IET logo
 
IET
Decrease font size
Increase font size
Topic Title: TT without a 60947/3 main switch
Topic Summary: Not seen one like that before
Created On: 13 November 2017 07:08 PM
Status: Read Only
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.
 13 November 2017 07:08 PM
User is offline View Users Profile Print this message



ady1

Posts: 832
Joined: 19 April 2005

Hi
I worked on a domestic installation where the main switch on a split board was basically replaced by a 100ma time delay RCCB.
Is this ok, as thinking about it - its still double pole whole board isolation and it doesn't trip when testing the 30ma side of the board?
Any thoughts?
Regards
Ady

-------------------------
Resistance is futile.
 13 November 2017 07:30 PM
User is offline View Users Profile Print this message



dustydazzler

Posts: 1449
Joined: 19 January 2016

That's how they used to be
 13 November 2017 07:37 PM
User is offline View Users Profile Print this message



ady1

Posts: 832
Joined: 19 April 2005

So, not that i'm doing an EICR but if I was, I presume therefore it would warrant no code either?
Regards
Ady

-------------------------
Resistance is futile.
 13 November 2017 08:07 PM
User is offline View Users Profile Print this message



dustydazzler

Posts: 1449
Joined: 19 January 2016

Depends
I guess

This will probably get various conflicting answers
 13 November 2017 08:40 PM
User is online View Users Profile Print this message



geoffsd

Posts: 1760
Joined: 15 June 2010

Think about how you would connect a 'main' switch if there was one as well.

It would be pretty pointless, wouldn't it?
 13 November 2017 09:27 PM
User is offline View Users Profile Print this message



daveparry1

Posts: 7745
Joined: 04 July 2007

Sounds good to me.
 13 November 2017 09:45 PM
User is online View Users Profile Print this message



mapj1

Posts: 9568
Joined: 22 July 2004

I've fitted an odd one or two like that. In the days of the plastic CU and before the change to dual RCD boards, it was one of the options that Hagar among other makers recommended as a one box TT solution.
The RCD is the double pole main switch. Has the right contact gaps so long as it is marked as EN 61008 from the notes.

-------------------------
regards Mike
 13 November 2017 10:50 PM
User is offline View Users Profile Print this message



geov

Posts: 391
Joined: 22 February 2004

Additional protection?
 13 November 2017 11:36 PM
User is offline View Users Profile Print this message



Alcomax

Posts: 248
Joined: 12 November 2009

Nothing wrong with that arrangement. Nice and flexible design. You can have an rcbo if your new work requires additional protection.
 14 November 2017 08:58 AM
User is offline View Users Profile Print this message



daveparry1

Posts: 7745
Joined: 04 July 2007

Ady mentioned "the 30m/a rcd side of the board" so it seems there are rcd's there.
 14 November 2017 09:16 AM
User is offline View Users Profile Print this message



geov

Posts: 391
Joined: 22 February 2004

Note to self - must read OP more carefully!
 14 November 2017 11:11 AM
User is online View Users Profile Print this message



AJJewsbury

Posts: 16007
Joined: 13 August 2003

So, not that i'm doing an EICR but if I was, I presume therefore it would warrant no code either?

Nothing wrong at all with a 100mA S-type front-end RCCB.

Only reason for coding I could think of would be if it was a metal CU and all the wiring on the supply side of the RCCB wasn't class II. (My personal preference would be for the 100mA to be in its own insulating enclosure before the CU.)

- Andy.
 15 November 2017 09:23 AM
User is offline View Users Profile Print this message



ady1

Posts: 832
Joined: 19 April 2005

Thankyou for the replies.
I just had not seen it before (hardly any TTs around), but at the same time I couldn't fault it.
Maybe only that it was labelled main switch and its actually RCD Main Switch.... yep, I need to get a life
Regards
Ady

-------------------------
Resistance is futile.
Statistics

New here?


See Also:



FuseTalk Standard Edition v3.2 - © 1999-2017 FuseTalk Inc. All rights reserved.

..