The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 10
Texas_Ranger 8
Trumpy 8
sparkyinak 7
Who's Online
1 registered (LongRunner), 206 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 6 1 2 3 4 5 6 >
Topic Options
Rate This Topic
#143839 - 09/15/05 06:58 AM UK cooker/RCD problem
agaricus bisporus Offline
Junior Member

Registered: 09/15/05
Posts: 2
Loc: uk
I have an old but virtually unused AEG cooker. When a ring or oven/grill is switched on the RCD trips after about half a minute. Even if the ring is turned off it will not then reset. After a couple of hours however the cooker works for 30 seconds, then trips off. Checks with a multimeter reveal no obvious anomalies.

Is this a common problem? Can it be fixed?

Top
Test Equipment:

Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement

#143840 - 09/15/05 07:47 AM Re: UK cooker/RCD problem
aland Offline
Member

Registered: 05/20/04
Posts: 187
Loc: United Kingdom
Sounds like an element fault, probably registering through the neutral to the elements. Multi-meter as useful as a chocolate tea pot. You need insulation tester to show fault up. Sounds like a job for an electrician not recomended for the DIY.

Top
#143841 - 09/15/05 01:03 PM Re: UK cooker/RCD problem
gideonr Offline
Member

Registered: 12/18/04
Posts: 152
Loc: Edinburgh, Scotland, UK
Can also be insulation failure elsewhere in the cooker, or even in the wiring to the cooker, triggered by a temperature rise... ...I'd stop using this cooker!

As it's not just one ring causing the trip, I'm doubting an element fault.

Edit: Duh, you can only use it for 30 secs anyway!


[This message has been edited by gideonr (edited 09-15-2005).]

Top
#143842 - 09/15/05 02:19 PM Re: UK cooker/RCD problem
Paulusgnome Offline
Member

Registered: 06/15/04
Posts: 56
Loc: Christchurch, New Zealand
An interesting problem this.
In NZ and Australia the wiring regs exempt cookers and ranges from requiring RCD protection, and I have always assumed that the reasoning for this is that cooker elements have a naturally high earth leakage current. This makes some sense, as elements constructed with a conductive core and sheath separated by mineral insulation which seems like a good recipe for high leakage.
Can agaricus bisporus advise us is the RCD required by code? If not, then the best bet may well be to remove it.
_________________________
Mark aka Paulus

Top
#143843 - 09/15/05 05:17 PM Re: UK cooker/RCD problem
agaricus bisporus Offline
Junior Member

Registered: 09/15/05
Posts: 2
Loc: uk
Thanks for the replies everyone.
Can't see it as a result of thermal changes in the general fabric of the cooker as it seems to happen within the same timespan regardless of whatever unit is energised.

No regs require an RCD, just seems prudent - and no, I'm not a professional electrician and I won't risk aq dodgy cooker if the RCD says it doesn't like it. Sad thing is my gut feeling is there's nothing wrong with the cooker and the RCD is being overly sensitive. Don't want to trash a good cooker for that reason.

Additionally I now use on the same circuit, a Baby Belling that used to fire the RCD in my parent's house but works as good as gold next to this damn AEG cooker...

Ain't no continuity here..!

Top
#143844 - 09/16/05 12:25 AM Re: UK cooker/RCD problem
aland Offline
Member

Registered: 05/20/04
Posts: 187
Loc: United Kingdom
AB this is why you need a sparky! He will have all the right equipment to test both the RcD and the cooker. Very sensible not to remove the RCD until you have proof that its faulty. Please! get them checked out.

Top
#143845 - 09/16/05 10:41 AM Re: UK cooker/RCD problem
Texas_Ranger Offline
Member

Registered: 12/17/01
Posts: 2343
Loc: Vienna, Austria
A good sparky should have a nice big tester that can tell if your cooker is faulty or your wiring and besides can measure and draw up a graphic trip curve of your RCD.

Top
#143846 - 09/17/05 12:32 AM Re: UK cooker/RCD problem
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
I'm with the majority here,
It could be to do with moisture, but you really don't know.
A-B, take our advice and get a good Electrician.
Best of luck, mate!.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

Top
#143847 - 09/17/05 08:05 AM Re: UK cooker/RCD problem
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
Yep, it's hard to really be any more specific without testing.

I'd have my megger (high-voltage insulation tester) on the stove to check for leakage, then with the back removed isolate each section in turn and test again to localize the problem.

Top
#143848 - 09/19/05 01:11 AM Re: UK cooker/RCD problem
djk Offline
Member

Registered: 12/26/02
Posts: 1269
Loc: Ireland
While an RCD isn't required by the regs, a 30mA RCD shouldn't really trip with a modern cooker.

I would be particularly concerned if the element tripping the RCD is a halogen / burried in a ceramic hob.

It's well worth getting it professionally checked out.

Top
Page 1 of 6 1 2 3 4 5 6 >



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals