Re: HELP 2 SSRs used on 230V motor--do I need to protect against 110V?
- From: whit3rd <whit3rd@xxxxxxxxx>
- Date: Sun, 14 Sep 2008 10:21:35 -0700 (PDT)
On Sep 14, 9:22 am, Mark Main <em...@xxxxxxxxxxxx> wrote:
[about a 230V appliance]
The circuit breaker at the service panel is a "dual breaker" that
covers both circuits going to the motor... so, if only 1 of these
lines is hot and the motor is turned on, will that trip the breaker?
There's a misconception buried in there: a circuit
is a full current-out/current-return path, and the usual
230V appliance has only ONE circuit. It has two
LIVE WIRES, not two circuits.
A turnoff switch needn't disconnect all live wires from
the motor to perform its function. One SSR will control your
motor (or water heater). To make the wiring safe, however,
your circuit breaker DOES disconnect all live wires.
In case of fault, to prevent fire, that's useful. In case
you want to work on the wiring, to prevent shock hazard,
it's useful.
The SSR (solid-state relay) isn't reliable and fail-safe
the way the circuit breaker is intended to be, so it
cannot do the same job as the circuit breaker in any case.
Thus, "double SSRs" isn't useful.
.
- References:
- HELP 2 SSRs used on 230V motor--do I need to protect against 110V?
- From: Mark Main
- Re: HELP 2 SSRs used on 230V motor--do I need to protect against 110V?
- From: John Popelish
- Re: HELP 2 SSRs used on 230V motor--do I need to protect against 110V?
- From: Mark Main
- HELP 2 SSRs used on 230V motor--do I need to protect against 110V?
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