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protective

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  1. C

    Separating earths at sockets

    Seem to recall being told but why do we separate earths at double sockets serving computer equipment.I seem to recall its to reduce static but what is the thinking behind it? Cheers
  2. G

    Confused about pv systems commissioning test sheets.

    Trying to get my head around pv system commissioning sheets ready for future mcs assessment. How do i work out my array parameters Voc (stc) and Isc (stc). How do i find out the dc rating (V) of the protective device and also can anyone explain how string test method annex -2 Voc, Isc,Sun is...
  3. S

    Socket outlets to BS 1363 with only one cpc terminal??!!

    Hi all, Ive just bought a box of 50 double skt outlets to BS1363, manafactured by GET England, but they have only one terminal for the CPC. The on-site guide (page 67) states "socket outlets must have two terminals for protective conductors. One terminal to be used for each protective...
  4. S

    Main Protective Bonding Of Plastic Installations

    As the original thread by sjm got hijacked i have reposted it: "Hi guys. Quick question and just looking for your opinions. If you had a main water supply pipe of plastic, for at least 20 mtrs underground, and a complete plastic pipe installation within the property would you require a small...
  5. E

    External sub mains which type of earth do you use as the CPC…

    When the origin is a TNCS and you are running to say a shed/barn which you are going to make TT. Which do you use to protect the sub main run the TNCS or the TT?. I’m thinking it’s the TT earth you use to protect the incoming cable. What do you guys use?
  6. I

    Help please. A2/A3 radial circuits

    Hi all. New member, first post. I'm only in training at the moment and i'm a bit stuck. My text books refer to A2 and A3 radial circuits, but for the life of me I cannot figure out what the difference between them is. Can anyone help or point me in the right direction? I would be very...
  7. G

    Very Handy Reference for Protective Devices

    Just stumbled across this. May be of interest to many people.............. Reference Guide to Protective Devices
  8. C

    Main Protective Bonding Question.

    Hi. I have a TN-S supply in my house BUT I cant seem to find the earthing for the gas and water which I thought should be connected directly to the main earthing terminal. The MET has an earth from the main supply then an earth going straight to the CU. But I was on the understanding that...
  9. marksparky

    no incoming services = no main protective bonding?

    hi folks been asked to wire 3 garages with provision for lights plugs car ramp roller door etc there is no water as yet but have been asked to leave supply in each unit for possible future toilet cubicle if whoever rents them wants to build 1 nor is there gas or structural steel so there is no...
  10. W

    Main protective bonding

    Hi,can anyone give me some advice,i have installed a sub consumer unit which is fed from main cu using 6mm t&e.i have realised that the earth bonding should be 4 mm and not the 2.5mm.from the main board(earth terminal block) is a main protective bonding to the water main (10mm) which passes...
  11. B

    Positioning of a protective device.

    Ok. we gotta install a fuse wher we have; A reduction in the size of cable Where the wiring system has changed There is a change of environment Where the cable type has altered. Example; A lighting circuit wired in 1•5mm T/E to a connector block, from there in 0•75mm to a...
  12. Z

    Supply Protective Device type

    Hi all, I am stuck with this one: How can you determine what BS type is the supplier main protective device? The one before the CU. I was doing a PIR in an old house and I am stuck with this one. Thank you!
  13. Amp David

    Charactaristics of Primary Supply Overcurrent Protective Device

    With a 2 way CU that is fed from a 32 amp MCB, when it comes to filling in an EIC, in the 'Charactaristics of Primary Supply Overcurrent Protective Device' part of the cert, is this the 32 amp MCB, or the main service fuse at the house end. Thanks in advance chaps.
  14. S

    Protective measures for fault protection

    :confused: Hi Gents What should I write down to this box on certificate? Thanks :confused:
  15. L

    very low pfc on submain board

    hi all hoprfully someone here can answer this question for me: i tested a sub mains today and i only got 0.35 KA is this normal for a submains as at the main mainsboard the pfc is 3.3 KA the main fuseboard has a rcd main switch so at the submain i had to use no trip pfc not sure is this makes...
  16. M

    bathroom fan RCD

    I was reading on another forum the other day and there was much confusion about if a SELV circuit fir a bathroom should be RCD protected. Some said it should, some said it does not need it because its 12 volt. I'm wondering if the difference is if the fan is located in the equipotential zone...
  17. J

    Using BS7671 to select protective device?

    Sorry for the vague title:rolleyes: Is there a table in the big red book listing the types & ratings of protective devices available? I usually just use table 7.1 in the OSG & I've had a trawl through chapter 5 & appendix 4 but can't find one:o
  18. M

    Vistalux protective eqpt.

    A friend of mine is having some recurrent problems with these two pole Vistalux RCCBs [i think] going pop for no reason i can discern. The first time it happened was when i pressed the test button a couple of weeks after fitting the new consumer unit and there was a pop and a flash and it never...
  19. A

    Query on Protective Multiple Earth

    Hi I have a question with regards to connecting two different earthing systems. I am on a vessel which has a switchboard set up that is TN-C, combined neutral earth, this is supplied by onboard gensets, 3 Phase 380V 50 Hz. With regulations as they are all boatyards/docks are set up with a...
  20. stef

    any conductor as protective earth

    Hi all, Just lately I have seen this quite a few times: a 4 core SWA (cores brown, black, grey and blue) feeds a single phase distribution board. The spare grey conductor has been taped up with green/yellow tape and used as an earth conductor. The steel armour has been bonded to the metal...

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