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maximum

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  1. G

    Breaking capacity of 3871 fuse lower than pfc?

    i have just done a test on a property and the pfc at origin of installation was 0.712ka. The 3871 mobs have a 6000a breaking capacity. I am a bit confused as I have read something about it always being higher anyway (16ka) for a fuse or main switch 100a or less. Any info here would be much...
  2. S

    Kitchen ceiling light - maximum lumens?

    My 88 year old mum needs new lighting in her very small open plan kitchen. They've just built a house next to hers and the daylight is much diminished in her kitchen and adjoining dining table area. Can anyone recommend a good bright diffuse light for her kitchen ceiling? Would this light be a...
  3. JamWatts

    Watts whats - maximum wattage ratings for incandescent - what about LED's

    Hello all, This question has always puzzled me - hopefully you will be able to help? I'm looking at replacing my main lounge light, as it's current light low voltage transformer has failed - so I want to replace it with a mains voltage light, to prevent any more transformer issues in the...
  4. J

    calculating total consumption for each of the circuits and final maximum demand curre

    I have to calculate the total consumption for each of the circuits and state the final maximum demand current. downstairs :2 fittings with 5x 12w lamps,1 fitting with 5 x 12w 1 fitting with 10 x 12w,1 fitting with 1 x 60w,1 fitting with 7 x 20w 2 fitting with 3 x 20w,1 fitting with 4 x 30w and...
  5. L

    Zs of circuit higher than maximum values allowed?

    Hi there, I have a ring circuit where the Zs reading taken is higher than maximum allowed values. the circuit is protected by a 32a RCBO type C device, Zs = 1.43. I have currently have tightened terminations which has brought it to its current value. as i have been out of the game for a while...
  6. T

    maximum devices for 32A ring

    Hi all We are setting up a IT training company and we are trying to work out how many devices he can have in training room. There are 5 double sockets in the room, and they all go back to a 32A fuse. We want to have the following in the room, will this be ok with the fuses/amps etc. 45W...
  7. J

    TT system with No RCD

    Been out to replace an oven on an installation which pre dates the need for RCD's so only has MCB's, the earthing arrangement is TT. As I am only changing the oven this need not be RCD protected but is the maximum Ze still 200ohms?
  8. G

    Underfloor heating Controller

    The underfloor heating controller says it will be able to pull a maximum of 16 Amps. The supply is from a 20 RCBO. 2.5mm Twin and earth to a 13 Amp switched fused spur. The load side of the spur feeds the underfloor heating controller. The owner is saying that if for what ever reason the...
  9. S

    What's the largest size array for a 60 amp cable head fuse? Single phase.

    SP Networks are the DNO. Smallholding with single phase and 60 amp cable head fuse. What's the largest size likely to get approval?
  10. B

    Maximum zs calculation

    Hi All, Wondering if any of you could help... I am currently pricing up a Nursing home extension and the easiest method to get a supply including the cheapest is for me to run a 16mm 3 core SWA from the existing care home to the extension which is approx 85 metres. The supply will be fed from...
  11. E

    Maximum Zs for distribution circuits protected by 60947-2 MCCB's

    Anyone know where I can view up to date reference documents etc to acquire the Maximum Zs for distribution circuits protected by 60947-2 MCCB's? Regards David
  12. M

    Maximum diversity and Garage DB

    Hi We are doing some refurbish work at my house and I am planning to run a new feed to the garage and install a DB. Mainly because I don’t trust the exciting wiring in there and I have no idea where its supplies from. Plus I would like a separate DB as I use a lot of tools in the garage and I...
  13. B

    Eicr

    Hello friends, i have been doing EICR for caravan sometimes now. On 16A or 32A hookup box with 30maRCD protection mostly found 1ohms or more Zs at hookup and more inside the van. When you put the results in schedule of test sheet which will not comply with maximum Zs value table from regs book...
  14. Leesparkykent

    Maximum zs

    Stroma Gives Away Zs Data Sheets - Professional Electrician http://professional-electrician.com/win/stroma-gives-away-zs-data-sheets/ 6 Mar 2015 - Amendment 3 to the 17th Edition Wiring Regulations, released on 1st January 2015, ... The new maximum values of Zs for TN systems; The new 80% values...
  15. K

    Maximum demand a diveristy

    Hi i have a problem don't know how to calcuate maxmium demand with diveristy and without The circuit are: UP lighting 6A Down lighting 6A Up radial contain 3 double 16amps down RFC 32amps Shower 7kw 30.43A Cooker 28amps Could someone help me with that
  16. T

    Maximum demand

    Help!!! I've been asked to work out the maximum demand for a new property for the DNO, I believe I have worked it out correctly applying diversity (something I've hardly looked at since college) but it seems abit high. there will be 12 potential circuits. 1. 32amp cooker 2. 32 amp hob 3. 32 amp...
  17. R

    three phase supply Maximum demand and Diversity Quick questiion

    Hello All, Just wondered if you have time to answer a quick question. For maximum demand on a three phase final circuit i.e A 20 A TP-N supply. Do I have to allow 20 Amps for each phase without further calculation.
  18. Y

    Maximum demand calculation

    Hi. Question regarding maximum demand calculation. I have a customer which wants to have a second kitchen fitted in the house. Is this at all possible? There are two consumer units in the house. One which has following circuits: oven 40A hob 32A ring basement 32A ring gtound floor 32A ring 1st...
  19. A

    Anticipating maximum demand

    Hi guys, I am after bit of advice regarding calculating the anticipated maximum demand. I dont know a lot of details about the install apart from: It is a 3 phase pme, 100A cut out. Light industrial use. I am calculating small power and lighting only, no mechanical. Lighting will be LED. The...
  20. G

    Maximum ID for 2mm2 wire crimp

    Maximum ID for 2mm2 wire crimp Does anyone know what the maximum Id would be. We are using CE5 connectors, but different suppliers suggest completely different wire sizes as suitable.

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