IET logo
 
IET
Decrease font size
Increase font size
Topic Title: Old merging with new
Topic Summary:
Created On: 23 July 2013 09:03 PM
Status: Post and Reply
Linear : Threading : Single : Branch
Search Topic Search Topic
Topic Tools Topic Tools
View similar topics View similar topics
View topic in raw text format. Print this topic.
 23 July 2013 09:03 PM
User is offline View Users Profile Print this message



jcm256

Posts: 1941
Joined: 01 April 2006

Up front 100amp fault voltage operated protective device, said no can do to installing socket with integral RCD in garage for outdoor protection hedge trimmer, electric mower. What I mean is a professional physically replacing a standard socket (actually screwing to wall etc). Use a portable RCD then there is no comeback on the electrician. However, portable RCD be frowned upon be HSE especially with Stm/HP washers. Of course, one other solution would be to replace FVOD by RCD or a dual RCD consumer unit, but has not the money to do this. There are still thousands of FVOD in use around the country therefore would think there would be some mention in the present wiring regulations about installing RCD in series with FVOD. Except maybe 551.4.1 (more or less say watch it)

Any thoughts,

jcm
 23 July 2013 09:12 PM
User is offline View Users Profile Print this message



perspicacious

Posts: 7267
Joined: 18 April 2006

" Except maybe 551.4.1 (more or less say watch it) "

Isn't that specific to low voltage generating sets?

As to the use of a FVOELCB, has anyone got a calibrated tester for these?

Regards

BOD
 23 July 2013 09:41 PM
User is offline View Users Profile Print this message



alanblaby

Posts: 402
Joined: 09 March 2012

Why not a RCD socket outlet?
Cheap ones are £17 ish, so by far the easiest and cheapest way to comply (if cable runs permit).

411.3.3 is the most relevant here, you have little choice but to provide RCD protection for a newly installed socket outlet.
 23 July 2013 10:50 PM
User is offline View Users Profile Print this message



jcm256

Posts: 1941
Joined: 01 April 2006

Thanks for that reply. It was not the cost of the RCD socket, but the fact that the only connection to the earth electrode (TT system), is through the voltage sensitive element (coil) of FVOD. Would work as a through earth path for the RCD provided the FVOD internal sensitive element remained intact. What electrician would allow any device to be in the circuit path to the electrode? Anyone can buy a portable RCD; the electrician does not have to touch it, so therefore not liable for bad practice.
Thanks,
jcm
 25 July 2013 12:08 PM
User is offline View Users Profile Print this message



deejackson

Posts: 267
Joined: 13 May 2005

In 99% of cases I see of voltage operated elcbs the voltage sensing function is effectively shorted by the immersion heater cpc linking the earth of the system to ground via the plumbing system - so the chance of it tripping in a fault scenario is minimal. If you can't persuade the customer to change to an RCD instead then you could TT just the RCD socket you're installing with its own rod - making sure that you isolate from the rest of the system earth - and label/document well.

Dee
Statistics

See Also:



FuseTalk Standard Edition v3.2 - © 1999-2014 FuseTalk Inc. All rights reserved.