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[ElectriciansForums.net] Bathroom fan burnt out.....
Had a callout for a landlord as the bathroom fan stopped working.

Didnt take too long to work out why...

Never seen a fan quite as bad as this before!!

Wonder what caused this, possibly got jammed and overheated?
 
The 3A fuse is not there to prevent what happened in the OPs pic but to prevent fire, it will always get to that stage in the pic. I know some university carried out some trials with this and the results were hit and miss between not only the manufacturer of the extractor but also the fuse brand.
 
An appropriately sized fuse designed for use in appliances and built in to the fan would stand a far better chance of preventing fire than a 3A plug fuse
Agreed but when you can get an extractor for two bob and three Woodbines it is not going to happen.
 
This is what happens when an 'impedance protected' shaded pole motor is pad mounted in a cheap plastic frame and it suffers a locked rotor condition. The jammed blade means there's no air over the motor to cool it plus the higher LRA means more heat as well. The plastic mounts weren't capable of handling the heat. Not sure it was actually a fire risk because I doubt it would have reached flash point temperature but certainly poorly constructed and designed.
 
This is what happens when an 'impedance protected' shaded pole motor is pad mounted in a cheap plastic frame and it suffers a locked rotor condition. The jammed blade means there's no air over the motor to cool it plus the higher LRA means more heat as well. The plastic mounts weren't capable of handling the heat. Not sure it was actually a fire risk because I doubt it would have reached flash point temperature but certainly poorly constructed and designed.
Interesting, do you think ZP is considered with the construction of a chuck away extract fan.
 
I always fit 3A fuses in fan isolators using click mode modules..If it had started a fire and gone to court the MI would say it states MUST be protected by 3amp fuse if the contractor hasnot followed these then responsibility could be past to the contractor. For the sake of £1 just i fit it!
 

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Bathroom fan burnt out.....
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