Garage ring or spur?

[John Burns]

And a wild statement back from you
They only catch the arcs that meet the right arc signature

AFDD's can be prone to nuisance tripping due to noise on the mains but how do you positively identify the cause
To rectify the problem, Do you replace the AFDD or do you rewire the circuit or do you do both as talking to a few test equipment manufacturers it is unlikely to be picked up by any of the test equipment currently in use

My AFDD has not done no such things. They are not useless and actually do what they say they do.

 

[John Burns]

The one with the Hager AFDDs failing to trip because they were designed to pass against a different trip method?

The problem with My Savery, is while he quite often has something worthwhile to say and can be funny with it too - he drags it out for for too long that I'm starting to fall alseep by the time he has made the point!

He tested the Siemens which appeared to work on his Heath Robinson test setup.

 

[SPECIAL LOCATION]

You are just going by what the regs say, which do say they recommend AFDDs on all socket circuits.

I think you forget to mention the other bit that the regs say......
e.g. "Recommend" see page 18... This is one of several possibilities without mentioning or excluding others.

i.e. It is NOT essential and it is NOT a requirement for the type of installation that the OP is enquiring about..

All you appear to be doing is taking another thread Off-Topic, without any constructive advice to the original question...

You are perfectly within your rights to state how much you like AFDD's and how many times you have installed them..
and how much safer you think they make your circuits... BUT.... they are NOT required for this alteration. FACT!

And to state that you consider them essential only illustrates a limited real-world experience of typical domestic installations.

Plus other equally, (or more), competent, trained, skilled, experienced, knowledgeable, qualified persons.. (some of whom may be on this forum).. are also able to design, install, test, inspect, certify and/or advise others about circuit additions & alterations that fully comply with BS7671 and meet ALL of the fundamental principals summarised in Chapter 13, for safe electrical installations that will not endanger people property or livestock... (which is the root foundation for the rest of BS7671)... without agreeing with your personal preferences..

It is best to keep answers to BS7671 fact.. Rather than any personal preferences....

Otherwise we could end up with people saying garage electrical alterations should be done in a mini-skirt, wearing roller-skates, dancing the birdie-song, playing Bert Weedon easy guitar chords, and eating a Greggs sausage roll... because that is what they find comforting!!!

 

[UNG]

My AFDD has not done no such things. They are not useless and actually do what they say they do.

What real world actual proof do you have that it is or are you just making an assumption

The US has been using AFCI's for many years and they don't get many if any good reports

 

[John Burns]

I think you forget to mention the other bit that the regs say......
e.g. "Recommend" see page 18... This is one of several possibilities without mentioning or excluding others.

i.e. It is NOT essential and it is NOT a requirement for the type of installation that the OP is enquiring about..

All you appear to be doing is taking another thread Off-Topic, without any constructive advice to the original question...

You are perfectly within your rights to state how much you like AFDD's and how many times you have installed them..
and how much safer you think they make your circuits... BUT.... they are NOT required for this alteration. FACT!

And to state that you consider them essential only illustrates a limited real-world experience of typical domestic installations.

Plus other equally, (or more), competent, trained, skilled, experienced, knowledgeable, qualified persons.. (some of whom may be on this forum).. are also able to design, install, test, inspect, certify and/or advise others about circuit additions & alterations that fully comply with BS7671 and meet ALL of the fundamental principals summarised in Chapter 13, for safe electrical installations that will not endanger people property or livestock... (which is the root foundation for the rest of BS7671)... without agreeing with your personal preferences..

It is best to keep answers to BS7671 fact.. Rather than any personal preferences....

Otherwise we could end up with people saying garage electrical alterations should be done in a mini-skirt, wearing roller-skates, dancing the birdie-song, playing Bert Weedon easy guitar chords, and eating a Greggs sausage roll... because that is what they find comforting!!!

The original post:
Hi, I have an existing spur going to my garage to an old fuse box which supply's one socket and a light. I want to add another 3 double sockets, one one each wall. Is there any advantage in making this a ring back to the fuse box when it's on a spur from the house?

1) The old garage box is best being replaced.
2) The garage is on a spur.
3) He is asking is there an advantage in taking the garage feed back to the Consumer unit.

i) Best replace the old garage fuse box with new a garage unit with circuits for lights and sockets - obvious.
ii) It is clearly better all around taking the garage supply back to the CU. Divide and rule by giving it its own circuit.
iii) Additionally while doing this work, it is best to have the best protection.
Iv) Good protection is RCBO or the best, AFDD.

That is the way he should go having a safe and sound garage setup.

