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
AssuredElectrical, Master Electrician
Category: Electrical
Satisfied Customers: 3337
Experience:  Contractor-40 Years in the ElectricalTrade
53189252
Type Your Electrical Question Here...
AssuredElectrical is online now
A new question is answered every 9 seconds

Hi there, I would like to run a switching circuit to control

Resolved Question:

Hi there,

I would like to run a switching circuit to control a 30A/220V outlet. (I am putting a shop in my basement, and would like to control a dust collector in the garage.) Based on my research, it looks like I can do this using either a standard 110V circuit, or go low voltage (24V). I've found power contactors that can take either as input.

I have two questions:
1) Is there any reason to pick one route over the other? It seems that low voltage is more common, but I don't see what it does for me other than add the expense of a transformer.

2) If I did use the transformer, am I restricted in where I can install it within a finished space? (I'm used to seeing doorbell transformers left exposed in an unfinished area of the basement.) Can I install the transformer in a metal electrical box and just put a cover on it, or does it need more venting than that?

Thanks in advance!

Dan
Submitted: 1 year ago.
Category: Electrical
Expert:  AssuredElectrical replied 1 year ago.

AssuredElectrical :

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

AssuredElectrical :

Personally, I would use a standard 120 volt coil contactor. No reason or benefit using a low voltage and just adds to expense and equipment that can fail.

AssuredElectrical :

The dust collector probably is a little high in current to use a small relay, and I would suggest a lighting style contactor to control the power.

AssuredElectrical :

We do this is child care/adult care environments, connecting the stoves through a contactor, so that when the fire system is initiated, it turns off power. Yours would be a little different as you are turning it on when something else takes place.

AssuredElectrical :

What you want to do is this: Run your 220 volts with ground from the circuit breaker to a box large enough to house the contactor. Then from the contactor to the receptacle for the dust collector. Then run your 120 volts to your control and to the contactor coil. So, when you apply 120 volts to the contactor, it makes and turns on power to the dust collector. I dont know what you are using to control the coil on the contactor, but it just needs to make and break the hot wire, neutral would connect straight through to the coil

AssuredElectrical :

Full Size Image

Expert:  AssuredElectrical replied 1 year ago.
A contactor similar to this one with 120 volt coil--CLICK HERE

Just reply for any clarification or additional info,
Thanks
Customer: replied 1 year ago.

Hi,


 


First of all, thank you so much for your fast (and helpful) response! Wow! Even with a figure! I'm very grateful for the thoroughness of your reply, so thank you for that.


 


FYI, although I saw your reply shortly after it came in, the web browser I am using at work is ancient and would not let me type a reply.


 


Anyway...


 


I appreciate the confirmation that there's nothing wrong with using standard 110/120V to power the contactor coil. Every resource I've seen that discusses what I'm trying to do talks about stepping down the voltage and using thermostat wire, but I didn't see the point. As you said, more expense and more chance for failure.


 


Only two minor things left. I'm assuming the inspector will want a "means of disconnect" near the receptacle, so I was intending to purchase a small shutoff box and install it between the breaker panel and the contactor. Do you think that's unnecessary? Something like:


 


http://www.amazon.com/Your-One-Source-L211N-Non-Fus/dp/B00002NB3H/ref=pd_sim_sbs_hi_2


 


Last thing, you suggested a lighting style contactor. Is there something that makes it more appropriate than other styles of contactors? I was originally intending to get one of the following:


 


http://www.amazon.com/dp/B008KNRTD0/ref=wl_it_dp_o_pC_S_ttl?_encoding=UTF8&colid=ILTGXLSTX7R2&coliid=IAQDUHXSY9TUY


 


http://www.amazon.com/dp/B004Z0RLL2/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=ILTGXLSTX7R2&coliid=I3I0Y3R085GK5F


 


Thank you so much again for your help. I really appreciate it. (I would submit the rating now, but I wasn't sure if that would close the question out and prevent my reply from going though. :)


 


Thanks,


 


Dan

Expert:  AssuredElectrical replied 1 year ago.
I understand on the ability of reply, some of the browsers in their different versions do not work well with live chat.

On the contactor, I would suggest the Eaton C25BNB240A over the other. Rating is good for application and should give a good longevity as their products are very good.

On the disconnect, you could use that one, or just install a plain 20 amp double pole switch to use. If the circuit is going to be 30 amps, they make a 30a double pole as well.

Now, if the breaker panel is in a line of sight of the contactor, you do not need the shutoff between, but if not, I would just use the switch for working on the contactor.

The dust collector, if plugged into a receptacle, does not need any cutoff itself, as the plug and cord is allowed by code for it to be the disconnect on maintenance.

Let me know if anything else is needed.
Thanks

AssuredElectrical, Master Electrician
Category: Electrical
Satisfied Customers: 3337
Experience: Contractor-40 Years in the ElectricalTrade
AssuredElectrical and 3 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... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...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
< Last | 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:

    1425
    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
< Last | Next >
  • http://ww2.justanswer.com/uploads/mikepettinato/2009-9-4_41145_DSC005132.jpg Mike's Avatar

    Mike

    Master Electrician

    Satisfied Customers:

    1425
    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
  • http://ww2.justanswer.com/uploads/WI/WireitUp/2012-6-17_18212_Photo00006.64x64.jpg Jason's Avatar

    Jason

    Service Technician

    Satisfied Customers:

    3278
    Over 15 years of experience in all types of installations, troubleshooting, and repairs.
  • http://ww2.justanswer.com/uploads/MI/MikeG2010/2012-6-7_192640_IMG01612.64x64.jpg Mike G.'s Avatar

    Mike G.

    Master Electrician

    Satisfied Customers:

    5318
    Proven Professional 45 years Experience
  • http://ww2.justanswer.com/uploads/AS/AssuredElectrical/2011-9-13_221243_me.64x64.gif AssuredElectrical's Avatar

    AssuredElectrical

    Master Electrician

    Satisfied Customers:

    2149
    Contractor-40 Years in the ElectricalTrade
  • http://ww2.justanswer.com/uploads/electrifier/2008-12-16_200429_headbob1.jpg electrifier's Avatar

    electrifier

    Master Electrician

    Satisfied Customers:

    1454
    Electrical contractor and electrical inspector for over 24 years with phone and networking expertise
  • http://ww2.justanswer.com/uploads/rich03dungo/2010-3-17_101556_tshirt2.jpg Rich's Avatar

    Rich

    Master Electrician

    Satisfied Customers:

    1115
    Over 35 years residential, commercial, industrial wiring, install, troubleshoot, service, maintain
  • http://ww2.justanswer.com/uploads/UR/urelectrician/2012-9-28_223652_JustAnswerPic.64x64.jpg Kevin's Avatar

    Kevin

    Licensed Electrician

    Satisfied Customers:

    993
    27 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
 
 
 

Related Electrical Questions

Chat Now With An Electrician
AssuredElectrical
AssuredElectrical
Electrical Contractor
2567 Satisfied Customers
Contractor-40 Years in the ElectricalTrade