- Jan 19, 2010
It seems that both is the same as combine....."Combine" does exactly that - combine. The purpose of the on-off switches ahead of the DCP is to take a bad bank out of service so that Combine just utilizes the good bank. The reason I like the DCP switch is because it provides service to 2 banks in isolation simultaneously (4 posts - 2 poles). The 1-2-Both switch doesn't have that capability. You can only have one bank or the other on at a time - unless you switch to "Both", which is not preferred.