MOTOR SPACE HEATER CONTROL
MOTOR SPACE HEATER CONTROL
(OP)
Hi Folks, I was just wondering why some of our design clients' standards sometimes specify that the motor space heater control, which is supplied from 240VAC 50Hz line to neutral supply, be connected to two (2) NC (normally closed) contactor auxiliary contacts.
In my view, since the supply is line to neutral, one (1) NC contactor auxiliary contact wired in series with the phase wire is enough. Is there any technical concerns why 2 NC are required?
In my view, since the supply is line to neutral, one (1) NC contactor auxiliary contact wired in series with the phase wire is enough. Is there any technical concerns why 2 NC are required?
GO PLACIDLY, AMIDST THE NOISE AND HASTE-Desiderata





RE: MOTOR SPACE HEATER CONTROL
RE: MOTOR SPACE HEATER CONTROL
JRaef.com
Eng-Tips: Help for your job, not for your homework Read FAQ731-376