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i need to install a c-wire for my nest thermostat, which is not a problem for me... except that i am a little unclear on where to attach the new c wire on the boiler end. i have an older utica boiler, single pipe steam, no control board, just a simple 24v transformer and 2-wire system. there is a junction box where the thermostat, gas relay valve, LWCO and automatic water feed all tie in. so, should i attach the c wire there? or directly to the neutral terminal on the transformer? or is somewhere else better?