How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask AssuredElectrical Your Own Question
AssuredElectrical, Master Electrician
Category: Electrical
Satisfied Customers: 4241
Experience:  Contractor-42+ Years in the ElectricalTrade
Type Your Electrical Question Here...
AssuredElectrical is online now
A new question is answered every 9 seconds

Hi: Ive added a dehumidifier in the crawl space under my

This answer was rated:

Hi: I've added a dehumidifier in the crawl space under my house. It trips the breaker fairly quickly (a few minutes). The only other item known to be on the circuit is another outlet currently running the ultra violet sterilizer that my well water passes through. What do I need to have done? Thanks, XXXXX XXXXX XXXXX

Welcome. My name is XXXXX XXXXX would be glad to assist.

Can you verify the circuit?
Turn off the breaker and double check all on the circuit?

Also, look at the ultra violet sterilizer and see if it has a label that shows the amperage or wattage?

What size breaker is it tripping? 15 or 20?

Customer: replied 3 years ago.

The UV sterilizer is 120V, 50A. My Garage Refrigerator is also on the circuit. The breaker is 15A

Ok, thanks.
Well the sterilizer should not be on that circuit, it is extremely large and 240 volts.

So, the refrigerator is all you can find otherwise?

The nameplate on the dehumidifier states it is supposed to be 8 amps correct?
Do you have a voltage tester by chance?

Is the receptacle the dehumidifier is plugged into in the crawl space itself?
Customer: replied 3 years ago.

The plate on the sterilizer reads 120V 60Hz 50 A.


So far I haven't found anything else on the circuit.


Correct 8 amps


I don't have a volt meter.


Both UV sterilizer & dehumidifier are are plugged into separate ordinary household outlets. Borh outlets are mounted to floor joists in the crawl space

Ok, thanks.
On the sterilizer, I suspect that is 5 amps (maybe 5.0) and not 50 because 50 would not operate on a 15 amp breaker.

So, with all you have, the humidifier will not operate.
It is 8 amps plus the sterilizer at 5 is 13 by themselves.
Add the fridge and now you are over the breaker.

Dehumidifiers are like Air Conditioners and normally use a circuit by themselves because of the compressors inside that start and stop as it is operating.

The receptacle being in the crawl space also, probably has some corrosion on the connections which will add to the issue.

I would suggest a new circuit to the receptacle for the dehumidifier or a new receptacle all together.
I would suggest replacing any existing receptacle in the crawl space every 6 months or so because of humidity causing corrosion on the connections also.

You could probably turn off the sterilizer for a while and run the dehumidifier for a test.
That will confirm whether the 2 together are the issue as I suspect.

If you could purchase a heavy duty 12 gauge cord and run the dehumidifier on another circuit, that may work as well.
The cord would have to be heavy because of the amperage and a normal 16 gauge cord would not work long and heat up badly.

Just reply for any other information needed or clarification you may want.
AssuredElectrical, Master Electrician
Category: Electrical
Satisfied Customers: 4241
Experience: Contractor-42+ Years in the ElectricalTrade
AssuredElectrical and other Electrical Specialists are ready to help you

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Previous | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland

Meet The Experts:

  • Mike


    Master Electrician

    Satisfied Customers:

    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
< Last | Next >
  • Mike's Avatar


    Master Electrician

    Satisfied Customers:

    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
  • Jason's Avatar


    Service Technician

    Satisfied Customers:

    Over 20 years of experience in all types of installations, troubleshooting, and repairs.
  • Mike G.'s Avatar

    Mike G.

    Master Electrician

    Satisfied Customers:

    Proven Professional 46 years Experience
  • AssuredElectrical's Avatar


    Master Electrician

    Satisfied Customers:

    Contractor-42+ Years in the ElectricalTrade
  • Kevin's Avatar


    Licensed Electrician

    Satisfied Customers:

    29 years as a Licensed Electrical Contractor in Illinois, 5 year college Electrical Instructor, Former Electrical Inspector, Diploma in Digital Electronics, Former Illinois Licensed Home Inspector
  • electrifier's Avatar


    Master Electrician

    Satisfied Customers:

    Electrical contractor and electrical inspector for over 24 years with phone and networking expertise
  • Rich's Avatar


    Master Electrician

    Satisfied Customers:

    Over 35 years residential, commercial, industrial wiring, install, troubleshoot, service, maintain