maximum

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  1. 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?
  2. 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...
  3. 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...
  4. 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...
  5. 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?
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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?
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. J

    Maximum LED load on a Lutron Maestro Pro Dimmer

    I have Maestro Pro dimmers throughout my home. I have remodeled the kitchen and want to upgrade the lighting. I desire to put 15 10-watt led can lights on one Maestro Pro led dimmer. The Lutron representatives say "no problem" but I would like to make sure that is the case before I run all...
  17. Zdb

    Maximum kW fixed load on RFC

    So if 2kW is the maximum fixed load for a 2.5mm RFC. What would you say the maximum fixed load on a 4mm RFC should be? If different.
  18. P

    Maximum spacing supports for metal trunking HELP

    Evening people, Was hoping someone could help me with this problem I'm having. I am writing up my portfolio NVQ and writing about installing metal trunking. On the OSG page 143 table D4, column number 1 list the trunking sizes by cross sectional area. The trunking I have used was 100mm x...
  19. Mark Wright

    Maximum Branches from Socket on Radial that's acceptable.

    What would be the maximum amount of Branches from a Socket on a Radial that you would find acceptable? I've seen 4 I'm not talking about Design or being Tidy or keeping it nice for testing but how many would you say No that's just too many?
  20. newfutile

    Maximum ZS values GN3

    On page 142 of the latest Guidance Note 3 it list a 16 amp type B max ZS as 2.15, however i think 2.2 is the real value, it also states that at 16 amp type C is 1.1 ohms which is correct, but a type B should be double the value of a type C. anyone else have a view on this?

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