Ring testing

[kingeri]

First establish whether it's a ring or a radial, then if it's a radial, establish if the CCC is adequate to be protected by a 32a breaker. Having 'two radials' in one breaker isn't an entirely accurate statement either, it is one radial circuit with two branches, and although perhaps not always the best practice, it can be done with the blessing of the IET. For all you know, one of those cables might only supply one double socket!

 

[Gnasher]

How many 4mm cables are in MCB?

Cant vote for either. Option 1, i assume you have 2 x 4mm cables, and instead of testing it properly to find out, you are guessing..

Option 2, gives me the impression that you don't really understand what you are doing.

You will get some real flack in response to this post.

Cheers...........Howard

the point I am making is that until you do an ring end to end you must assume it is a ring.

 

[telectrix]

the point I am making is that until you do an ring end to end you must assume it is a ring.

cobblers. until you test it you can't assume anything other than that there are 2 cables in 1 breaker.

 

[Gnasher]

cobblers. until you test it you can't assume anything other than that there are 2 cables in 1 breaker.

By assuming that it is a ring the first test you would carry out is a ring continuity test
This will prove if it is or is not a ring.
Once you have done you then decide on your next test.

If you do not assume it is not a ring what would be your first instinctive test?

 

[Octopus]

By assuming that it is a ring the first test you would carry out is a ring continuity test
This will prove if it is or is not a ring.
Once you have done you then decide on your next test.

If you do not assume it is not a ring what would be your first instinctive test?

My first instinst says that the OP doesn't know what he's doing

 

[Gnasher]

My first instinst says that the OP doesn't know what he's doing

My first instinst says that the OP doesn't know what he's doing

Hi Murdoch
i have been testing for years the problem I am having is that when you enter into a discussion with others who are a very set in there ways it is very difficult to get your point across especially when it is you against 3 of them. My intention was to post in a manner to create discussion that would help with my point of view. Most of the replays tend to agree with what I am saying.
That is that you must carry out the correct tests that will determine what is in front of you. As a tester you should have an above average level of knowledge and experience, this will allow you to understand that because the BGB states that a 4mm can carry 32A you still need to be able to understand and make allowances for correction factors that will down rate the CCC of conductors, all of a sudden a 32A MCB is to large to protect the conductor. It still worries me the amount of testers who do not understand this. We are not designers but we should have an understanding of the principles to aid in our decision making.
Not an easy job perhaps that's why the 2391 had the largest fail rate of all G&G exams

 

[UNG]

It still worries me the amount of testers who do not understand this. We are not designers but we should have an understanding of the principles to aid in our decision making.
Not an easy job perhaps that's why the 2391 had the largest fail rate of all G&G exams

An electrician with no idea of circuit design should not be doing the job. I think this is one of the most basic things that electrician needs to know not just have an understanding of it or how do they install a new circuit

With regards to the 2391 if you put enough inexperienced people through the exam then the fail rate will be high, when I sat the exam there were some who were having their 3rd, 4th or 5th attempt at it, some left after an hour I would be surprised if more than 50% passed on that day. It will be interesting how the replacements for the 2391 will fare and if the overall pass rate is higher then it will be interesting to make comparisons as to whether another dumbing down has occurred within the industry

 

[Silly Sausage]

2395 Pass rate:
April 2012 - 49%
June 2012 - 24%

Not a walkover then...

http://www.google.co.uk/url?sa=t&rc...FAcMOyfpDi3ikJQ&bvm=bv.42553238,d.ZG4&cad=rja