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  1. D

    UK Substation LV Feeder Pillar Fuse Rating

    On a commercial 200A TP&N supply, what rating would the substation feeder pillar fuses be? Would they typically also be 200A or a higher rating? Source URL: Electrical Forum - https://www.electriciansforums.net/forums/electrical-forum.15/
  2. T

    IP rating ???

    Hi lads, question regarding the IPrating of equipment. Going on BS7671 18th edition. If I require a piece of equipment rated IP66 which is dust tight and protected against power water jets,does IP67 meet these requirements ? I have heard from other electricians that IP67,does not meet IP66...
  3. O

    Double oven and hobs rating

    Hi All, I'm a retired spark and separate double ovens and hobs (induction) weren't around in my day. I did mostly power station work after a few years domestic. My daughter asked me to wire in her double oven and hob, however the rating on the double oven says, Oven A .77kW per cycle and similar...
  4. J

    UK Switch

    I have a switch that is with a rating voltage of AC 250V/ 1A – can I use this to turn a standard desk light that is plugged in to the mains??
  5. Baddegg

    Ka rating

    Anyone point me the right direction for the ka rating of bs 88 class Q...
  6. S

    Which fuse rating to between starter and leisure battery?

    What fuse rating do I need to put in between the starter and leisure battery? I have a 12V 75AH Starter battery and 110Ah leisure battery. Cable size 16mm or 8mm. (this is for my off the grid van :) )
  7. A

    IP rating of Nylon cable gland

    Hi guys New to this forum and thought I’d ask the powers to be on here for some advice. Basically I’m on a job installing some electrical instruments. The instruments are quite small and have come with the gland body , lock nut and ip washer on the outside . The reason for this is to reduce...
  8. B

    Rating of CU main switch

    Hi all, I noticed on my consumer unit that the main switch is rated for 100Amps, however the total load of all the MCBs is over 150Amps! I appreciate that diversity COULD (?) be applied in that not every circuit would be simultaneously running at full capacity, but is the installation...
  9. Gary Tollison

    Kitchen ceiling lights fire rating

    greetings :) Was curious about the ceiling lights in the kitchen if they were fire rated or not. Google was no help with model info. There’s an F in a triangle symbol on the side, but I don’t know if that means anything. Any ideas? Thanks, Gary
  10. darkwood

    Tagging a post for a rating.

    As most of the tags/ratings you can add to the post are positive we don't need to reflect on them but with regards to the negative ones, specifically the 'Dumb' and 'Disagree' options, can we ask you add a follow up post to express your opinion and why you are in an opposing stance. What we...
  11. C

    Switch gear / Panel board Rating

    The Incoming breaker model is Terasaki - S250-PE, 250 Ampere Frame rated for which Ics is 70kA, Category A breaker The outgoing breakers model is Terasaki - H125 NJ, 125 Ampere Frame rated for which Ics is 85kA,Category A breakers The bus bar rating is 65kA for 1s. How should this panel board...
  12. happyhippydad

    What power rating would this garage door be?

    I have a roller garage door that my friend has fitted which i've noticed is connected to a socket to give it power, but then has a flood light attached to the control panel which is also connected to the lighting circuit. In other words you need to isolate sockets and lights to make sure the...
  13. spud1


    Hi chaps A Wholesaler told me me this week that the RCDs in the new '18th' split load boards have to be rated at 100a because the 100a service fuse is only means of upstream overcurrent protection. But I was once told that service fuses, although marked as 100A on the cutout label are actually...
  14. S

    Christmas lights transformer rating

    Hi I’ve got a set of filament lamp Christmas lights, which I think is quite old. It is a set of 80 lights, and the lamps are rated at 2.4V, 0.29W, 120mA. The transformer is rated 24V(AC), 0.7A, 16.8VA. It had 8 ballast lamps installed, so I assume 1 ballast lamp for a string of 9 normal...
  15. C

    Bus Bar Ampere Rating of MCCs, Sub distribution Panels

    Is it mandatory to have the bus bar rating equal to the Ampere Frame (AF) of the Incoming Breaker (MCCB) in the MCC, sub distribution panels. Is it okay to have the bus bar rating equal to the AT ratings?
  16. B

    MCB rating advice is appreciated.

    Just a quick question got a new boiler going in soon and noticed that the MCB that will be used for the dedicated feed ( on kitchen ring ATM ) is 16amp is this correct rated MCB? or does this need replacing with a 6amp MCB with a 3amp fuse at spurr? Cheers
  17. B

    Industrial what is electricity rating for

    Hello I have seen electricity meter that show rating of 5-30Amp why it is not less than <5Amp
  18. Joshua

    Earwig, a new upcoming agency rating website.

    I hope this is in the right forum I thought I would share this, it's a website that's due to be released by the end of the year. It's a Service for agency workers to review agencies and rate how good they are. Hopefully it'll benefit someone in the forums. You can sign up here earwig -...
  19. 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
  20. D

    UPS - input rating vs output load

    with a single UPS rated at 8KVA, 230v, stating maximum input current of 44A, would the over current device, cable size etc be based on the 8KVA installed load (the UPS), or, the actual load of 8A, connected to the output of the UPS ? this is a fixed installation, supplying computer based loads...
  21. L

    Induction hob plus oven wiring - rating?

    Hi guys, I need to have an induction hob and oven connected up. Units are: Hob: AEG HK654400XB Induction hob - HK654400XB | AEG - https://www.aeg.co.uk/kitchen/cooking/hobs/induction-hob/hk654400xb2/ Oven: Miele H2561BP Miele Ovens | H 2561 BP Oven -...
  22. haptism

    Does BS7671 allow fuse rating to exceed cable rating

    Does BS7671 allow fuse rating to exceed cable rating where it is not required to offer overload protection ?? As in the case of a 100A fuse/16mm tails: supplying a CU with just a few final rcbo circuits ?
  23. 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
  24. 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?
  25. 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.
  26. 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.
  27. 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...
  28. 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
  29. W


    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
  30. 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...
  31. 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...
  32. 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...
  33. 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
  34. 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...
  35. 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...
  36. 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...
  37. R

    Electrician Electrican Help Needed on Van Conversion (Broad Town, Swindon)

    Hi there, Basically, I'm converting a panel van. I'm planning to install two sets of LEDs & two mains sockets via a leisure battery/inverter/battery charger combo. I've been swatting up (thanks to much help from people on this forum!) and am almost ready to finish off the job. I'd love for...
  38. S

    Operating Voltages?

    Hi there My enquiry is to do with lamp flex and voltage parameters. I want to buy flex from China, vintage look, multi coloured casing etc, and it states.. 1..Certified SAA, VDE, UL 2..operating voltage 100-300v If I am going to sell table lamp products in the UK, where I live, will I need...
  39. L

    PVC conduit ends on Metal CU??

    Hi All Is this allowed under amendment 3? Yes its a conduit female end into the side of the CU with T&E coming out into the trunking. No it is NOT my work!
  40. D

    PFC on EICR

    Came across a PFC result on an EICR today of 10KA. My meter is calibrated and I carry out monthly checks with a check box to ensure the on-going accuracy of the equipment and all tested fine up to today. Im not sure if I should quote my customer for C type R.C.B.Os with a higher breaking...
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