explain

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  1. David1977m

    Can someone explain what this link is in this contactor drawing?

    This is in the level 3 science material handout. I know how a contactor work and asked my tutor what the link is, he looked at it and said he doesn’t know. Can someone please explain what it is please.
  2. H

    Can someone explain this wiring?

    Hi guys, I fitted this ceiling light a few days ago for a relation and whilst there has been no issues with it, the wiring has left me somewhat baffled. Can someone explain why it has 3 earth wires? I am going to assume one is an earth for the light itself and one is an earth for the metal...
  3. ManPhan

    02 cable install in 01 MCT: please help me explain it

    • ManPhan
    • Thread
    • cable current explain help install mct measurement please
    • Replies: 1
    • Forum: The Welcome Forum
  4. R

    What would explain this strange measurement in the kitchen?

    In the breaker box of a 2010 house, there is a distinct 15A breaker for the garburator and distinct 15A breaker for the dishwasher. The garburator is powered only if the garburator breaker is on. But the line to the dishwasher is powered if EITHER the garburator breaker or dishwasher...
  5. M

    Can someone explain how these storage heaters were wired via the contactor?

    Been round to a house to quote to replace some storage heaters for new panel heaters and came across a strange (to me at least) way of wiring the old storage heaters via a contactor in the board, as usually I see their own off peak consumer unit which powers up at night via economy 7. From the...
  6. K

    Can you explain to breaker info to me?

    I am buying a house and it was built in 1949. Is there anyway I can tell if it has tube wiring without opening up the walls? Is there anything else I need to watch out for with a home built in 1949? Also can anyone explain these 2 photos to me? Does any of it explain if there is tube wiring?
  7. R

    Can anyone explain what a time delay RCD is needed for?

    I've scoured the internet for what these do and am coming up short on finding information. What are these for? (ie what specific problem are they trying to solve) and why do they need to be time delayed? Thanks in advance
  8. O

    Can anyone explain type A RCD's

    I get how they work and can kind of understand the reasoning, I remember the early "no-trip" RCD testers, D-LOG made one that saturated the RCD core with DC to stop it tripping whilst doing an earth loop test so I agree that stray DC leakeage could stop an RCD tripping. But, lets say you...
  9. J

    Can anyone explain this

    Mains supply into house is single not looped. However supply is spilt at mains fuse two 60A fuse one goes to the meter then on to the consumer unit, the other one goes into the wall completely separate from all the electrics in the house. Where is it going? And why not into a meter?. Old but it...
  10. J

    UK Could someone explain to me what the numbers on bulbs and batteries mean?

    Hello, Apologies if these are really basic questions, I know next to nothing about electronics and such. I'm quite an outsider here. I'm looking to build myself a moth trap, and I've found that (especially in today's economy) actinic bulbs running off a battery would be best as it would be...
  11. J

    Explain the process of Designing a Final circuit

    I have been given this assignment "the drawing below shows the floor plan of a small factory with the electrical symbols. Explain the process of designing the final electrical circuit that supplies all the elements 6 . The total length of the circuit is 25m. Any assumptions you have to make...
  12. J

    Can anyone explain how load management is installed?

    Hi, I've recently come across properties with high loads exceeding max demand, especially hmos I've heard about load curtailment and relays where when one heavy load is used another cannot be used. Can anyone provide information about devices used and how to wire them.
  13. BiddeldyBwah

    Can anyone explain how Klik's work?

    I'm working with these at work at the minute and they really confuse me. Unfortunately everyone is too busy to take the time to explain them properly so i'm left guessing. We have a 4 core YY coming from the board (which i've not seen), feeding a row of lights that is a mixture of emergency and...
  14. E

    Neutral went bang - can someone explain this wiring to me?

    I was wiring up an IP65 5ft LED batten today, straight swap for a non-LED version. The light was an emergency and worked off a sensor, no switch. The emergency was wired through the test switch. In the light fitting, there were 4 wires - brown switch live, black live, neutral and earth. As i...
  15. A

    Please Explain Double Insulation

    Hi, Just purchased a new wall light and it has no earth on terminal junction. Instructions say ‘double insulated - no earth required’. Here is a picture: How would this protect you if the wire from wall broke loose from this junction box and touched the casing which is metal? Or is it...
  16. S

    Just short explain of wiring

    Hello, Can anyone quick explain me this? Here in attachment there are screens of big motor where double power wires were use from frequency drive to motor terminal , i just want to know why it because bigger amperage needed to flow ? And if this same motor were used for star - delta switch by...
  17. C

    Please explain this transformer from a scientific instrument

    First post, DIY. I harvested this heavy transformer from an instrument that we took out of commission. I live in a 220v country and I want to know if I can use this safely to run 120v tools (like routers etc). 1. It states 2kv. Is this ~2000 or ~4000 watts? (i.e. do I multiply by 120 or...
  18. K

    Could I ask if you could help explain the comments re a Domestic ElCR report that has come back unsatisfactory please

    Background: I have a ex council 1st floor flat that I bought, I moved in to care for my disabled mum and so rented the flat as I could not do enough hours work and care. I was told I am a kind landlord and when asked to do things I will jump immediately as I would not like my tenant to have a...
  19. P

    Help, I’m sure someone can answer this very quickly

    Sorry, I’m new to this. Can someone just explain how I should wire these cables in the ceiling light unit as per images, there seems to be a lot of cables,
    • Pjs412
    • Thread
    • answer cables ceiling explain help images light someone these unit
    • Replies: 3
    • Forum: DIY Electrical Advice
  20. D

    Can anyone explain this reading (suspected open circuit)

    Alright troops ! First post here ! Any one come over this situation before ! Yesterday i connected an existing feed for cooker good into socket but it wasn’t working when I turned on! I tested between live and earth (240v) between live and neutral (12v ) and neutral and earth (0 volt ) I...
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