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  1. S

    Interaction between loads - power quality and noise.

    Hello, Sorry if this isn't the right forum for this. Didn't look to be far off... So I'm looking for some advice please with regards to interaction between loads sharing a circuit. I understand (or think I do!) a lot of the composite concepts and I think I have an idea of what my answer might...
  2. R

    Back box fire ratings

    I carried out an install on a kitchen in a village hall a while ago I installed some deep back boxes on the brick wall but the builders then installed batons the wall and used insulation board so even my deep boxes weren't close to flush with the wall, I put in some long screws to get round it...
  3. R

    Isolator between meter and CU

    Had a discussion with a friend regards an isolator installed between the meter and consumer unit. The meter is otherwise of the wall and tails enter through the wall into a Henley block. Then the Henley block feeds 2 CUs What's your thoughts please as I want to install one and he is telling me...
  4. M

    confusing figures between net and regbook

    Hiya lads a stupid query (maybe ) i was filling in an EICR for a mate and had left my on site guide and reg book at home so i decided to check the net for max zs values for 60898 type b mcbs 6a. 16a, 32a, and 40a but the figures didnt match up with the ones in the reg book. so question what...
  5. F

    140 V between live and neutral instead of the usual 230 V

    Hi lads, yesterday morning there was a fault with the incoming electricity supply in that there was only 140 V between live and neutral instead of the usual 230 V. Could anyone provide me with an explanation for this? Thanks
  6. C

    Working live

    How many sparks would work in a square D KQ 3phase DB board if it was LIVE i was putting a new mcb in a live DB and it blown the MCCB at section board i tested between phases and there was no polarity between any conductors switched the MCCB and it tripped again WHAT COULD OF HAPPENED
  7. 2

    Link between L1 on different one way light switches

    Took a 2 gang switch off a wall in a shop to investigate after workers had complained of crackling sounds and more recently tripping of the circuit. It appeared that there was a loose termination at the L1 terminal on the back of one of the switches. The unusual thing I discovered though was...
  8. S

    Post for the old man, anyone on here work for FH wheeler between 1966-1975

    My dad was wondering whether there was any sparks, mates, people who worked for FH wheeler which later became crown house engineering I believe between 1966 onwards. It would be great to here people's start to the industry and what's been the biggest change for them present to past. Look...
  9. S

    Electrical contractor stuck between right and Fire alarm contractor perspective

    Hello all I'm new to this forum and have recently joined due to a lot of threads here have been quite interesting and many have very good answers from knowledgeable people. I've been sparking for 12 years and spent my apprenticeship with my fathers electrical company. My appretership was quite...
  10. infinity

    Extending Data cable over 270M

    HI all, We have a customer who has 2 x 50 kWp solar arrays (one with SMA inverters; the other Delta) with a 50 kW export limit. He currently has a Cluster Controller / Energy Meter set up and working fine to limit one of his 50 kWp arrays (SMA) to zero export. The customer would now like to move...
  11. buzzlightyear

    new 18th regs, coming soon to your nearest cinema soon !

    more monies down the drain .
  12. D

    LED GU10 bulbs still glowing when turned off

    Hi Guys, Just need a little advice if possible. I have recently fitted 6 GU10 Downlights 230V on a customers landing with 5W Cool LED GU10's. When he turns off his light one light is still slightly on. I know this has something to do with the two way switching for the landing and a bit of...
  13. P

    Explain the difference between a transformer and auto-transformer

    Hi there, I understand that a transformer is used to either step up or step down the supply voltage. I know that the basic principle is that if there are more windings in the primary coil than the secondary coil then, the voltage is stepped down and if there a more windings in the secondary coil...
  14. A

    3 phase quarry pump

    Latest fact finding mission for you gurus to help me learn about Todays problem was a quarry pump not running, guy went out and meggared the cable and pump and found one of the two 10mm cables was down on the black phase. So while cable was ordered up and being delivered he was called...
  15. F

    Voltage through earth to desk

    I built a metal desk with wood top. I just wired in a 500W heat lamp on the desk. 13A plug goes to a single metalclad socket via 1.5mm2 3 core cable. Same cable then goes from socket to 1 way metalclad switch. Same cable then goes from switch to heat lamp. Earths are all connected to each...
  16. P

    What is the difference between Electric Charge and Electric Current

    I understand that electric current is the flow of charge or electrons. would I be right in saying that electric charge is the ability of matter to experience force, such as attract and repulsion.
  17. G

    Potential difference between Earth and Neutral

    Has anyone ever encountered a fault with a RCD which causes a potential on earth in respect to neutral? I am a trainee electrician, working with an experienced electrician. We encountered a fault today, earth had a potential of 238V in respect to Neutral and a 0 V potential in respect to...
  18. M

    Low voltage between live and neutral

    Hello, ive just been to look at a job with a light not working, after checking found voltage between live and neutral is 170v, between live and earth is 230v, is it just a case of a neutral issue, eg, loose connection, water ingress any suggestions would be great, cheers
  19. G

    volt sticks

    Hi folks,i Admin over at the plumbing forum,quick question regarding volt sticks,in this case a Fluke brand,now i fault find boilers so am very conversant with a multi meter ,however i use a volt stick to check boiler cases and pipework,on checking the spec on the fluke they go down to 100v,as...
  20. captaincaveman

    50 volts between nuetral & earth - Lighting/ fluescents

    Hello beautiful people. Quick one for anyone who may have an idea: Attended job today with a room with 2x 5ft fluescents not working and found 50v between N-E. I did basic tests on the fittings (continuity, ir, etc) - all ok. main earth and everything else ok. Checked the light nearest the...

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