Motor thermal protection

[Sandro Baptista]

Does someone know if the standard procedures for electrify electrical plants oblige to thermal protect the electric motors.

It should be protected or it is a must?

Regulation procedures on the CE Europe would be prefered.

Thanks

[Quality]

All I know is that the 17th edition states that motors exeeding 0.37 Kw must have thermal overload protection .

I will find the reg number if you want it

[Sandro Baptista]

I would be grateful.

Thanks a lot.

[Quality]

552.1.2

Is the reg I think is applicable

[goshen]

 hi 
dont forget when dealing with smoke & fire exhust fans only magnetic protection is needed!!

[Sandro Baptista]

552.1.2

Is the reg I think is applicable

Thanks Quality, but:

Where I can get it that article?

[Quality]

I think the only way is to buy a copy of the 17th edition.

Its about 50 quid on amazon

[Sandro Baptista]

50 quid on amazon?? Sorry, I didn't understood

[Tayters]

Quid is english slang for a Pound.
Amazon is the website.

Bob's your Uncle!

Andy.

[Sandro Baptista]

Can you tell me the http of the website?

[Quality]

http://www.amazon.co.uk/books-used-books-textbooks/b?ie=UTF8&node=266239

There ya go;)

[Sandro Baptista]

Quality,

I know that you have payed to get the information about the electrical procedures...Can you just send me the page where it's states that motors exceeding 0.37 Kw must have thermal overload protection.

...Maybe some day I can pay you some how ;)

[Quality]

Did you get the information you wanted ?

[Sandro Baptista]

Yes. I have replied to your email.

Thanks again Quality.

[ManxManSam]

The original post was regarding the thermal protection of the motor, the IEE 17th refers only to the circuit protection of the motor. Motor thermal protection is usually either a thermistor or thermal fused embedded in to the windings, that are then connected in to the control circuit of the motor, this method of protection is usually for larger motors, but better manufactures fit them down to motors smaller than 1.0kw, usually dependent on application of the motor. Even when they are fitted to a motor winding, some numpties don't use them in their control circuits. Most decent control circuits have them included, and if the motors don't have thermals fitted, they are just shorted out in the controls. Only thing to remember is the two different types have different control circuit types, the cheaper are thermal fuses (some times known as Klixons) and are the usual for smaller motors. Larger more critical motors have thermistors embedded, as these offer a more precise method of thermal protection.
Hope this helps...!!