understanding

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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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
  9. M

    Just checking my understanding of min c.p.c csa?

    Hello all Just checking my understanding of min cpc sizing. If installing 20Amp 2.5mm TP&N circuit using armouring as c.p.c. Is 2.5mm from bango minimum c.p.c. Table 54.7 seems to suggest so? Cheers
  10. Lister1987

    Emergency Lighting - Check understanding

    Im toying with the idea of putting a maintained switched emergency light under the stairs as this is where the service head/DB is located and, in the event of a power failure I don't want to be rummaging around trying to find the torch that I know I left there but SWMBO since moved it without...
  11. HappyHippyDad

    Understanding this cylinder and the electrical requirements?

    I have a water cylinder to get power to. The product is a gledhill stainless lite 'indirect'. The manufacturers data sheet says for use with gas or oil boilers. The sheet says the 'direct' model has 2 x 3kW immersions. However from the plate on the side of the tank (see pic) and the tank itself...
  12. HappyHippyDad

    Understanding what this means on the megger 1731

    I am in the process of hunting for another difficult fault (intermittent tripping RCD, absolutely no faults showing on any circuits and only 2mA fault current in Main earth). My question does indirectly relate to this... perhaps. When testing the RCD with my megger 1731 I am not getting a...
  13. qaz

    trying to understand 3 phase motor/capacitor installation

    I'm a qualified mechanic but always tackled small electrical jobs without incident. wonder if i can get some advice re a 60's potters wheel. it consists of : -a 220-250 volt 3 phase, c/s 50, motor -an largish oval capacitor [with a resistor between the 2 contacts] some distance away from...
    • qaz
    • Thread
    • 3 phase capacitor installation phase trying understand understanding
    • Replies: 70
    • Forum: DIY Electrical Advice
  14. HappyHippyDad

    Understanding cable zones.....

    Cable zones are vertical or horizontal from an accessory. I was wondering how this is affected by accessories that are not visible? In theory you could have a cable going horizontal from a socket above kitchen worktop and then down to a socket below worktop which is hidden behind the washing...
  15. HappyHippyDad

    Understanding the new regulation regarding Main Bonding.

    Regulation 411.3.1.2 states .... Main bonding conductors shall connect to the main earthing terminal extraneous conductive parts. It then goes on to say... 'Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective...
  16. I

    Help understanding 2 way switching.

    so I understand how 2 way switching works up just needing some help with this. If I have a 2 gang 2 way switch, and I am taking the feed to the switch, do I link out the commons ?
  17. M

    Understanding the electricity supply to my house (pole, underground cable, meter box, etc...)

    Partly cos I like to know everything... Partly because I'm a geek... And partly because we're going to have some electrical work done on the house which has made me curious.... I'd like to know more about the feed to my house... The power lines come to us through the garden and reach a pole...
    • Max Rasa
    • Thread
    • box cable electricity house meter meter box pole supply supply to underground understanding
    • Replies: 16
    • Forum: UK Electrical Forum
  18. HappyHippyDad

    Understanding 411.3.4, RCD's for lights.

    I just wanted to make sure I understood the new regulation above. I am about to replace some ELV downlights with mains voltage, do these now have to be 30mA RCD protected? At present they have 100mA protection and the earthing is TT. Cheers.
  19. C

    Emergency Lighting - Understanding

    Kindly refer the attached Image. There are 2 Places at which I can give reference signals for Emergency lighting. 1. At MXC 2. At LTC (Unswitched & Switched) What is the difference between the above two? why there is a need to provide input at two different locations?
    • charzree
    • Thread
    • emergency emergency lighting lighting understanding
    • Replies: 1
    • Forum: Lighting Forum
  20. G

    Understanding the common wire

    Hi, I’ve asked this question to people I work with but have different answers, so thought I’d try here. What is a common wire and what does it do? Thanks.
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