maximum

maximum

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  1. T

    UK Maximum Zs Value Exceeded

    Hi I have recently done some testing on an installation. A submain is fed from a B50 mcb and has a zs of 1.10ohms. The maximum for this is 0.87. The cable supplying the submain is a 25mm 2 core swa with the armourings used as the cpc and is roughly a 70m run. Both glands and earth leads have...
  2. S

    Hi I’m looking for the maximum permissible resistance reading of earthing rods

    Hi could anyone point me in the right direction for the maximum permissible resistance reading for earthing rods?
  3. Charlie_Don't_Surf

    Steel conduit maximum capacity for 90 degree thermosetting cables

    Hi, as part of a project for my level 3 C&G 2365 course, we need to provide power to a number of 230v single phase socket outlets on a ring final circuit for a workshop area within a building designed for light industrial work. The considerations about current carrying capacity and other...
  4. P

    What is Maximum circuit amps?

    Compressor plate LRA 82, RLA 16 Fan FLA 1.6 Maximum circuit amps 21.4 Max fuse 30
  5. B

    Maximum demand exceeding main fuse.

    I've got a customer who currently has a 60A main fuse running in 10mm tails to a board with breakers 32/32/20/6/6A which, doing the diversity calc at biggest breaker + 40% of the rest comes in at 57.6A, just about OK. She wants a new 32A cooker circuit, so I said she should get the tails...
  6. O

    How are you calculating maximum demand

    How are you calculating maximum demand for the certificate and what should you do if your calculations exceed the main fuse rating?
  7. C

    What maximum amperage for cables

    This question has probably been asked several time but things change. The house I'm living in now was built in the 1960's and has a ring main using 4mm Flat Twin and Earth. A lot of properties I've noticed have been wired with 2.5mm FTE and both connected through originally a 30amp fuse or more...
  8. E

    Electricity supply - Maximum Capacity of Connection 18 kVA

    Hello everyone! I have a question regarding the electricity supply and the maximum demand. One energy utility supplies an 18 kVA maximum capacity of electricity for a three-phase connection, and I'm wondering what this means in terms of the appliances and equipment I can safely use without...
  9. M

    Solar Maximum kW anyone has on single phase?

    I (well, the MCS installer) obtained approval under G59 back in 2015 for 11.5 kW of grid connection on a single phase. 12kW of panels into two 6kW inverters. I'm in a fairly remote area. Not aware of any other solar arrays feeding into my local pole mounted transformer. I'd now like to add...
  10. Lainan01

    Maximum Zs on circuit protected by RCD - 1667?

    Does a RCBO protecting a single circuit mean it can have a maximum Zs of 1667 Ohms since it's being used as fault protection?
  11. M

    Maximum permitted Zs question

    I am a lecturer teaching electrical installations and in reading through the on-site guide to prepare a lesson I have come across a section I have not seen before. On page 146 near the bottom, the OSG talks about applying an ambient temperature correction factor to the maximum Zs values given in...
  12. T

    What is maximum current of the mains?

    Hi, What is th emaximum current draw allowable from the mains for... UK domestic single phase Light industrial single phase Light industrial 3 phase If there are different levels, then please advise. Basically i suppose what i am asking is what current does the wiring have to be rated for...
  13. H

    Maximum demand and diversity

    Hey guys I really need urgent help understanding this Basically I'm trying to calculate what the diversity factor/percentages would be for the following circuits which are inside a hotel: 3x 32A socket outlet circuit 2x Vending machine circuit Fridge circuit Dishwasher Servery food holding...
  14. HappyHippyDad

    Maximum demand and EVCP's

    I'm always in a dilemma with regards max demand. Often you work it out and it's higher than the the 80A or 60A cut out fuse. However, you know that in reality it is absolutely fine. I have thought about this in the past when installing electric showers. Now with EVCP's as well it's making me...
  15. newfutile

    Maximum ZS exceeded on RCBO

    On a recent EICR i have ring final circuits (sockets) on type C 32 amp rcbo Some of my ZS reading exceed maximum ZS (0.55 OSG) ie:0.65 ohms . On a earth fault this will disconnect via the MCB part of the RCBO. How can i ensure a LINE to Neutral fault will still disconnect?
  16. Z

    Proving units maximum voltage

    I decided,having lived with using a live circuit, to buy a proving unit. I opted for a Kewtech Prove 4 which covers 5 voltages between 690volts and 50 volts. The device starts at 690 volts which is ok for my Megger 2 pole tester. My fluke clamp meter has a limit of 600 volts. The second problem...
  17. D

    UK Outbuilding Supply from house maximum demand

    A couple of questions for you. The electrician that rewired our house ran a 10mm2 SWA to our outbuilding. The total length of the cable is about 45m. It is in ducting underground at a depth of approximately 1.2m. Now, my understanding is that the max load for 10mm2 underground over 45m would...
  18. B

    Maximum number of panels.

    I'm an experienced sparky, now semi retired, with absolutely no knowledge of solar PV, which I'm trying to do something about. My questions are quite simple ones, but ones where Google didn't provide a definitive answer. A typical 2kVA grid tie invertor is a Sunnyboy 2000HF which has a start up...
  19. N

    Maximum zs on TT

    HELLO Im learner yet! i would like to know something about the TT system! if i would have an outbuilding installation, like sumer house!the main earthing sytem is tncs! so the bs 7671 recomend ONLY DO NOT export the earth from the house !what about if i still use the tncs earth to summerhouse...
  20. B

    Maximum Appliances on Ring ??

    Hi all is there a regulation stating how many white good appliances allowed on a 32a Ring. Had another discussion with a fellow electrician stating that maximum 4 x 2kw load white good appliances on one ring, but he could not quote the regulation think this is just his own preference. As he was...

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