 

[John Burns]

What real world actual proof do you have that it is or are you just making an assumption

The US has been using AFCI's for many years and they don't get many if any good reports

I have experience of US systems. It is like going back to the 1940/50s. They have two voltages run into a domestic house, with separate sockets for each, and receptacles (sockets and plugs) that are terrifying. Wirenuts are common - no kidding. Their appliances, especially the legacy laundry appliances are built down to a price, and fully of old hat crude heavy switches and contacts which can cause an arc. They have no switches on the sockets - antiquated being introduced in 1919. They pull the appliance cord to remove the plug causing arcs. You can see the flash as they pull the cord out.

The 120v side of the system draws 25A for a 3kW appliance, UK is about 13A, which makes matters worse as there are heavy current draws.

AFDDs work. BTW, they have a test button. Do not go on myth.

 

[binky]

Yes a Heath Robinson testing affair. Makers all say there is a difference between an arc and spark.

not seen that video, but AFDDs have been proven not to work well on ring circuits.

 

[UNG]

AFDDs work. BTW, they have a test button.

RCD's and RCBO's have a test button but on closer inspection with the appropriate tester they can be found to be out of spec like many I have found over many years in one case an RCD I had fitted 6 months earlier which tested ok when installed didn't test ok when I was doing some other work at the property

Until I can add a sensibly priced AFDD tester to my arsenal of test kit and definitively prove it's functionality externally then I don't see the value in having one yes it has a test button but does that sufficiently prove it is working and will work if an arc of the correct pre programmed signature and magnitude occurs

Do not go on myth.

I don't unlike you with the total blind faith that you run with

 

[John Burns]

RCD's and RCBO's have a test button but on closer inspection with the appropriate tester they can be found to be out of spec like many I have found over many years in one case an RCD I had fitted 6 months earlier which tested ok when installed didn't test ok when I was doing some other work at the property

Until I can add a sensibly priced AFDD tester to my arsenal of test kit and definitively prove it's functionality externally then I don't see the value in having one yes it has a test button but does that sufficiently prove it is working and will work if an arc of the correct pre programmed signature and magnitude occurs

I don't unlike you with the total blind faith that you run with

AFDDs work. Do not go on myth.

 

[John Burns]

not seen that video, but AFDDs have been proven not to work well on ring circuits.

Source? proof?

 

[UNG]

AFDDs work. Do not go on myth.

Where is your

Source? proof?

That they do

 

[John Burns]

Where is your

That they do

AFDDS are mandatory in a number of situations and recommend by the regs. They have been on sale for a number of years now with 100,000 of them being fitted. The onus is on you substantial your accusations. Use only professional attributed sources please.

 

[Murdoch]

AFDDS are mandatory in a number of situations and recommend by the regs. They have been on sale for a number of years now with 100,000 of them being fitted. The onus is on you substantial you accusations.

Mandatory in some situations ................... recommend does not mean necessary AND lots of CU's can't accommodate them so you recommend a new CU too?

 

[John Burns]

Sharpen up. In many mandatory situation a new CU will be needed. Where recommended it is then a valued judgement to fit a new CU - if one is needed of course.

BTW, a side issue: a CU that cannot accommodate an AFDD cannot hold an RCBO either. Such a unit is worthy of replacement.

 

[Murdoch]

Sharpen up. In any mandatory situation a new CU will be needed.

WRONG

Lots of more recent CU's can accommodate AFDD's

 

[John Burns]

RIGHT! If the CU cannot hold an AFDD in situations where they are mandatory, it will need replacing, or a separate unit installed. The AFDD must be fitted irrespective.

 

[John Burns]

Back on topic, all the points I recommended in post 25 matter:

https://electricianforum.co.uk/threads/garage-ring-or-spur.57629/post-557415i

 

[Murdoch]

RIGHT! If the CU cannot hold an AFDD in situations where they are mandatory, it will need replacing, or a separate unit installed.

That's better and far less misleading for people viewing this thread.

 

[John Burns]

What I wrote was clearly obvious. If an AFDD is mandatory then it must be accommodated no matter how. They should be fitted in normal practice, as RCDs were at one time, as AFDDs are recommended on all socket circuits by the regs. Also a responsible electrician would fit an AFDD on a heavy current appliance such as a shower were scorch marks and meting insulation are seen regularly on the connection terminals.

 

[Murdoch]

What I wrote was clearly obvious. If an AFDD is mandatory then it must be accommodated no matter how. They should be fitted in normal practice, as RCDs were at one time, as AFDDs are recommended on all socket circuits by the regs. Also a responsible electrician would fit an AFDD on a heavy current appliance such as a shower were scorch marks and meting insulation are seen regularly on the connection terminals.

Recommend does not say must be FITTED

So for clarity for poor homeowners any spark saying that they are recommended and must be fitted should be shown the door .......

As for showers , HUM, older boards trip when the insulation melts and creates a short.

Thread unlocked, John Burns will not be replying.