factors

factors

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  1. ziddyGus

    Trunking Factors

    Hi, I am currently doing a level 2 (2365). We have been doing trunking factors and I am not sure about if you need to apply the 45% space regulation to the factor. For example, if I have trunking of 50 mm x 50 mm the trunking factor is 767. I have 1.5 mm solid thermosetting cables that have a...
  2. B

    Grouping factors

    2 x 2.5mm twin and earth (ring circuit) in 25mm pvc conduit buried (plaster/concrete). Domestic. Who here would calculate grouping factor to further derate the cables?
  3. B

    Grouping factors domestic

    Hi all question regarding grouping factors in a domestic house. is there still a need to apply grouping factor Calcs in a 3 bed domestic house hold, I mean do we apply grouping factors for going through joist holes,where there is say 9 cables going through a 32mm hole but length of grouping at...
  4. B

    Cable calculation - Derating factors

    This is my first time here so please go easy ? I am currently designing some circuits for large convenience store and I have a question about the thermal insulation derating factor. A radial circuit will feed two display fridges, total load 10A. The circuit will run from the DB through the roof...
  5. J

    Diversity Factors

    Hello people, I'm designing switchgear for a residential estate, of about 60 houses, specifically the protection for the incomer. Is there any provision in the British Standard that advises on diversity for such a large number of household units?
  6. R

    Long method de rating factors

    Having used Amtech for so long I can't remember if the de rating factors are applied to the design current or the tabulated regs current, can anyone give me a refresher example calc, I guess it has to be tabulated if it's a current reducing factor
  7. F

    Lighting correction factors.

    Now I know with discharge lighting you times by 1.8 but I was wondering what factor to use for high frequency (HF) ballasts and also LED lighting? Was thinking maybe 1.2 just to be safe?
  8. B

    Cable Factors for trunking

    Hi All, Anyone know the cable factor for 150mm LSF cables for installing in trunking? Table E5 in my OSG only goes up to 25mm!
  9. T

    Customer service from City Electrical Factors

    Just had a phone call. HELLO! I wait ARE YOU THERE! Who is this? say I I CANT TELL YOU WHO I AM I HAVE A SECRET CRUSH ON YOU Put the phone down Check the internet for who the number is, it is CEF. Call them and someone answers and like me finds it very weird. They say they will ask technical...
  10. Pete999

    Pete's Videos Spacing factors???

    http://www.electriciansforums.co.uk/forums/electrical-forum.15/create-thread
  11. D

    Derating Factors

    Hi guys, Might be a silly question but getting really confused. Table 4D5 for choosing cable size for different installation methods, does this already have de-rating factors applied for the different methods? If so, then if you calculated your current capacity using specific de-rating factors...
  12. D

    Circuit Breakers

    Was just looking at circuit breaker types and I was a little bit confused so wondered if anyone could help clear it up. Basically say If I determined my current would be 26a before taking into account any rating factors and chosen a 32a circuit breaker for my protective device. After taking...
  13. Dan

    City Electrical Factors Ltd

    City Electrical Factors Ltd is a private limited company established in 1951. We are the United Kingdom’s leading Electrical Wholesale Network with almost twice as many distribution outlets as our nearest competitor. Our group of electrical companies not only extends throughout the United...
  14. rolyberkin

    City Electrical factors - On The Up!

    Well I never thought I would say it but I went into CEF Chelmsford today and was pleasantly surprised, credit where credit is due. I normally only go in there when I absolutely cannot get stuff elsewhere. Chelmsford has a new female member of staff who is obviously learning the ropes, she...
  15. 2

    Conduit runs over 10 meters

    Hi, as my name says im just trying to do the project on my 2396, im looking into my options of cable management and on route i have stumbled across conduit rating factors p142 yellow osg (ive never worked with conduit) and the rating factors only go up to 10m, is this 10m maximum length or 10m...
  16. R

    Derating factors

    hi i was doing a 17th edition practice exam and got a question about a cable running through a cavity with thermal insulation of 50mm, it asked for the derating factor for it. i cannot find derating factors in the index of the regs book, could anyone point me in the right direction to find the...
  17. Dan

    City Electrical Factors sponsor ElectriciansForums.co.uk!

    Dear Forum Members, YOU SAID - WE DID! We asked which Electrical Suppliers you use most; http://www.electriciansforums.co.uk/electrical-forum-general-electrical-forum/89888-most-used-electrical-suppliers-electrical-wholesalers.html and the outcome showed us that CEF came out one of the top...
  18. happysteve

    Current carrying capacity of a ring final circuit - grouping factor?

    Eh up :) I'm trying to challenge myself with scenarios where I'm not sure if my interpretation of the calculation rules + regs is correct or not. RFCs are doing my head in. I think I understand most of the theory: - 433.1.204 lists a specific case where a RFC protected by a 30/32A protective...
  19. C

    Galvanised Conduit in house conduit factors

    Hello. i've got a brick wall in my conservatory and ive painted it a color but left the bricks on show, currently the electrics for s/o and lighting are in shoddy plastic off cuts of mini trunking and exposed bits of old twin and earth. I was thinking of using Galvanised conduit and put it on...
  20. uksparks

    Grouping Factors

    Hi, I have just finished off a kitchen and swapped the CU out at the same time... Part of the run of the cable goes under the kitchen floor in a duct... Its 2m long the duct. When applying rating factors, is there a min and max length in comparison to the overall length of the run? I have...

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