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I have not said don't (as BAS used to say) just get to understand the basics to stay safe. After all, we all know what happens when you don't respect the dangers when facing electricity.

On page 5 in post #69. The last photo seems to show a lamp and LAP socket tester illuminated while the cover is off the CU. I am on a tablet, so not the largest image and I'm happy to stand corrected.

There is a flaw. If you size the cable in step 2, you can't apply the rating factors. The steps are as follows 1 calculate the load (Ib). 2 select the OPD. The rating is (In) 3 calculate the minimum current carrying capacity for the cable. If no rating factors are in play, this is the value...

The process is not quite correct. The steps are: calculate the load (26A in example); determine the OPD rating (must be at least 26A, so it is 32A); determine the cable size (must be at least 32A). The example has t&e, installed using Method C. In the relevant table in BS7671 4mm2 cable is...

back in the day Ban All Sheds used to post a library of publications and advise the poster to read them before undertaking electrical work. Before he left us, he posted this to just about everybody. In your case, he would have been right to advise you to read up. I did see JohnW2 advise you...

I don't know why my post was not clear to you. When I am called t quote for a CU change I explain to the customer that before I can energise a circuit I have to confirm it is safe. I then explain my working practice is t carry out a full inspection/test and produce an EICR. If I find serious...

I was replying to jc86 and merel referred to the amount of space above the lintel. There are 4 courses of brick with mortar courses, so around 300mm. If he is fitting joists and a ceiling, the lintel will be within the prescribed (not safe) zone of 150mm. If he is fitting a polycarb roof with...

Looking at your photo you appear to be outside the prescribed zone. You can run the cable above the lintel.

What size cable?

Jupiter, can I ask some questions please? Do you have a copy of the regs and/or OSG? What test kit do you own? Apologies if you have been asked this before and answered.

In my first year in the trade I did a CU swap without a pre-test. The downstairs ring had a break in the cpc. It was a big old house with loads of rooms and I lost a day tracing the cable. There were 2 breaks were the grub screw had broken the cable. One socket behind a fish tank and one behind...

Once the LABC accepts an application for work the LABC is responsible for site safety. And the LABC inspector was at first wanting to use a third party inspector at our expense even when my son and I both had C&G 2391 certificates. My son raised the question if the third party inspector did not...

I don't really understand this. LABC is only interested when installation work is carried out by a person who is not on the CPR (and not using 3rd party certification). If the property owner is not electrically qualified and cannot provide verifiable evidence of installation experience, LABC is...

Part P brought domestic electrical under the control of local councils and bears no relationship to commercial. Also, when a trading electrical works in either environment, all regulations (EAWR, HASAW, etc) apply with Part P only applying for domestic jobs. The rules changed to reduce the...

i commented on the EICR details Eric stated and Part P has no interest in inspections. As for installation, there will be an EIC and this has the edition of BS7671 on it. This will be the edition in effect when the job was certified. I agree it would be so much clearer for Part P to state the...

A LIM means there is an agreement between the client and the inspector that the item is out of scope for the inspection. AN FI means the inspector cannot inspect or test the item, but believes there is an issue. LIM and FI are nor the same thing. You regularly post this and it is wrong. An...

Have you considered sending it to a repair company. May save you having to scrap your tester.

The ring is protected by a 32A breaker and the cable rated at 54A (due to doubling up the 27A rating for the single cable). If the load is 50A and there is a break in the ring, the MCB trips after about 1 hour. In your design, the breaker would never trip. Do you think running 54A...

The simplest option is to extend the radial from socket 6 through to sockets 7,8 and 9 (given you were planning on making this a ring)

Does something that happened 49 years ago have any relevance when discussing actions being taken now?