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I got stupid question for ya #25724
05/16/03 05:25 PM
05/16/03 05:25 PM
F
frank  Offline OP
Member
Joined: May 2001
Posts: 376
windsor ontario canada
Installed a single phase pressure switch today and when it came time to terminate i questioned the fact that the neutral would open with the switch.I rarely work single phase but have seen this done before.Is it right to wire the neutral through the switch since it does not have to be? thanks

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Re: I got stupid question for ya #25725
05/16/03 06:23 PM
05/16/03 06:23 PM
Z
zapped208  Offline
Member
Joined: Feb 2003
Posts: 197
Somewhere in USA
frank,- What was this switch for? Need more info. Thanks.


Shoot first, apologize later.....maybe
Re: I got stupid question for ya #25726
05/16/03 07:24 PM
05/16/03 07:24 PM
E
elektrikguy  Offline
Member
Joined: May 2002
Posts: 132
woodstock,ga,usa
The only time I see controls with neutrals that are switched usually come from overseas(ex. Taiwan) I would not recommend the practice. Is it possible it is intended to disconnect a single phase 208 volt control. I know...I am reaching. Hard to answer without more info.

Re: I got stupid question for ya #25727
05/16/03 08:59 PM
05/16/03 08:59 PM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
frank,
There's nothing wrong with switching the Neutral as long as the Phase opens and closes at the same time(by the same switch).

Re: I got stupid question for ya #25728
05/16/03 10:50 PM
05/16/03 10:50 PM
F
frank  Offline OP
Member
Joined: May 2001
Posts: 376
windsor ontario canada
Sorry that was so vague. It’s a used 3/4hp 125 volt jockey pump for a sprinkler system. They were jogging the 50hp between 75-100psi.The fire protection company had pipe fitters installed everything but the wiring.I think it was a square D the type where you take the cover off from top.And is rated 208/120v.

Re: I got stupid question for ya #25729
05/16/03 11:01 PM
05/16/03 11:01 PM
C
caselec  Offline
Member
Joined: Apr 2002
Posts: 558
San Jose, CA
Frank,

This is just a standard 2-pole pressure switch and is commonly used for 240 volt motors. If your using it for a 120 volt motor just switch the hot of your motor and don't connect anything to the other pole of the switch.

Curt


Curt Swartz
Re: I got stupid question for ya #25730
05/16/03 11:53 PM
05/16/03 11:53 PM
F
frank  Offline OP
Member
Joined: May 2001
Posts: 376
windsor ontario canada
caselec,
That’s exactly what I would think but a buddy that does machine build for the big three and their feeder plants says the same as trumpy.To be honest neither way looks right to me for some odd reason?Trumpy do you do machine build?Maybe this is a personal preference thing.

[This message has been edited by frank (edited 05-17-2003).]

Re: I got stupid question for ya #25731
05/17/03 12:04 PM
05/17/03 12:04 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Frank, for fire-pump installations, I don’t think that is a stupid question at all.

In the US, I'd be carefully looking over NFPA 20 and the drawings/specs provided by the pump-controller producer. [There is likely a Canadian-equivalent standard.] They may have specific requirements that are substantially different from ordinary inside wiring. Fire-pump installations are nothing to second guess on. Also, I’d find out if the SqD pressure switch is specifically listed for jockey-pump duty. A misapplication could have serious consequences.


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