4-pole ATS (no bond at ATS). The generator will feed the other side of the 4-pole ATS and bonded at gen set. Will this work? why or why not?
2) If the ATS was rated for use as service equipment, can you bond at that point and still use 4-pole ATS? how?
3) Is there a service rated ATS w/GFPE main?
4) Or is this the ideal setup for the 3-pole ATS?
Thank you.