Discuss Spray Booth fan help. in the Commercial Electrical Advice area at ElectriciansForums.net

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Shimon

HI! could someone tell me the the correct circuit for a spray booth fan.What would be better 2 pole or 4 pole motor? (Single phase only) Also i would for example, need a DOL starter for that and a AC speed control to vary the speed.

Its a inline axle fan 700mm diameter. If any one could give me a diagram of the circuit and what they would advice i would much appreciate it.

Many Thanks!
 
Welcome to the forum mate.

Is this for in a factory or garage or where ....?
Do you currently have the motor?
What supply do you have?
Do you really need a speed control?
What did the electrician who is installing this say?
I presume you would want a cert to say that the install has been tested and is safe afterwards?
 
Is there not a drawing and instruction that came with the fan?
 
I'll second Rob's comment on here, if this is for a spray booth where you are extracting fumes that could potentially be explosive if they build up then there are strict regulations and guidance for this type of install, explosion proof fixtures and fittings and if required intrinsically safe controls, this will cover most types of spray booth that you will find in the industry as most do use hazzardous paints. This is not covered by the BS7671 and if this is in fact the kind of spray booth you are working on then it's very unlikely in asking the question that your are insured to do so and qualified for that matter as you would need further training to work on such installs.

I may be wrong here and you're refering to a water spray booth for cleaning stuff down which is a different matter altogether so if you can clarify :)
 
Thank you for your responses. I have built my own spray booth and have invested in a explosion proof fan switches ect. that are mounted externally. I have not got a problem having someone come in a wire it up properly, however i was just interested in the circuit used. I don't have 3 phase so i have a 230v two pole motor that is mounted on the spray booth fan. I do spray solvent based paint and the speed control is to regulate how much paint is being extracted. I do feel that i about to be tared her. yes i know you have to be qualified and insured and also the risks involved in a room full of atomized solvent and paint. so please treat this as information only.
 
With all respect here, we do help where we can but under the circumstances of what you are asking and the obvious safety risk associated with such work I'll have to say that the only advise we can offer here is to get a registered industrial contractor on board who is competent and has the paperwork to work on such installs, I personally over my career know of 1 death and 3 serious injuries associated with spray booths all down to breaches in regulations and the forum wouldn't be seen to be giving good advice in offering information on such an install where it is clear by your profile you have no electrical qualifications.
You also need to consider the fan itself needs to be rated for this kind of installation and if you are willing to pay the very high costs of this equipment as with any electrical equipment within the booth as you suggest then I cannot see why you cannot contract in a professional here.

There are regulations that govern how extraction equipment, monitoring and controls associated with said spray booth, we cannot advise without knowing your set-up which may suit a particular type, there are a few methods available but most are a closed loop control system that looks at air content or even at the spray gun been lifted off the hanger to initiate full speed from a low speed idling, when you have manual control a certain element of human error is put into the equation and this can be costly as what you believe to be the correct speed may in fact be allowing a build-up of explosive gases/particles hence you really need to employ the correct people to either do the work or advise you and check the work during the install and before use.
 
Thank you! I under and it was a very respectful and apt answer that makes allot of sense. I think I will leave the post with that one as it seems sound advice. I shall give someone who deals with it a call andvlet tjem undertake it and i suppose for interest value I can at least see what they do and ask them questions.
All the best.
 

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