ECN Forum Forums Code Related Discussion NEC & other Code issues Generator question??

A 'used' 3 phase, 4 wire, 120/208, 75 KW genset and a 3 pole ATS were donated to our local Fire House.

My question....if the gen is to be connected to provide standby power, do you need a 3 pole, or 4 pole ATS??

Thanks,
John