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Hi All I have got to quote for a distribution circuit to a garage Cu. My Question is if you bury the cables in the wall how can you provide the 30mA protection required for that cable and still achieve discretion because the garage board will also have a 30mA RCD. Do you just provide the 30mA...

Business Name: Watts Electrical Business Address: 10 Langford Avenue Honiton Devon Business Telephone Number: 01404891786 Business Mobile Number: 07841630635 Business E-mail Address: [email protected] Business Website Address: - Work Covered: Domestic Installation Qualified...

I hadn't really thought about it as being one circuit. It goes to the conservatory and supplies two sockets but its new 2.5/1.5.

I only tested the ring that i installed the panel radiator on. Zs 0.6 ohms

Its ok with 1361's then?

Thanks for the replys. I think i'll put it in the comments and explain it to them. Slightly off topic i'm pretty sure it has 1mm cpc. r1 = 0.71ohms r2 = 1.76ohms 0.71 * 2.5 = 1.775ohms When did the 1mm cpc go out and does any one know what conditions it could be problematic. I know theres a...

Hi all, Just changed a heater for an old couple and when i went to test the circuit it became apparent that someones added another ring to the same fuse. Prop the people that put did the conservatory. :run I've advised them that it needs to be put on its own but thinking about it is it doing...

Thanks guys, some good points made. Now i'm really confused. Have to try and get my head round this later headbang

Lol sorry guys. Been thinking about it today and its the same estate my parents live on and i'm pretty sure its plastic to copper then the whole house is copper.Wet Fish

Thanks for your relpys. As it is just like for like: Replacing kitchen strip light and switch replacing Bathroom fan & replacing porch light i don't think i'll issue a mwc but i will explain the situation. Also iirc the water on the houses on the estate in question actually comes in in...

Hi all, Been to look at a job which is just a few like for likes and fault find. Whilst there i noticed that theres no bonding to the main water. I know its just like for like but if i want to issue a mwc then you cant tick the box that says "confirmation of adequecy of main protective...

Similar to mine

Thanks for you help guys. :) Just guessing that the cu is about 6 years old but the house is almost 200 years old so its been chopped and changed around quite a bit.

I haven't done the Zs tests yet just joined the cables together to make sure i've got cont before putting the ceiling up and hiding the JBs. All the walls need plastering yet. Done R1 + R2 though which was 0.39ohms. which is what i would have been expecting if r2 reading was correct in relation...

Centre section of the ring had been removed by a previous "electrician" because of a damaged cable in the wall i believe, spliting the ring in two! Wires were just terminated in two of the sockets! So i wasn't able to r2 test. No i havent replaced it all theres a lot thats inaccessable under...

Hi all, Altering a ring in an old house rewired about 6 years ago. Got the lounge ceiling down so replaced all the ring and used maintenance free JBs. Connected all the ends together and done end to end tests etc today before i replace the ceiling and got the following results: r1 = 0.59ohms...

Been thinking some more about this this morning and i came to the conclusion that as long as the measured Zs past the FCU is still within the reqirements ie 1.16ohms then fault protection will still be provided by the 32A MCB and Overcurrent by the fuse in the FCU. All seems so much clearer the...

Thanks guys. How would this be recorded on the EIC as although its kind of treated as a different circuit its also the same circuit?

Hi, i did a cu change today where the garage has been converted into a room and the lighting has been taken from the ring via FCU. My question is, do you use the Zs upto the the FCU for the MCB for that circuit as norm, then relate the Zs past the FCU to the fuse in the FCU as thats what...

I've done the calculation again this time using t = 0.01 which is more realistic for an pefc of 3.2kA than the 0.1 which is the min BRB Ap 3 goes down to and got a result of 2.2mm2. So it looks like the 6mm would be fine:put the kettle on Any comments?