bond at gen. & Man. trans. sw.?

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buddhakii

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Littleton, CO
Hi all. Been awhile since I posted but am having a little confusion on bonding a manual transfer switch. I just want to say thanks for all the good advice and replies. I know this situation will be solved in no time now that I am looking in the right place.

O.k. I have a 1600a 480v service that is back up by a generator. Before it goes to the auto transfer switch it feeds into a section of gear that has two lockout breakers for a roll up gen. So it feeds from the gen., to the mts feeding a 1600a brkr., then to seperate section of gear that contains the service and ats where the neut. is swtched. So if I'm correct I bond the neut. at the gen., but do I also bond at the mts for the roll up gen. I think that should give enough info. If I missed anything I'm sure you all will let me know.

Thanks again guys and gals.
 
buddhakii said:
Isn't the main at the gen. though? Or is does the breaker in the mts become the main?
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Depends on what position the transfer switch happens to be in. There can be two "mains" when you have two independant sources of supply. If the neutral happens to be switched at the MTS, you'd need a bonding jumper in both "mains". In the case of the MTS, if it's a fused MTS, the gen side is your gen main. Normally, however, the genset will have a breaker onboard or with the gen equipment.
 
The gen. does have ocpd, so I know I bond there. The mts also has a ocpd that is fed from the gen. You can shut that off and lock it out before you turn on the breaker right next to it that the roll up is attached to. The neutral is not switched here so it is my contention that you wouldn't bond here. Most roll up gen.'s arn't bonded, but it would still be bonded at the permenant gen. as the neut. isn't switched here. It is however switched in the ats, hence the permenant gen. with the ocpd gets bonded.
 
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