1. T

    Electrical symbols

    Hi there! I wonder what this electrical symbol means... Thank you in advance!
  2. Z

    Replacement of old honeywell thermostat with mc6 wifi thermostat

    Hi Guys, Hopefully you can help? I just wanted to get some advice on the wiring of the new MC6 WIFI thermostat? I have attached a picture of what I am replacing and the wiring diagram of the new Thermostat. Please also see recorded voltage readings I have taken. Current Honeywell Stat :=...
  3. L

    Industrial There is a one circuit (one voltage source), two phases and neutral, but there is an amps difference between Ph1 and Ph2 (minor 3A only).

    Hello Electricians, This is my first post and I'm glad to be one of this forum member. However, to clarify my question. I've a "Skin Effect Heating System", fed by 1240 V. The circuit is quit simple, Phase U, Neutral in the middle and Phase V. Phase U and Neutral feeding the heating cable#1...
  4. A

    Emergency Stop Switch KJD17B NVR Source URL:

    I want to make a power tool extension lead using an Emergency Stop Switch KJD17B NVR. However, this is a momentary switch (not latched) so the supply is not constant. Do I need the switch to operate relays that will feed a constant 240V? What would the wiring diagram be? what relays would I...
  5. J

    How does one HALF CUT solar module affect the other modules in the string when it is partially shaded?

    Hello everyone, I have a fairly technical question. I wonder what will happen to the efficiency of the PV system when we shade the bottom of one solar module (HCC) connected in series? Will the performance of the entire string decrease by half because only the top works in this module? Isn't it...
  6. C

    Earthing neutral in a multi source system

    This has me clueless. Why must the neutral be unearthed at the transformer and generator and only allowed earthing at the switch-gear? I can't see any reason because the neutral will normally not be carrying any current and thus no parallel current paths would form.
  7. J

    Source of backbox with 'skirt'

    Does anyone know of a source of a dual socket back box with an extended 'skirt' (see photo) The broken one is on a concrete wall with the feed through a hole in the wall at the top of the skirting so other options are limited. Thanks Jim
  8. B

    Source on radio changes by itself

    Hi there, I am having an issue with my 2014 Honda Vezel where the source on the radio would change by itself, that is, it would jump from FM to AM on its own. Could someone advice me on what I should look for and how I can diagnose the issue.
  9. S

    electrical consumption of an air source heat pump, Ontario Canada

    Hi - No idea if I am writing in the right place. Please, I cannot get a straight answer when the temperature is 0- -20 Celsius - where can I find a chart of what normal KWhr consumption is? I think mine is using far too much electricity thanks
  10. T

    3 phase swa sub

    Just a quick one does a three phase 25mm sub main in swa 4 meters long have to be fused even thou it comes from a bs1361 100amp services fuse then from a standard three phase isolation switch fitted from electricity company? Being swa and 25mm in size would this be acceptable?
  11. N

    There was mirror with led lights,with no switch for the light from the power source .can rocker switch be use (240v Ac power soutet

    There was mirror with led lights,with no switch for the light from the power source .can rocker switch be use (240v Ac power source)
  12. S

    Electrician Looking for an electrician in East London to update Helvar system

    Looking for someone to update Helvar system in East London.
  13. S

    Trying to source an item not having much luck

    Hi all I am desperately trying to source several of these Legrand RCD twin socket outlets for office 3 compartment floorboxes but not having much luck. Could anyone very kindly point me in the right direction? :) Many thanks
  14. T

    Domestic Air source heat pump heating issue

    Hi there, I have an air source heat pump with a few issues: 1. It gets stuck on defrost mode. When it goes to defrost, it gets stuck and ends up becoming an air conditioner in the depths of winter (fun). I suspect this may be a faulty valve (or what ever reverses the coolant) getting stuck on...
  15. J

    Faulty Air source heat pump

    My NIBE F2015 air source heat pump which is only 7 years old has an apparent fan motor failure. The fan turns freely and the motor starter capacitor has been replaced but the unit will still not run. Any suggestions for a fix?
  16. N

    calculating the de-rating of a cable near a heat source

    Im Working on a new build site at the moment, and the kitchen layout has changed to include an island with a hob on it. Meaning im goin to have to get power to it. The underfloor heating pipes have been run in already and the floor has been screeded. Theres about 50mm before you get to the...
  17. A

    IET study books. Help where to source decently priced.

    hi guys just about to start an electrical course and I need various IET books. 18th ed regs, on site guide ect. could anyone advise where to look for decent price? regards
  18. 1Justin

    Black PVC/conduit back boxes. - Source?

