I have a 1.5hp well pump on a 20a circuit at my cottage. I like to turn the
pump off during the week, but the switch is in a very inconvenient place. I
would like to replace the switch with a 120v relay, and run a switch off it
to near the front door.
I went to the local electrical supply and they recommended Grainger. I
checked Graingers catalog and they have thousands of relays.
Any idea which of them I want? Any alternate ideas/suppliers? Thanks.
Using a relay would over complicate the wiring. Just run a 12/2 cable from a
junction box ahead of the existing safety disconnect, to the new switch
location you want and break one leg through a 20 amp switch
Why did you say DPDT? Wouldn't an SPST or SPDT be enough. He didn't say
it was a 240 volt circuit, did he?
He could also use a relay with a 24 vac coil along with a 24 volt
transformer,which might make for a less complicated wiring job to his
Just in case, that's all. I figured if he was going to make a trip to the
supply house he might as well get a DPDT in case there was something else he
wanted to switch at the same time. They cost pretty much the same.
Yep, that's a good idea. That way he can run smaller gauge (and much cheaper)
cable to the pump, and it's much safer too.
X10 Appliance module and a remote wireless switch. Most hardware stores
sell some sort of switch and module under a few other brands. These are
particularly popular for christmas lights but should be available year
round. Check walmart
An X10 Appliance module will not handle a 1 1/2 HP motor.
Make sure the relay can handle the spec'ed HP of the motor. A problem with
relays, especially if they are abused is the contacts will weld themselves
Another problem is when switches use low current they can build up
contamination because there is not enough curernt to keep the switch
clean. So be sure to use a switch rated for the voltage you intend to use.
Very happy to see that posting. Completely agree adding the wording
'low or zero current'! And 'sealed' switches/relays where you can't
get at the contacts a problem.
That's why low voltage switches and relays can sometimes be a pain to
Even though relay contacts and switches often designed to slightly
wipe their contacts each time operated contact corrosion can occur, so
that when switch is operated to make contact nothing happens!
It was standard practice in he telecomm industry to provided 'contact
wetting' , which consisted of a very small current (usually of the
order of one thousandth of an amp) flowing in the 'Off' condition to
prevent contact contamination which could occur in quite clean
environments. Gave the term 'Dirty Contact' a whole new meaning!
Wetting often not possible with low voltage control circuits.
To the OP, a length of 2 wire (or 3 wire) #12 or #14 (Plus ground)
run to a 15 amp switch somewhere near the exit door and interposed
into the black live lead of the pump circuit would do it?
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