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Posted by HeatPro on December 05, 2007 at 08:16:19:
In Reply to: Re: RA889A posted by Mark Bassin on December 05, 2007 at 07:46:50:
So long as there is no voltage from those terminals to ground, there should be no more problem from clean contacts. It's just that the X terminals have better contact materials to protect against resistance when using millivolts. As the contacts age, they might cause some resistance to make operation in the millivolt circuit erratic in a few years.
The relay L.E.D. is on the N.O. terminal line between the N.O. terminal and the 2 or ground terminal; but so long as that ground terminal is on a proper white neutral line, that shouldn't be a problem of draining or overloading the millivolt power.