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protective

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  1. S

    Main Protective Conductors - Continuity and Connection Verified - Sighting Clamp

    Are there any circumstances when it might be acceptable to tick the "Continuity and Connection Verified" box of the Electrical Installation Certificate when there is no visual or physical access to the point at which the bonding (normally a clamp in domestic) is applied. If so what checks over...
  2. SJD

    CU Change and Main Protective Bonding

    I've seen various conflicting comments about upgrading main protective bonding conductors, and wonder if there is a consensus on this. Typical scenario: Domestic CU change, PME supply, 16 or 25mm2 CSA tails, where the existing earthing and main protective bonding conductors do not meet current...
  3. B

    Bodging a touch current and protective conductor current test with a MFT

    Hello I have been asked to do a bunch of pat testing and I have a couple of questions that hopefully someone has an idea about. I have a Fluke MFT and a clamp meter and have built myself a socket lead which allows me to plug an appliance directly in to my tester. This allows me to do IR with...
  4. S

    protective device selection

    Hello all, A quick question... when selecting a protective device should you use the nominal voltage or the measured voltage? example 9.8k / Uo = 42.6A select 50A mcb 9.8 / measured voltage 245V = 40A select 40A mcb Thanks in advance
  5. S

    Electrical Installation Certificate - Supply Protective Device Characteristics

    What course of action is recommended when the type and size of supply protective device characteristics cannot be identified without pulling the fuse. I phoned the DNO and asked them for the info. Initially they told me to pull the fuse but later agreed that if I wanted that info they would...
  6. B

    IR testing ?

    Hello all just reading Professional Electrician and noticed this on IR testing. Just wondered if anyone else was aware of this,came in with 17th in 2008. It slipped by me.:dunce2: Live conductors and the protective conductor connected to the earthing arrangement. (Test 2) Regulation 612.3.1...
  7. i=p/u

    main protective bonding.... supplementry bonding

    was working today in house and plumber has pulled boiler and water tank out ripping all bonding off. the existing pipe work had supplementry bonding across pipes. question.. can i leave the supplementry bonding off too new pipework if have main protective bonding to my oil and water and...
  8. Tuttle

    Main Protective Bonding (Domestic CU Change, TN-S supply)

    I've gone around in circles several times on this and I'm still not completely sure what the answer is ... generally speaking, when changing a domestic CU in a house that has a TN-S supply and 6mm2 main bonding (which is in good condition) is it necessary to upgrade the main bonding to 10mm2? I...
  9. S

    16mm Earth main protective conductor

    Hi everyone, Just a quick question I hope I can get some advise on. Saw a 1 bedroom purpose built 1st floor flat last night that is in need of a rewire. The consumer unit is the old rewire-able type with 16mm T&E on supply side. Although its red and black on the 16mm, it does look newish (10...
  10. G

    Bi Callender Overcurrent Protective Device

    Anyone know if a Bi Callender Primary Supply Overcurrent Protective Device is BS 1361. All it says on the unit is Bi Callender (which i have looked up and is the manufacturer, and i cant find anything else on it). Don't know what to put on Electrical Installation Cert which is to be inspected...
  11. P

    suitable protective device for light circuts?

    hi peeps, just looking for some much needed and appreciated help on an army barracks with roughly 7 to 8 buildings to the installation. what would be suitable protective devices for the lighting circuts thanks
  12. P

    Protective Conductors Continuity

    Hi Guys and Dolls In my 2004 edition of the IEE Inspection and Testing Guidance Note 3, page 78, Protective conductor continuity can be confirmed with an Earth fault loop impedence test (R1 + R2 or R2 is not required to be measured). (Note 4) Ring circuit continuity also does not have to be...
  13. J

    Protective earth bonding run externally, no mechanical protection

    A few years back I carried out a pre work survey and discovered a contractor had installed the main protective earth bonds clipped direct externally. When I questionned him, he assured me he was using a UV tolerant and weather-friendly cable that therefore complied. It was a brown cable which...
  14. S

    Form filling primary over current protective device

    On the main over current protective device I'm looking at it states 100 amp 1.3/16 DIA does anyone no what type and Bsen num it is as I can't see it in the regs. Thanks Chris
  15. C

    Main Protective Bonding, 1 or 2 conductors?

    I had a search with no joy. I am trying to find a reg to state if its ok or not to use 1 continues 10mm conductor for gas and water Main Protective Bonding . Having a look at a new CU install where there is no MPB and lighting CPC at all . Fun Fun Fun :clap:Thanks
  16. 1

    How old is this overcurrent protective device please?

    Never seen one of these before but I'm sure plenty of you guys have. Please could someone be kind enough to tell me more about it:thumbsup Would this be part of the distributors equipment or the consumers? Many Thanks in advance
  17. P

    old water main protective bond -

    Was a water MPB ever allowed to be incorporated onto a cpc? I found a 10mm water bond connected to a nearby 10mm cpc single that was serving a dedicated cooker circuit in a small purpose built flat from 1960s approx. Oven is only 2kW. Was just wondering if it was ever a recognised way of doing...
  18. G

    Prospective Fault Current

    Two questions here really Am i right in thinking that PFC is Prospective Fault Current or is it power factor corection? Second question is why is it important to know the Prospective Fault Current? Thanks
  19. W

    PV Protective Device

    Hello. ok so stupid question time, on the PV test certs that we have to fill out it mentions protective devices I have just left this part blank.... I know what a protective device is on the AC side (RCD for example) but I am drawing a blank with the DC side. so please tell me am I being a...
  20. D

    Protective conductor size... 2 contradicting regs?

    Been reading up on the regs regarding protective conductors and doing a few calculations for imaginary circuits. What is the point in having Table 54.7 in 543.1.4 if the values contradict those calculated using the adiabatic equation are much lower? Is 54.7 just there as a time saver so you...

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