Necessary to switch neutrals on relays?

kevreh

In The Industry
Jun 2, 2007
412
Annandale, VA
This is for a Pentair Suntouch but really applies to any relay in a controller. Currently my Suntouch is wired only to switch the hot, but I noticed the wiring diagram wants me to also switch the neutrals with the same relay. Is this necessary? I know you always want to switch hot, but not sure if neutral is a must or not.
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
11,470
Bedford, TX
K,

Assuming we are talking about 115 VAC, then I don't believe that you ever want to switch the neutral.

With 220 volts, you obviously want to switch both hot leads using the same relay.

Are we talking about anything in particular??

Thanks for posting,

Jim R.
 

kevreh

In The Industry
Jun 2, 2007
412
Annandale, VA
Its a relay to switch a 120v pump. I'm adding a 2-speed relay to my current Suntouch setup and noticed the wiring diagram wants me to switch the neutral too.
 

JamesW

TFP Expert
Mar 2, 2011
13,361
Most two speed motors are 240 volts.

What voltage is your motor?

Can you show the wiring diagrams?
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
11,470
Bedford, TX
K,

The diagram in the Pentair manuals showing a 2 speed pump relay is for a 220 volt motor and the lead marked as "Com" is one side of the 220 volts going to the motor.

It has nothing to do with the neutral in a 120 volt set up.

I think we have some confusion going on... :confused:

Thanks,

Jim R.
 

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