110/220V safety questions

• To: mail11: ;
• Subject: 110/220V safety questions
• From: pierson-at-msd26.enet.dec-dot-com
• Date: Fri, 13 Sep 96 11:06:03 EDT
• Cc: pierson-at-msd26.enet.dec-dot-com

>From sroys-at-umabnet.ab.umd.eduMon Sep  9 22:48:36 1996
>Date: Mon, 9 Sep 1996 11:05:12 -0400 (EDT)
	(OK.  I;m still behind...)

>I have a pair of 30A contactors that I want to use in my 220V control
>cabinet.  The problem is that the power to the cabinet is going to be
>from a 3-wire 220V outlet (2 hot and a ground), and the relay coils are
>energized by 110V.  I have been told that I should have a 4-wire circuit
>if I wanted to use a single side of the 220V line to get 110V at any
>appreciable current,
	Thats the right way, the code way.
	Wiring to the GROUND is a code nono.  But it would work.

	An alternative would be to wire the contactor coil in series with
	an apropos power resistor or light bulb (FREE: Pilot Light...)
	across the 220.

	(if the contactors are both goping on and off at the same time
	Put the coils in series.... (if the contactors are identical.)

	regards
		dwp

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