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Author Information Topic:   sump pump and dehumidifier on same circuit?
Member

   
Name: Robert Craft
Email: racraft@hotmail.com
Location: New_York
Title: Electrical/Computer Engineer
In Trade Since: 1984
Registered: Jul 2001
Total Posts: 36

posted January 09, 2003 at 01:29 PM       Edit/Delete Message
Is it within code to plug my dehumidifier into the same circuit as my sump pump. The sump pump is plugged into a dedicated 20 amp curcuit, duplex outlet. I want to plug the dehumidifier into the second outlet of the 20 amp duplex outlet.

IP: 24.24.30.72

Member

   
Name: Andre Michalik
Email: amichalik@msn.com
Location: Illinois
Title: Electr. engineer, instructor, cert. inspector
In Trade Since: 1985
Registered: Jan 2002
Total Posts: 545

posted January 09, 2003 at 03:10 PM       Edit/Delete Message
Check FLC (full load current) for both motors.
If 125% FLC of larger motor + FLC of smaller motor is less or equal 20A - it is OK.
Also, if sump pump is judged as "fastened on place", its current should not be higher than 50% of circuit (no more than 10A) - 210-23-a
Andre

IP: 209.242.51.130

Member

   
Name: Scott Stevens
Email: stevelec@charter.net
Location: Massachusetts
Title: Electrician
In Trade Since: 1988
Registered: Apr 2002
Total Posts: 420

posted January 09, 2003 at 03:21 PM       Edit/Delete Message
Does the NEC actually govern what people can or can't plug in in a given situation?

IP: 66.189.51.110

Member

   
Name: Mike Parks
Email: mike@yourhomesok.com
Location: Columbus Ohio
Title: ESI Electrician Plumber HI
In Trade Since: 1993
Registered: Oct 2002
Total Posts: 174

posted January 09, 2003 at 03:41 PM       Edit/Delete Message
Robert
Read 210.8(A) Exception No. 2

Scott
Yes
The above is one of many.

Andre
I doubt if a residential sump would be considered "fastened" do to the cord and plug connection. I believe 210.23(A)(1) would apply. 80% max.

Mike P.

[This message has been edited by mike@yourhomesok.com (edited January 09, 2003).]

IP: 209.51.206.232

Member

   
Name: Robert h Keis
Email: rkeis@dca.net
Location: Delaware
Title: Consultant
In Trade Since: 1960
Registered: Feb 2003
Total Posts: 9

posted January 09, 2003 at 04:31 PM       Edit/Delete Message
I don't see how a sump pump or humidifier could be judged to be fastened in place.

IP: 208.0.34.228

Member

   
Name: Robert Craft
Email: racraft@hotmail.com
Location: New_York
Title: Electrical/Computer Engineer
In Trade Since: 1984
Registered: Jul 2001
Total Posts: 36

posted January 10, 2003 at 07:50 AM       Edit/Delete Message
The sump pump is fixed in place, much like a washer is. There is a hole in the floor containing the pump and a drain pipe through the basement wall that it drains through. Not to mention my basement is sloped ever so slightly in that direction. I cannot move the sump pump without extra work.

The dehumidifier, on the other hand, can be rolled anywhere in the basement and simply plugged in. It only requires an electrical outlet.

I suppose my question is really, "Can anything else be plugged into a dedicated outlet besides the dedicated device."

The sump pump and the dehumidifer togther are well within the load limit for a 20 amp circuit. When my basement is remodeled next month, the existing 20 amp curcuit for the sum pump will remain. The electrician will be running new circuits for general purpoase lighting and outlets. Will he need to run a new circuit for the dehumidifier, or can it go on the same circuit (in the same duplex outlet) as the sump pump?

IP: 24.24.30.72

Member

   
Name: Mike Parks
Email: mike@yourhomesok.com
Location: Columbus Ohio
Title: ESI Electrician Plumber HI
In Trade Since: 1993
Registered: Oct 2002
Total Posts: 174

posted January 10, 2003 at 08:07 AM       Edit/Delete Message
Robert

This is how I would do it.

Single 20 rec. for sump pump.
GFCI duplex for the dehumidifier.
On the same circuit.

Mike P.

IP: 209.51.206.232

Member

   
Name: Richard Caudill
Email: rcaudill@columbus.rr.com
Location: Ohio
Title: Product manager
In Trade Since: 1978
Registered: Dec 2001
Total Posts: 79

posted January 10, 2003 at 12:23 PM       Edit/Delete Message
Would you notice that a fault (perhaps not GF)caused by the dehumidifier had tripped the sump pump OCD? How fast does the water rise in the sump? When you go on vacation will the dehumidifier be unplugged? Separate from code(minimum)requirements is it a good idea?

IP: 65.209.187.121

Member

   
Name: Mike Parks
Email: mike@yourhomesok.com
Location: Columbus Ohio
Title: ESI Electrician Plumber HI
In Trade Since: 1993
Registered: Oct 2002
Total Posts: 174

posted January 10, 2003 at 05:45 PM       Edit/Delete Message
I should have been more clear in my previous post.

I put nothing on the sump pump circuit except the door bell transformer.

Why? Just ring your doorbell. If it rings the breaker is on. This does not mean the sump pump is working, however it lets you know the sump pump has not "tripped" the breaker.

Mike P.

IP: 209.51.206.196

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