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  1. T

    SWA cable rating - 2 core or 3 core?

    Hi guys and girls, When calculating current carrying capacity of SWA; if you have 3 core swa but one core is being used as the cpc, is the SWA classed as 2 core? Many Thanks
  2. lurch

    Rating factor within an enclosure?

    I seem to recall there is a rating factor that can be used within an enclosure effectively uprating the current capacity of the cable. Does any one know what this is and can it be found in BS7671 or is this a rule of thumb (?) for switchboard manufacturers?
  3. S

    Mobile equipment not exceeding a rating of 32a for use outdoors.

    Could someone please give me examples of what this would cover. I'm assuming it's irrelevant to portable equipment like a lawn mower on a domestic installation and more to do with industrial. Thanks in advance.
  4. S

    Minimum IP rating for wall mounted external industrial socket?

    What is the Minimum IP rating for wall mounted external industrial socket? It's to be outside & only used for plugging in a generator that will give house temporary power through a changeover switch in the case of power cuts.
  5. L

    Cable size issue with size of shower

    Hello Looking for some guidance please. Lived in current house just over a year now and had couple issues with our pull cord switch (45A) sticking. Also at its worst, experienced the neutral burnt out. My relative (industrial electrician) has put some potential issues across to me so was...
  6. L

    LED Floodlight nameplate (Power Rating)

    Hi Everyone can someone please clarify the following: A floodlight nameplate has the following information: LED100/WW 110W (2x50W/LED Module) What does the 100 means and if it is 110W - Why it state 2 x50W Thanks
  7. M

    Garage expansion / MCB rating

    I've just moved into a virtually new home with detached double garage and has the original install as supplied. I need to add a lot of light internally in the garage…..something like 12x58w tubes. I also would like to add 2-4x double sockets around the space. The current setup has 2.5mm T&E...
  8. 1

    increasing multimeter fuse rating

    i was wondering why this is a bad idea or if it's a good idea(pretty sure it's not) Last week I repaired a vehicle with failed glow plugs, to test the plugs I just did a resistance test, I currently don't own a stand alone amp meter, I have an amp clamp but the wiring wasn't very accessible...
  9. M

    LED lights from dimmer flickering. Load is below dimmers minimum rating.

    Hello. So I've learned a lot about dimmers on this last job. The customer wanted everything downstairs on dimmers and boy has it been a learning curve. I've split a lighting circuit and the customer has asked for 2 x st64 led bulbs on pendants to be put on a dimmer. The problem is they're...
  10. W

    3amp

    Will a 3amp fuse for a cooker hood extractor fan and lights wired in 1.5mm off a spur be okay. There was no wattage for the fan and there was two lights. Surely that can't draw more then 700 or so watts. My boss complained why I did that,just checking he's not winding me up
  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. N

    Supply cable - rating

    Ive always wondered how they calculate supply cables size. Can anyone tell me why every time i go to a house and theres a lot of demand on the board and then you look down and see what can only be described as a "pecker" of an armoured cable running into the cut out? How can this be justified...
  13. R

    Diamensions of Proteus Isolator please.

    Hi, I'm trying to buy a Proteus isolator the same diamensions as the two that we already have. The current two are mounted and cannot be turned off to be opened without severe disruption to find out the rating. So, I would be grateful if someone could measure the diamensions of one you may...
  14. D

    Quick question about 12v parking buzzers

    Hi, just joined to get the definitive answer to this conundrum. The parking speaker in my car is really quiet, so I bought a 12v DC buzzer from Maplin to replace it. The Maplin buzzer doesn't work when connected to the car, but works if powered direct fom the battery. The voltage at the...
  15. R

    What size contractor

    Well lads iv been asked recently to do a job that the customer wants all the sockets in the garage isolated as he leaves in the evening preferably using an isolator switch. There are 4 socket circuits.Can anyone recommend what size (and brand) contactor and isolator switch cheers
  16. D

    Terminal terminology!

    I am trying to replace some thermostats on a ceiling heating system, I think they are Honeywell T6060 units. The terminals are designated as 20(4)A @ 240v. I assume this means they are good for 20A load, BUT what does the (4) mean?? Any suggestions for modern replacement units that can carry...
  17. S

    HOFR Cable

    I am looking to use HOFR cable on a job coming up - supply to a 12 KW single phase water heater unit. The unit has a maximum cable capacity on the terminals of 10mm. I have looked and feel HO7BN4-F (638TQ) is the best for the job - but was hoping someone could confirm the correct current rating...
  18. Pat H

    Cable size less than protective device rating

    Noted today an interesting comment on page 43 of christopher kitchers Practical guide to inspection, testing and certification of Electrical Installations ( a great book ) Under Shower curcuits he states: For this type of circuit it is possible to have a cable which has a current rating of less...
  19. C

    Transformer rating; apparent power?

    Hi I've got a uni assigment which includes build an equivalent circuit. The transformer is rated at 2.2kVA which I thought was the apparent power. But if I calculate the apparent power by using Vp x Ip then I get 220VA. To find the phase angle Im confused do I use the 2.2kVA or 220VA for the...
  20. P

    SCC rating ...

    Hi All In the process of entering data for a recent EICR and could do with a little help to fill in a blank field ... Short Circuit Current Rating for ... a Wylex 100A 100mA DP RCD BS4293 not time delayed. I did look when on site, but couldn't spot it on the device, front or sides and don't...

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