max

  1. Weezy

    UK Exceeding the max Ze in this situation still be considered to comply?

    If the max Ze for Tncs is 0.35 but you had a 1361 60amp fused isolator before the c.u with the 1361 having a max Zs of 0.56 (from the 80% chart) if the recorded reading at the c.u was let’s say 0.47 ohms would that now be considered to comply? i can’t see why it wouldn’t.
  2. J

    BS88 max ZS table for fuses over 63A TT or not TT

    Hi First time with this kind of a job for me. I have a scenario where i am planning to install about 50m 25mm TPN from a TNCS supply to supply a small metal container housing TPN pump control gear to control two TP 24KW .8 PF pumps (to be fair one is a 15kw, but allowance to swap out one for a...
  3. L

    DISTANCE from D/G socket to max reach of pull out kitchen tap ?

    Distance from D/G socket to extended pull out kitchen tap ? Kitchen tap when pulled out is easily with 400 mm of a D/G socket . Not my job . Just asking for clarification etc
  4. V

    Max Zs multiple boards

    Had a bit of a brain freeze. Got to go and do an inspection on a property with 2 consumer units, the 2nd fed from the first on a 50A MCB. Let's say theoretically I get 0.2 for the Ze on the main board, then 0.3 for the Zdb at the second board and 0.2 for R1+R2 on a ring final on a 32A MCB. Is...
  5. N

    MCB max load for an oven (EICR)

    I want to check the rules when doing an EICR for MCB size for ovens. My mate says i should fail an installation because there is a 40 amp MCB on an oven rather than a 32 amp. Is he right?
  6. J

    Max ZS

    Does anyone know how to find the max ZS for these types of breakers? Thanks in advance guys.
  7. timhoward

    Max demand fun

    This isn't sitting right with me. So if I rock up at a house with a 60A suppliers fuse, it has a dear old Wylex with 1 RFC 30A (no diversity) 1 Cooker 30A (no data to hand, plate has socket, assuming 21.6A for now) 1 Shower 30A (7.5Kw - full rating) 2 Lighting 5A ( 21 points total * 100w * 0.6...
  8. dokkan1080

    Main Earthing conductor max resistance?

    I know main bonding to water and gas need to be 0.05 ohms But what about the main earthing conductor? Does it have a maximum resistance value from MET to the CU?
  9. dlt27

    Fluke 43b help and logging max demand

    Hi all, I have brought a fluke 43b to log a local farm to see how many amps they are using at maximum demand. The meter gives 3 readings for each time interval. Min, max and average. I would understand if the readings were between 2 time periods, but don’t understand how you can have three...
  10. R

    If all circuits are rcd or rcbo protected max current 150mA why do you still have to install 16mm earth

    THIS IS FOR ELECTRICAL NEWS ONLY
  11. P

    UK what size fuse should I use in a DC syatem?

    Hello if I have an appliance with a max current draw of 5.55A and an short circuit current of 6.11amps what size fuse should I use in a DC syatem?
    • pt12345
    • Thread
    • appliance circuit current fuse hello max short short circuit size
    • Replies: 3
    • Forum: UK Electrical Forum
  12. E

    Temporary circuit - max amps to faceplate?

    I have set up a sub main supply to my shed as follows: 32A MCB on main fuse board 6mm T&E Sub-mains board (B&G with RCD (40A 30mA)) 32A MCB 4mm T&E @ 3m Terminating at X2 double sockets I have been told the sockets could melt as they will only be rated for 13A plugs, not a 32A radial in 4mm...
  13. P

    AM2 Max Zs

    ago Hi, I have my AM2 next week and I'm unsure if i should be using the Max Zs figures from BS7671 at 100% or the On Site Guide figures at 80%?
  14. Michael J

    CU recommend max height

    Doing a complete rewire on a domestic property. The client is adamant that he wants the consumer unit flush to the ceiling not complying with the 1350-1450mm requirement. I have shown him Approved Document M but he’s having none of it. What would you do in this situation?
  15. M

    5v 2.5 amp adapter (IN 230v ac 0.2 amp max) damaging when connecting to a high power line which is carrying 50 amp current

    Hi, I have a product in which 5v 2.5 amp adapter (input 230vac 0.2 amp max) used. The adapter is burning out sometimes usually when I connect it to the one of the phase (in 3 phase line where ac >30 hp motor is connected) carrying upto 50 amp current. Now my question is why the adapters are...
  16. A

    Max water bond resistance

    Hi all so I have a situation where a client is moving and they want the db changed for selling. Db change is easy enough as is running a bond to gas which is currently missing. The only issue is that the last eicr said that the water wasn't bonded. It would involve major works (tiled floors and...
  17. mak

    Is there a max Zs for lighting circuits?

    I can't find anything related to this in the regs so I probably misunderstood the question. The way I see it the max Zs for any lighting circuit depends on the circuit breaker for that circuit. Say we have a lighting circuit with 100x36W ceiling lights which gives us a load of 16A, we choose the...
    • mak
    • Thread
    • circuit circuits confused earth fault impedance lighting loop loop impedance max radial types
    • Replies: 7
    • Forum: UK Electrical Forum
  18. KennyKen

    What’s your countries Max Zs Values?

    I’m intrigued to see the differences in Max Zs values compared with the 18th & NEC
  19. R

    Max demand for double oven and hob

    Just some clarification please. Max demand for cooking devices. OSG says 10A + 30% of "connected cooking appliances in excess of 10A + 5A" if a socket is available in the isolator. The oven and hob are two devices. Does the 15A apply to both of them or just the first one? eg: Oven 4.8 kW Hob...
  20. A

    Confusion about max wattage for light fitting?

    Hello I hope you are well, I have a question regarding this light fitting (BELL 10361 Retro Vintage Half Lantern - Black, PIR, IP54) on the product data sheets it states the max lamp that can be fitted is 42W is that 42W total or equivalent it doesn't state? So would a 18W LED GLS be unsuitable...
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