max

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  1. S

    Max Zs Coding Question 80/100%

    Hi new member here looking for a bit of advice. I recently undertook a condition report of a building where the measured Zs at the distribution boards (board Zs) were above 80% of the max Zs value of the MCCBs in the panel board supplying them. In some cases it’s also above the 100% value. I’m...
  2. O

    UK Max zs Values in the on-suite guide

    Hi all, Just wondering if anyone can shed some light on the max zs values in the OSG, they don’t seem to follow the 1.25 divisor stated in the note on page 126 For example BS 60898 circuit breaker, max zs at 70 degrees is 7.28, following the formula this should be 5.82 at 10 degrees which is...
  3. brixtonia

    Max immersion heater on 60A circuit?

    Hello, What would be the max Wattage immersion heater I could comfortably install on a dedicated 60A circuit? Not DIY but trying to figure out some options before speaking with contractors. Cheers!
  4. L

    Max Wattage on a Circuit with Newer Bulbs

    An electrician once told me that I should always be careful not to exceed too much wattage on each circuit in a house by replacing light bulbs with brighter ones that are of higher wattage (e.g. don't replace all 60W bulbs with 75W or 100W bulbs). However, with the newer CFL and LED replacement...
  5. 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.
  6. 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...
  7. 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
  8. 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...
  9. 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?
  10. J

    Max ZS

    Does anyone know how to find the max ZS for these types of breakers? Thanks in advance guys.
  11. 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...
  12. D

    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?
    • dokkan1080
    • Thread
    • conductor earthing main max resistance
    • Replies: 16
    • Forum: UK Electrical Forum
  13. 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...
  14. 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
    • Rodrigo12
    • Thread
    • circuits current earth install max protected rcbo rcd still
    • Replies: 23
    • Forum: UK Electrical Forum
  15. 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
  16. 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...
    • Elecpleb
    • Thread
    • amps circuit faceplate max temporary
    • Replies: 27
    • Forum: UK Electrical Forum
  17. 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%?
  18. 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?
  19. 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...
    • Manjunath
    • Thread
    • 230v adapter amp carrying connecting current max power when
    • Replies: 16
    • Forum: UK Electrical Forum
  20. 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...
    • Ampo
    • Thread
    • max resistance water water bond
    • Replies: 21
    • Forum: UK Electrical Forum

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