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Topic Title: New RCD being take out by tumble dryer
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Created On: 07 December 2017 08:22 PM
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 07 December 2017 08:22 PM
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DE4Electrical

Posts: 9
Joined: 20 July 2015

I've just changed a consumer unit at a customers and the rcd is being tripped by their tumble dryer. The RCD tests fine. Maybe a bit sensitive. The dryer had a recall replacement a month ago. Should the customer be contacting hotpoint?
Thanks in advance.
 07 December 2017 08:37 PM
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geoffsd

Posts: 1783
Joined: 15 June 2010

Presumably - if it is the TD at fault.

Were there RCDs in the previous CU?
Did you IR test the circuits?
Is the CU fitted with a couple of RCCBs or RCBOs on each circuit?

It could be an N-E fault on an associated circuit triggering the RCD when a heavy load (the heater) is engaged,
Does it trip with the kettle used in the same socket?
 07 December 2017 09:49 PM
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DE4Electrical

Posts: 9
Joined: 20 July 2015

There was a RCD on the circuit before. I don't remember anything suspicious when I done the tests. Can't get the results at the moment.
There is washers and fridges on the circuit and they've been fine for the last week or so. It also has had a kettle on it. The fault happens as soon as the on button is pressed.
 07 December 2017 09:54 PM
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dustydazzler

Posts: 1501
Joined: 19 January 2016

Tumble driers and r c d s aren't the best of friends

My one st home trips the main r c d from time to time
 07 December 2017 10:44 PM
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geoffsd

Posts: 1783
Joined: 15 June 2010

The fault happens as soon as the on button is pressed.


Looks like it is the TD then.
 08 December 2017 09:54 PM
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anastasis

Posts: 672
Joined: 01 September 2009

Random thought - capacitive leakage from the motor windings to frame when it starts?
 08 December 2017 10:08 PM
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gkenyon

Posts: 4981
Joined: 06 May 2002

If the element is of the concentric, mineral-insulated, type, then it could be a bit of moisture in the element, which might "burn off" when the element warms up.

This is permitted by many product standards, and might take the RCD "over the top" ... clearly the RCD doesn't read the product standards

-------------------------
EUR ING Graham Kenyon CEng MIET TechIOSH
G Kenyon Technology Ltd

Web-Site: www.gkenyontech.com
 08 December 2017 10:48 PM
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AncientMariner

Posts: 726
Joined: 14 December 2004

Subject to satisfactory earthing, if there is an available socket which is not via a RCD, it may be worth seeing if you can dry out the element by running it plugged in there. Maybe the cooker socket? Alternatively, will the dryer run if it is the only item plugged in via that RCD? If regularly used, that may do the trick; otherwise the problem will come back again. Alternatively go back to Hotpoint.

Clive

-------------------------
Clive S Carver GCGI IEng MIET MITP
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