understanding

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  1. B

    Plugs and Fuses - Help understanding symbols (PC/Monitor)

    I have a question which is confusing me and I cannot find a definitive answer and I hope someone can help. So I have a PC and Monitor and I have misplaced the IEC cables in a house move.(Somewhere in a box labelled cables hopefully) My question is I have found this spare on one a box. (see pics)...
  2. A

    I've burned two SONOFF already and I need help understanding why

    Hi everyone, after temporary removing a Sonoff that I've installed years ago to do some painting, I'm unable to get everything back to work. I've already burned two of them during my tries and I need help understanding why. On the wall I have two switches, one turns on the patio light, the...
  3. Audronius

    New property - looking for help understanding the heating system

    Hello! I've just moved in to a new property with "all electric" heating system and trying to figure it out. The agency/landlord are of no help so trying here. Previously only lived in properties with the usual gas combi boilers so a bit lost. It's a one bedroom flat with two of us living here...
  4. 1

    Help Understanding EICR

    I would greatly appreciate if someone could help me understand the following outcomes on an EICR. I am being advised it needs a total rewire but I am a layman. The wiring is approx 30. Years old. 4 circuits, 2 x lights, one mains (incl kitchen), one for living room. We will be renovating the...
  5. B

    Positive earth understanding

    This is really embarassing i cant get my head round Positive earth So have a classic with spotlights that are relay switched at the the loom i have -12 volts so would it be as simple as grounding the other wire after it passes through the bulb So is it -12volts like a negative potential of 12...
  6. Pegasus

    Understanding terminology, schemes, cert, notifiable?

    I haven't fully understood yet the process of certification, notifiable works, LABC, schemes, and how they all tie up together. Where can I read more about such terminologies, or what do they mean, do you need to be registered on a scheme to operate or even write out an EICR? If you don't want...
  7. OnlQQker

    Just When I Thought I Was Understanding Electrics To A Small Degree...

    I go and watch something like this...
  8. A

    Help with understanding the wiring

    Hi, Need some help understanding the wiring of the bathroom lights at my place (in Singapore). I had a look at the wires near where the light bulbs are and couldn't make sense of the pairs of what I assume to be neutral (black) and ground (green/yellow): The left side I assume is coming from...
  9. C

    Help understanding AC motor diagram please

    hi can I anyone help me understand wiring one of these l, also what capacitor needed. I want to use with a speed controller. To be used on DIY reeling machine Any other tips thanks in advance.
  10. HappyHippyDad

    Understanding EV testers?

    I need to buy an EV tester in order to carry out all the required tests. I'm just a little unsure about one or 2 things... 1. Is an EV tester the same as an EV test adaptor? These terms seem to be used interchangeably. 2. Does the EV tester actually do the tests or do you plug them into your...
  11. A

    Understanding Fire Alarm

    Hi I’m after some advice please I understanding a fire alarm system. I get how the conventional and addressable are wired. By my question is about when an alarm goes off. So... In healthy state I assume there is a 24v or 12v running through the circuit? But when alarm goes off does all power...
  12. E

    Understanding solar

    Hello, I'm looking for as much info on a solar system as possible. I use about 2000 kw per month and would like to no longer rely on municipal electricity. I dont mind connecting to the grid, but I dont want to have any electric bill. I'd like recommendations on panel brands, solar controllers...
  13. gazdkw82

    Understanding faults/readings

    A while back a had an issue with a commercial install I had done for a family members unit Long story short, 5x50w led floods controlled by 4 robus PIR detectors. Also a 3 way switch for option to turn off, perm on and PIR sensors. I tested the circuit prior to any work and all the readings...
  14. H

    Help understanding electrical panel

    I’m not looking to do any repairs. Just looking at better understanding on how my home wiring is set up. Home was built in 94’. I’m not electrical savvy, I know some things but what would be the reason to mount a main power switch(breaker)from one side of the house yet mount the sub panel on the...
  15. H

    Understanding isolated (unbonded) neutrals and grounds in panels/subpanels

    I have a question regarding the isolation of grounds and neutrals in a subpanel. First, please bear with me as I describe what I see in the panels associated with my home. I live in a mobile home. My meter feeds directly into a 200-amp cutoff panel. Within that panel are two, 100-amp breakers...
  16. HappyHippyDad

    Understanding a humidistat extractor fan with timer?

    I will be fitting an in line extractor fan in the loft to extract from a shower room. At present there is a ceiling mounted fan placed directly by a window on the other side of the room from the shower, so it is not effective. The customer wants this to be a humidity controlled fan but it will...
  17. HappyHippyDad

    Understanding the relationship between TNCS, TNS and TT

    I have never actually had to make an electrical system into a TT. I have added rods in order to get an effective Ra but never had to (for example) install a TT on a new garage or shed. It's best I give an example with regards my question.. A new garage has a supply taken to it from the house...
  18. S

    Understanding periodic verification

    I had been sent on the NIC Solar PV course last year to learn how to test the DC side of solar installations as my company are testing solar panels in social housing. Due to obvious circumstances the testing work has only started this week and as I completed the course a year ago i'm struggling...
  19. Lister1987

    Check Understanding; Minimum alarm requirements for private rent sector

    Just want someone to sanity check me here; my understanding is that battery powered detectors are not permitted in the private rent sector - they're fine if you own/live in the property yourself but the minute it becomes private rent then the minimum requirement is LD3 - Mains Powered (with or...
  20. M

    Just checking my understanding of spurs off rings

    Have 18th ed and page 505 does say an unfused spur should feed one twin socket outlet. However if a 13amp fused spur is then connected to this and then to another socket is this not permissible? I can't see any potential for cable overloading? Thanks

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