    I need black surface back boxes. PVC or ABS conduit boxes would be fine, as would metalclad, but not the crunchy ones. - There will be some conduits involved. I can find only Wickes (who sell a single outlet black box only, no doubles), same at CPC. Occasional Ebay sellers do have some with...
  19. C

    Hi, new member in need of air source heat pump help

    Hi Just signed up to see if anyone can point me in the right direction with air source heat pump for my above ground pool. It stopped working a few weeks ago and I thought the display unit had gone. However I've tried to replace it but that doesn't power up either. I've had the top off it and...
  20. M

    Trying to source coloured LED garden floodlights/similar with a catch

    Plan is to illuminate a bunch of impressive trees (including a few Californian Redwoods!) in a garden. Client wants to be able to change the colour of the lights easily and (here's the catch) independently from each other. I've found lights that look suitable in several places but they're all...
  21. A

    Domestic Installing an Air Source Heat Pump

    Hi all, Has anyone installed this air source heat pump. I found it on ebay 12000 BTU HEAT PUMP INVERTER SPLIT AIR CONDITIONING CONDITIONER WALL MOUNT UNIT | eBay -...
  22. Jackflash

    new wiring of Y plan

    Hi Guys, Does anyone have any tips on wiring a boiler with mid position valve. I've been rewiring a house and have had the job of wiring the boiler dropped on me by the plumber. I have a.. Worcester boiler Center mid position valve Honeywell RF Chronotherm 'wireless' programmable thermostat...
  23. Pete999


    Wiring Regulations - BS 7671 -...
  24. Midwest

    Free Calibration

    Hope this hasn't already been posted, Trade Skills 4 U (a forum sponsor) are offering free calibration at their new Warrington facility; Free Calibration Morning -...
  25. H

    External Cable Clips

    Hi Does anyone recommend any good external cable clips other than the standard ones with the nails. Looking for something good quality, preferably something that can be screwed in to the wall Thanks
  26. G

    Electric Underfloor Heating as Primary heat source under Engineered Wood?

    Hi all, Looking for advice, I am an experienced electrician and have been asked by a customer to install electric underfloor heating throughout a converted victorian chapel as a primary heat source. The customer is open to all options. I am intending to have a professional appraisal from a...
  27. Dan

    Who Are Our Resident Green Energy / Solar Experts?

    Just wondering who our resident solar experts are.
  28. M

    Distribution Board, Blakley, MDA, 1600A 4P Incoming MCCB

    Hi everybody! We are selling used Standard 1600A Mains Distribution Assembly In order to maximise the flexibility of standard high current MDAs, the incoming and outgoing MCCBs incorporate electronic trips, which can be easily adjusted on site from 40% to 100% of the nominal rating. The...
  29. J

    NICEIC Certification Scheme safe isolation- the niceic way!

    niceic initial assessment tomorrow! woop woop Seek permission to isolate isolate, locked off with signage- keep key on you prove my gs38 approved voltage indicators on a known source (will use supply side of main switch?) test between L-N,L-E,N-E for voltage re-prove voltage indicator on known...
  30. D


    I need to replace some 12v outdoor PIR`s formerly made by Smiths, then Timeguard. The CODE is SL099 easily found on Google. However, they are nowhere to be had as they have been discontinued. They send a signal to the mains control box (CODE SL055) which controls up to 3000W of lighting and...
  31. F

    Display energy certificate open source software

    Dear all, I am a student and as part of my thesis there is a high need to perform a DECs calculation on a set of buildings. Of course the overall process is not related to a commercial process and therefore this is not related to the standardized method. So my question is if there are open...
  32. S


    Hi can anybody recommend some software iMac compatible for to edit the architects drawings, basically to add the electrical drawing details to drawing sent over?
  33. H

    Halogen gy6.35 Light Source

    For a project at university I need a fairly intense light source for a fluid dynamics experiment, as the previous one broke. I've been advised a halogen source of around 50W should be sufficient, though as I am a mechanical engineer, my electronics understanding is very basic. Through basic...
  34. B

    10 way c/u with main switch on the left?

    Hi All, First post on here! I need a 10 way c/u with the main switch on the left. MK does one but I've read some pretty damning reviews. There's also a brand called Techna that do one, but I can't find anything on that one. Any advice would be much appreciated. :stooge_curly:
  35. S

    Mains hook up problem. Is this possible?

    I would like to be able to plug a mobile catering trailer up to a mains source. The trailer is behind a hire shop and the manager has agreed to come to an arrangement that will allow us to hook our trailer up to his mains if I can find out how to do it legally taking into consideration all the...
  36. S

    Air Source Heat Pump Cylinders - new, hybrid techology, MCS pending. Your thoughts?

    Giona UK - Electric Water Heaters Hot water only. 900 watt pump on the 300 litre version. COP of 2.98 Am told this is new tech because it combines the heat pump with a cylinder. Will it get MCS? Will there...
  37. G

    Eaton rcbo

    Hi dudes. Need to source a mem/ eaton rcbo for a new shower. Do you think I should sack it off and fit a separate rcbo shower consumer unit ? Thanks
  38. O

    Domestic [Need Advice] Reuse phone chargers

    Hi everyone, I'm making a house model in which I use one VAC bulb and another one but uses DC source. What blocking me at the moment is the electric source of the VDC bulb. I want to use circle in phone charger (I have many of them, ones of Nokia 12xx) to transform VAC into VDC and I tried but...
  39. W

    Panel/Convector heater?

    Have a customer with no heating at all in 2 of her bedrooms ( No gas supply also ) both rooms are around 6 x 3 meters .. Any suggestions for a decent panel/convector heater that will heat these rooms adequately?
  40. T

    LED Driver

    Hi All I have never posted before but i need some advice, I need to source a LED Driver my wholesaler says that it cant find it the driver in question is AC Adaptor 24v dc 2 amp the above is what it says on the driver it self the driver is used on a led round feature in a retail unit Can...
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