electrical wiring | Page 2

electrical wiring

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  1. L

    Why does GFCI trip when running 110 and 220 through same conduit?

    I am currently working on wiring a hot tub. I currently have a 50a subpanel with 2 breakers(2 pole 30A and a 1 pole 20a). The wires I am using to run to the tub are THHN wires and are 10awg for the 220v, and 12awg for the 110v. The heater for the tub runs on 220v and the circulation pump, jet...
  2. D

    100 mA RCD

    What is the purpose of 100 mA RCD ? Where is requied ?
  3. W

    Testing requirements after GPO replacement in a caravan.

    Im not so much up to date with Australian standards in regards to domestic installations. I know about testing requirements after a full installation and I know that there is an actual as 3001 for caravans but I just want to check what testing would be required after say an caravan aircon...
  4. Lister1987

    Electrical Accidents that 'helped' change the wiring regulations?

    A post on a thread by @pc1966 got me pondering (post mentioned the Emma Shaw case), what other electrical accidents, fatalities, near misses that given rise to the regulations changing?
  5. C

    Earthing Table

    How is this earthing table derived and what would it apply to?
  6. Pretty Mouth

    Supplementary bonding requirements

    Evening All. I've been having a debate (argument) on a FB group with another well respected spark, and my old tutor. The subject of discussion - supplementary bonding. Their opinion is that it is required throughout an installation, where ever the conditions in 415.2.2 cannot be met without...
  7. P

    bathroom extractor fan internal grille - fire rated?

    Good Evening, I'm going to fit a 4 inch inline extractor fan in the loft above the bathroom. I'm guessing the internal grille has to be fire rated just like a down lighter has to be? i only ask because the website i bought it off doesn't sell any fire rated internal grilles even though it...
  8. K

    Taking 25mm tails over 3 metres

    Hi all, This week while wiring a very old farmhouse for heaters I noticed the incoming cu tails were very long, around 20 metres from the fuse and meter which is located in an adjacent farm building to the house.25mm tails (double insulated) leave the meter and go into a kmf switch (sorry I...
  9. Bear

    Select (Scottish) Certification Scheme Question on volt drop from 2391

    Hi all, I have worked out the volt drop on other questions using the formula mVxAxM. had no issues, but this question below has just fried whats left of my brain, I have the answer because i got it wrong, but how do you work this one out?? Being Dyslexic i do sometimes read the questions all...
  10. N

    Voltage drop calc

    can anyone tell me if this is a correct way of thinking i have 6 Cleaners outlets off a !6a rcd, total run length is 55m 6mm feed to first point is 30m would give me voltage drop of .78% (using half the breaker load according to exception 1 on page 163 of as 3000:2018) then run a 2.5mm for...
  11. Pretty Mouth

    Bonding conductors and their sheaths

    Hi all. I have a gas pipe to bond. The client isn't keen to have the cable run internally, so I plan to run it around the outside of the building. In conduit is one option, but will look at bit ugly IMO, so am considering clipping the 10mm direct. Anyway, it's thrown up a couple of basic...
  12. S

    Is this OK? 100m run of SWA

    Hi, So i’ve recently put a 100m length of SWA 2-core 2.5 to the other end of a field with a 16a commando socket at the bottom. It’s for a shepard hut to go down the bottom to be plugged in and out. The breaker it goes to inside the house where I’ve wired it in is a B16, onto the RCD that is...
  13. H

    What notification/certification is required for new Garage/Workshop

    My dad is knocking down his old out buildings, garage and small workshop, and having a new all in one built with a second storey to be utilised for storage area. The electrical supply and cable will be the same as was used for the original buildings which was fitted approx 20 years ago coming...
  14. T

    Cooker Connected to Ring

    I have an electrician undertaking the wiring changes required for the installation of a new kitchen. An issue has arisen because he insists on connecting my double oven (max load 5.9kW) to one of the rings - the house has two rings (each 32amp MCB). For the last 20 years a nearly identical...
  15. D

    EICR Certificate not issued. Not all circuits RCD protected rated C2

    Hello, I've recently had an EICR done on my 2 bed house which is a residential let. This house is about 25 years old built by Charles Church. The EICR has not been issued due do C2's, there were no C1's Email with C2s ratings for 1) Not all circuits RCD protected, 2) Bathroom light is a bare...
  16. S

    Can I avoid applying correction factor (Ci) when cable tray passes through a concrete wall?

    Hi This is about a design problem in an assignment. A cable basket containing several circuits passes horizontally through an internal concrete wall (100mm) and into a ceiling void where it provides lighting throughout the building. I'm trying to size the cables for the circuits and I'd...
  17. Dan Carroll

    Volt drop maths

    Morning team Question about volt drop. I presume I am missing something here. So firstly the facts out the OSG. Table 7.1, page 66, lighting circuit, 6 amp, RCBO protection, 1.5mm cable. The max allowed length is stated as 106m. Using table F6 for the cable info, for 1.5mm cable the mV/A/m is...
  18. SJD

    When did sockets require RCD protection?

    Can someone tell me when it became a requirement for sockets (domestic property, use by ordinary persons) to have RCD protection. Or rather, a flat completed (first sold) in Sep 2007, with no RCD protection for anything - would that have complied at the time. I don't have any earlier regs. that...
  19. U

    PME earth "disconnect gadget"

    I understand there is a gadget on the market to disconnect PME bonding. I/We are quite concerned about this and I would be grateful if a member could quote the Regulation number for this. Thanks in advance. Regards, UKPN
  20. M

    Capacitor Issues

    I have a Hayward pool pump where the start cap is 161-193 uf. How can you have a range of capacitance. Hayward is an american company. so maybe it can run on 110v or 240v. (just a guess). The other issue is ceiling fan caps, now these are start/run caps and I know from past experience that you...

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