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#57398 - 10/13/05 06:17 PM Single pole float switch / 240-volt pump  
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
Please see the warning pertaining to 230-volt installations. Any comments would be appreciated.

Thanks,

John
http://www.lgpc.com/ProductFiles/SpecSheets/994356.pdf


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#57399 - 10/13/05 06:30 PM Re: Single pole float switch / 240-volt pump  
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
Redsy:

there is one waring about the float switch if you wired on 240 volt keep in your mind one leg will be hot all the time.

but one question i will like to know what size pump you are planning to use with this float switch ??

this kind of floating switch is not designed with mangatinc or contractor starter device [ i deal with that before it will " chatter" a little ]

if you plan to use the float switch with maganitc switch or contractor you have to use the double concat float switch [ they have this kind of verison ]


the last thing when you look at the pdf file look on bottom right you will see the 240 volt connection and you will understand why i warn you about one hot leg all the time and you might have to change the plug conferation to 240 volts or hardwired it

i am sure few other guys will chime in on this one too.

Merci. Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


#57400 - 10/13/05 06:35 PM Re: Single pole float switch / 240-volt pump  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Quote
WARNING: 230V INSTALLATIONS: In a 230V pump installation, one side of
the line going to the pump is always “hot”. This condition exist regardless of
whether the float switch is “on” or “off”. To avoid hazards when installing or
servicing, install a double-pole disconnect switch near pump installation.


I do not see the problem.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#57401 - 10/13/05 08:45 PM Re: Single pole float switch / 240-volt pump  
Gregtaylor  Offline
Member
Joined: Mar 2005
Posts: 212
Boise, Idaho, USA
The float switch is a control, not a disconnecting means. This is a common configuration and should present no problems.


#57402 - 10/13/05 09:06 PM Re: Single pole float switch / 240-volt pump  
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
Thanks guys.

I installed a double-pole disconnect at the sump location, but wasn't 100% comfortable about the submerged pump having one energized wire connected at all times.


#57403 - 10/13/05 09:21 PM Re: Single pole float switch / 240-volt pump  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,872
Brick, NJ USA
REdsy:
As Bob said 'no problem'
My 2 cents...being code compliant, and being 'comfortable' are two different animals.

With my EC hat on, I would not be comfortable. Personal preference is to have the float control a relay/contactor at 120 volts, or 24 volts.....but that's personal.

John


John

#57404 - 10/13/05 10:44 PM Re: Single pole float switch / 240-volt pump  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,121
Estero,Fl,usa
Those are pretty standard on our "house" pumps. I have 3 in my aireator tank, controlling 2 pumps and a solenoid valve.
You just have to understand it is not a disconnect.


Greg Fretwell

#57405 - 10/14/05 12:58 AM Re: Single pole float switch / 240-volt pump  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
The problem with the "warning" is that BOTH sides of the switch are always 'hot.' It's just that current can't flow until the switch closes.

French, many of the smaller, say 1/2 hp or less, pumps have switches that carry the full current load. These pumps do not need magnetic starters. The floats usually have some feature which results in a different level for "on" than for "off."

Please remember that, theory aside, the NEC now requires disconnecting means to open ALL 'hot' conductors. Likewise, you are required to have over-current protection on both legs of a 230 single-phase circuit.


#57406 - 10/14/05 04:01 PM Re: Single pole float switch / 240-volt pump  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Quote
Please remember that, theory aside, the NEC now requires disconnecting means to open ALL 'hot' conductors. Likewise, you are required to have over-current protection on both legs of a 230 single-phase circuit.


All very true but we also need to remember that the float switch is a controller and need not open all conductors.

Quote
430.81 (A) Definition.

For the definition of Controller, see Article 100.

For the purpose of this article, a controller is any switch or device that is normally used to start and stop a motor by making and breaking the motor circuit current.


Quote
430.84 Need Not Open All Conductors.
The controller shall not be required to open all conductors to the motor.


I do agree with John I would rather the controller break all conductors.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#57407 - 10/14/05 04:47 PM Re: Single pole float switch / 240-volt pump  
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
Thanks guys.

My primary concern is that the discharge line is 2" copper, partially submerged, and in a common area. Although the pump motor is "sealed", the thought of a slight leakage concerned me.

iwire,

That is the reference I was looking for, although the definition in 430.71 seems to apply to starter-type circuits. I contacted Little Giant, and they said that this is the only control they provide and it is commonly used on 230-volt motors.

Thanks again.



[This message has been edited by Redsy (edited 10-14-2005).]


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