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  1. H

    Fused spur rating for electric underfloor heating

    Builder installed 175w / sq metre in an area 6.7 x 3.5. What should the fused spur be rated at and should it have a contractor as well? Am I correct in thinking it is drawing just over 17A therefore 13A fused spur is insufficient? Thanks
  2. M

    Maintaining top entry fire rating/IP rating

    Evening all Had a job yesterday, which I'm back at next week. Job was to install new dual tarriff CU. As can see from photo earthing was supplied off a clamp from incoming metallic pipe which contained the supply cables. As this old CU is double packed out with a frame it had ample space to...
  3. K

    Need Transformaer secondary voltage and amps rating

    I need a help from members. My transformer from JBL Sub Active woofer has failed.It 230 V primary and secondary no voltage details mentioned.It has five wires and center is ground. In Service manual indicates ,First set two wires after bridge rectifier /Filter shows +15vdc,-15vdc (capacitor 35v...
  4. S

    Motor rating plate help 3phase

    Evening all, got this rating plate on a portable feed augar motor, it's currently wired in some seriously past it SY cable, the farmer wants to renew it , I've suggested H07RNF as best choice, but I'm not clued up on reading motor plates to size it, I see 29 on the plate, and assume it to be...
  5. A

    UK Impact on cable rating if trunking used to consumer unit

    Hi My consumer unit is located in the garage, the cables are currently clipped to a solid wall above the unit. I am considering putting the cables in trunking to give them some more protection, the trunking would be just under a meter long. I believe its common practice to use trunking in this...
  6. S

    Fluorescent lamp rating confusion

    Hi, I was replacing a G24D-3 fluorescent lamp in an outdoor light, and a label on the light fitting stated the lamp type was a 26W G24D-3 lamp, however I noticed the ballast had 18W written on it for the lamp wattage. The lamp fitted was a 26W one, and the replacement I was going to fit is a 26W...
  7. HappyHippyDad

    Is this single phase as well as 3 phase and what is it's power rating?

    Evening all.. A friend/customer has just asked if I could connect up this commercial washing machine down at his domestic stables. He has had it in his house for 10 years. Recently it has started tripping the B40 MCB. It does not trip immediately so I don't think it is the inrush, plus it did...
  8. C

    TP&N equipment rating

    TP&N voltage ratings for products, equipments etc are expressed alternatively as 440/250VAC or 250/440VAC (or 250/440 Vac etc), or in other representations. What is the "technically correct" format and in what standard/specification is it embedded? (is it IEC60050?). Thank you.
  9. T

    Rating for Shower Isolation Switch

    I have to install a shower isolation pull-cord switch. The shower is on its own feed from the consumer unit and has its own 30A MCB. The shower unit is a Mira Event XS which has hot and cold water supply and hence consumes only 150w in normal use. The shower unit is fused at 3 amps. My...
  10. S

    Please solve this SCR Current rating confusion!

    If SCR has 9000amps at 50hz non-repetitive current rating. What will be it's non-repetitive current rating for 35uS ?? Or Can we use this SCR for 3600amps / uS for 35uS ?
  11. KeenPensioner

    Rating of RCD's

    I am an adult learner. I understand the theory behind the 30mA trip rating (for example) of an RCD but I need some help understanding what the 63A rating (for example) actually means. My understanding is that RCD's do not provide over current protection, that would be provided by MCBs (for...
  12. J

    Can someone please clarify EICR rating of these downlights in terms of fire rating

    Hi All Am continuously getting failed EICR'S sent over to quote on remedials for non fire rated downlights. These are lights in question. I see they have exposed conductors so would personally probably code 2 but what would code be for fire rating they are low voltage if that even makes a...
  13. S

    RCBO rating needed?

    Hi I’m looking for some advice on what size/rating rcbo I should have installed for a radial circuit which will be running 2 washing machines 2 tumble dryers and steam iron and steam press all domestic appliances and possible all running at a single time ? I’ve been told conflicting info and...
  14. A

    choosing cable voltage rating

    Hi, for a single phase LV installation, how do you determine whether to use 450V/750V or 0.6/1kV cable. Thanks
  15. J

    Clarifying adequate fire rating of lights

    Evening Just want to clarify what is adequate for providing fire rating for lighting. My understanding is that if in an apartment block but has concrete seperation between floors there is no need for fire rated fixtures. Guy currently has some low voltage halogen GU5.3 fittings with no fire...
  16. C

    Is this true? BS1363 current rating.

    I thought both sides could each handle 13 amps? View: https://www.reddit.com/r/electricians/comments/hpywd5/reminder_to_my_uk_sparky_friends_that_a_double/
  17. C

    16, 32 and 63 as a rating

    Why are 16, 32 and 63 amps used as an MCB rating instead of 15, 30 and 60 amps? Best theory that I can come up with was when the UK switched to 230 volts this was to make up for the drop in voltage but have noting to back that up. Here are the ratings I'm familiar with: View...
  18. 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/
  19. B

    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...
  20. 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...

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