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mains

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  1. jackhammerJIM

    Commercial sub mains exceed max zs of mccbs

    Thoughts required on todays scenario . Commercial premises fed from 100 amp 3 phase TNS supply ZE 0.40 feeds 80 amp 3 phase switch fuse (max zs 0.57) feeds 400 amp mainswitch protek panel in 35mm swa 16mm earth 125 amp mccb (0.24 max zs) submain exceeds max zs at 0.57 Had this down as a...
  2. K

    Remote mains switching/control options?

    Hello there, I have a property located in a very rural area that's only partly occupied, its also rented out for short periods. I live 2 hours drive from the property and the issue I have is that people keep leaving electrical items switched on which of course poses a huge fire risk. It can be...
  3. T

    30 Amps DP mains supply concern

    Note: I am not an electrician. I have a large house that has been divided into 4 flats with an additional landlord supply, so 5 meters in total (2 smart meters, 3 dump meters). I recently noticed that there was damage to one of the supply side fuses. I called UK Power Networks who came and...
  4. L

    To connect old turntable to mains earth or not?

    Hi Guys, I am renovating an old vinyl turntable (Thorens TD-150 mkII is anyone cares) It is fitted with a 2-core mains cable, but there are lots of metal parts including sub-chassis and a 240v motor! Normally this is all earthed via the amplifier (phono leads), but I have swapped the 2-core for...
  5. J

    Mains cable blown out on two products

    Hello, Could anyone please identify what has caused this kind of blow-out on a 3-core flex? One is from an electric blanket and one from a heated pillow type thing. I think both cables are the same though, probably the same factory. The 500mA fast-blow fuses inside the controllers and the 3A...
  6. adamfromayr

    Powder coat oven keeps tripping mains rcd all off a sudden?

    Hi Okay my powder coat oven i built was fine until today! I had it working kept on for more than an hour etc Pretty pleased with it all 2 x 2000w elements fitted and then wired into a 32a blue socket to the 42a isolator switch But today its started tripping i looked insid emy control panel...
  7. R

    Gas cooker - mains lead for ignition and clock

    I have just replaced my electric cooker for gas and now have the lead for the ignition and clock training along the worktop to the cooker isolater on the wall. I am capable of doing the following, but would like confirmation. I cannot just cut off the plug and wire directly into the dedicated...
  8. S

    Installing Mains Powered Home Automation Zigbee Wireless Repeaters

    Hi If this is in the wrong forum please feel free to move. I need to have installed around 20 Zigbee Wireless Repeaters around a large property. They are 40mm x 40mm x 20mm and require a 230v supply, current is minimal. I wondered if the following scenarios are feasible and acceptable within...
  9. A

    Residual Current on Mains Tails - Installation Disconnected.

    I bought a new MFT1710 a couple of weeks ago and got a free clamp meter with it. (UNI-T UT210B, 200A Mini Clamp Meter). I finally got it out the box today and thought I'd try it on my mains tails to see if/how it's working. Surprisingly, with the consumer unit main-switch off, and the main...
  10. C

    Large 1940s mains upgrade

    upgrade to a 1940s ish installation mains busbar due to soldered joints failing on busbar isolator, 20 ish switched fuses of the same age on it. Large installation(hotel) that never closes and has alot of c1s on existing out of date certs but they want the mains upgrading 1st before the rest of...
  11. OttoF

    How to tell if mains sockets are on same circuit?

    Is there a safe and easy (but also precise) way to tell if two separate mains sockets are on the same circuit? I need to know because I'm trying to use existing mains circuitry to create an ethernet network in a communal area of a multistorey block of flats, using Powerline Adapters...
  12. J

    RS Solutions Mainslink 500m wireless mains to mains discount code

    Hi Guys, New to the forum, so first post. I need to purchase one of these Mainslink 500 m wireless jobies as communications cable between boiler and central heating has been cut and instead of re-running the cable, this seems to do the job. Has anyone used one of these Mainslink wireless...
  13. S

    Mains Powered Medical Headlamp repair query

    Dear Electricians, I am a veterinary surgeon and need help from someone in the know as to how to bring an old bit of equipment back to life. It is a headmounted lamp with a special mirror to allow examination of the retinas of dogs and cats, however my query relates to the power supply for the...
  14. P

    Mains isolator query

    A fellow electrician wants to install a 100A isolator switch between the meter and cu. Is it correct that this also has to be metal as per 3rd ammendment. The wylex rec2 is plastic so does it need to be changed. Of you could share your expertise please.
  15. M

    Converting mains for Nest Thermostat HELP

    Hi, I was hoping someone could help me. I have recently brought a 3rd gen nest and installed it myself. I am currently using the usb stand however I want to mount the thermostat on the wall. I can't run cable from heatlink to thermostat, not possible. However in the kitchen near to a light...
  16. John oakley

    Removal of PIR from circuit

    so I have an porch wall light that is switched inside the house which has a separate PIR outside the porch. I am removing the PIR completely (as it no longer was switching the porch light on so assumed the pir was defective as the external floodlight on the same pir wiring (next paragraph) is...
  17. diyterry

    Are mains sockets permitted in bathrooms?

    Hello. I am extending my bathroom, but one of the walls that will be incorporated into the bathroom has a socket fitted. Is this allowed in a bathroom or is it best to remove the socket and fit a cover?
  18. Mark42

    3-Ph sub-mains on four 16mm DI singles. OK or not?

    I'm upgrading an existing installation in my own house, and would like a second opinion please. An existing sub-main, in a separate building about 10m from the supply is fed via four existing 16mm DI meter tail cables in cable tray and conduit. I inherited this installation from when the very...
  19. S

    Re rerouting mains and dno responsibility

    Good afternoon all, I have a client that is having works done on there front drive and the landscaper has stumbled across the mains supply cable 20cm or so in the ground. Unfortunately the cable is too high up to be able to high up and needs to be moved down, I had advised my client to talk...
  20. Leesparkykent

    Block of flats mains room location.

    I'm starting a block of 15 flats Wednesday, the building is being converted from an old care home. The original wooden staircase is staying in place throughout in the communal area. I've just received a revised set of drawings which shows the mains room mostly situated under the staircase...

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