ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
AreMetal Ladders Ever OK For Electrical Work?
by jwes2699. 01/21/18 05:58 PM
VDE 0100 to introduce AFCIs
by sparky. 01/20/18 05:09 PM
MRI LED lights dimmer control replacement - wow!
by Potseal. 01/19/18 08:52 PM
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 15 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Failure rate of RCDs #193924
04/28/10 05:42 PM
04/28/10 05:42 PM
C
C-H  Offline OP
Member
Joined: Sep 2002
Posts: 1,497
Stockholm, Sweden
The Danish authorities have undertaken a large study of the realibility of RCDs in which hundreds of installations have been tested. From 2 to 10% of the units were found not to work as intended. Some passed the test button test, but failed to work when tested with proper equipment test. The failure rate was found to increase with age and brand name products were not immune to failure.

A comprehensive report in English is available at:

http://www.sik.dk/content/download/5099/71907/file/HPFI%20rapport%20-%20engelsk.pdf

Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Re: Failure rate of RCDs [Re: C-H] #193925
04/28/10 06:06 PM
04/28/10 06:06 PM
W
Wolfgang  Offline
Member
Joined: Sep 2005
Posts: 153
the very West of Germany
The main problem, I see, is not a failure rate of 10% after 10 years, because we can easily check these devices (as electricians), but what about fuses or breakers. There are so many out there, aged 30 or 40 years, but nobody can tell whether they will trip at the correct overcurrent value after such a long time.

Re: Failure rate of RCDs [Re: Wolfgang] #193936
04/29/10 09:05 AM
04/29/10 09:05 AM
T
Texas_Ranger  Offline
Member
Joined: Dec 2001
Posts: 2,409
Vienna, Austria
I haven't seen to many failed RCDs so far, and most failed on the safe side - tripped and couldn't be reset any more. Only one or two refused to trip, on one even the test resistor blew up spectacularly.

Same goes for MCBs, but I did encounter one very old range (Schrack HLS, manufacturing date stamp 1960) that refused to trip as a whole. There were a few dead shorts (faulty light socket) but the MCBs (10A H curve) never tripped before the 20A gL main fuse blew.

Re: Failure rate of RCDs [Re: Texas_Ranger] #193941
04/30/10 01:20 AM
04/30/10 01:20 AM
F
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
I haven't run into too many RCD failure in France unless you got a Le Cheapie or butched work on the RCD unit.

Yeah we do test the RCD but with older units it pretty tricky to get set up to function properly.

But with nice hevey bolted fault circuit then it is good time to replace the RCD I have deal with that due once you reset it it will never function correct.

Merci,Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
electure
electure
Fullerton, CA USA
Posts: 4,264
Joined: December 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 21
sparky 16
Potseal 15
Popular Topics(Views)
243,587 Are you busy
180,382 Re: Forum
170,859 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.014s Queries: 15 (0.003s) Memory: 0.9587 MB (Peak: 1.0924 MB) Zlib enabled. Server Time: 2018-01-22 04:39:14 UTC