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To determine if an metal work is classed as an extraneous conductive parts then I understand that a test is to be carried out between the metal work in questions and the MET. I know as a general rule if the reading comes back as 22Kohms of higher then the part doesn’t need bonding, however some...

I understand that for a TN system it is 0.4 max disconnection time.    If for a distribution circuit you are allowed 5s max disconnection time, does that mean if you have a garage consumer unit on a MCB of the house consumer unit does that make the circuit a distribution circuit serving the...

Is it possible to add a non protected MCB to a duel RCD Board. A non protected circuit would serve a mini garage board that has its own RCD. The chap i was with today was quoting to put a garage feed up to the top of the garage. He said that as they have a Duel RCD board it can’t be done and...

Max demand  Am I right is thinking if I wanted to work out the max demand of an install the following would be a good rule of thumb.  40 A - cooker  32A - ring  32A - ring  6A - lights  20A - radial  32A - ring  6A - lights  6A - smoke  40 + (0.4 x 32+32+6 + 20 + 32 + 6 + 6 ) = 93.6A...

If you have a 10mm2 SWA that needs to come back to the main consumer unit but it would be a nightmare to gland into the consumer unit because it only has the Hager Square knock outs - would it be acceptable to terminate the SWA into a switch fuse then run a 10mm2 T+ E back to the board on a MCB...

Was helping to install some interlinking heat/smoke alarms in a house yesterday. They were just off the lighting circuit and no new circuit needed. I know normally that if something is installed on a existing circuit and not in a special location it doesn't need to be notified. However the guy I...

We had a situation at work where a customer had a FCU fitted in the back garden after he had a house renovation. He planned to have power to his shed down the bottom of the garden.    He took the ZS from the FCU and it was 1.08 ohms. This means that adding 25m of cable would take it over the...

Hi chaps have very little experience with EICR’s but started to follow round someone at work doing.    just a quick one - He wrote down LIM on both lighting circuits for r1 + r2 and Zs because he said they were awkward to access. Is this the one thing. Or should LIM only be used when you...

I know that in a domestic premises all sockets must be RCD protected. if the job was to move some sockets slightly, if a customer doesn't have RCD protection at the board and they don't want the board changed then the only option is a to have incorporated RCD sockets or RCD fused spur?  I was...

Would I be correct in stating that the following 2 items below do not need to be notified. These would also just be classed as minor works ?  Installing outside lights that don’t require a new circuit but will be fed via a fused spur.  If you are changing a light or Fan etc in a bathroom. Just...

Whenever you install an item outside ( or special location ) should you drill a drain hole in the enclosure. I’m conflicted about this. Some the chaps at work do some don’t.    1. If you don’t drill a hole then condensation can build up. 2. If you do drill a hole then the enclosure is in...

I went out today with one of the lads who was asked to change a customer to tn-c-s from tn-s. The DNO had just put in a new service head and this one had an active PME. The chap just removed the earthing conductor of the sheath of the cable and put it into the service head to move the customers...

Hi Chaps was installing Down lights today with one of the electricians. The lights in question were 8 spotlights that only required a L & N. Because of this the supply to the lights was ran to a wago junction box and the sparky ran 2 core ( no earth ) from the supply wago box to each...

Hi Chaps I Just wanted to check something. If you have an outbuilding that has an RCD board ( 30mA)  installed and then it runs back to the house on a main switch RCD (also 30mA) that is connected to a Henley block would this be OK ? I know both might trip but that wouldn't be a issue for...

Quick question on volt drop.  If you run power to an outbuilding ( single phase) when calculating volt drop would you allow the 5% for general or 3% for lighting. The outbuilding would have lighting in it but when I asked the question the chap I worked with he said you allow 5% as it’s not...

Hi all we were looking at a job today where the customer wants to have a garage consumer unit from sockets and lights. The main house board has a spare way before the RCD with a convenient 32a MCB unused :)  I suggested to chap I was working with to have an SWA from the board at the 32a breaker...

Hey chaps was on a job today where the guy I was with was installing a hob. It was one that had a L1 & L2, N & E.  He wired it in and then later had a message from the customer saying one 2 or 4 rings heat up. It turned out he only connected the L1 to the connection unit. It was a 4...

In regards to SPD in a house. If a customer doesn’t want to pay the extra we can’t force them. I had a spark tell me that under the 18th edition SPD must be fitted even in a house and if not a risk assessment should be carried out.    however I thought that in a single house SPD does not have...

Hi chaps just wondering if you could clarify the following ….. If you have added a new circuit to a board when it comes to the sticker you put on/near the board with all the information I.e ….  Circuit number  Type of wiring  Number of points served  Conductor size Max disconnect etc  As...

Hey Chaps I know with the 18th edition we have to use metal fixings for cables as well as plastic in case of premature collapse.    If say the cable was run in PVC conduit in a wooden summer house would this still be the case ? A: it’s made of wood B: It’s not the main house  I know you can...