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  1. 1720117105141.png

    1720117105141.png

    • timhoward
    • Media item
    • Comments: 0
    • Category: Electrical Tools and Products
  2. timhoward

    What causes low IR readings?

    I was at the other end of the results spectrum today. As I was driving home I had a call from my "Mrs Richards from Fawlty Towers" lady, very deaf and not the simplest to work for. She lives alone in a large detached town house. Consumer unit is in "the cats room", I gave serious thought to...
  3. timhoward

    Floating Neutral

    The best way I can put it, is that your inverter is ensuring there is a potential difference of 230v between the two lines. The potential difference between either of them and earth is not defined since the system is specifically designed that earth is not referenced for safety reasons. In...
  4. timhoward

    Will you vote?

    I figure it's not the system that is broken, it's the people in it, so I will vote.
  5. timhoward

    3 phase TPN boards - earthing TT

    Ah my bad, I always get "singles" and "meter tails" backwards by number....sorry I was briefly contemplating plastic trunking and singles before deciding the conductor size was too big for that.
  6. timhoward

    3 phase TPN boards - earthing TT

    Normally I use an intermediate plastic enclosure, terminate the SWA into it, and run the cores right through the box and use a plastic coupler to the board. Though that could get a bit fun with 4 x 50 sq mm conductors! I wondered about 6181Y, wasn't sure you can get anything other than...
  7. timhoward

    1 year old immersion heater keeps tripping thermal cut out, any suggestions?

    I'll be watching this thread with interest as I've had two of these. One was bottom entry IH, and we eventually put it down to limescale on an impressive scale. The other top entry one...well...we tried 2 or 3 new stats, even in desperation tried changing the IH unit, and then the famous John...
  8. timhoward

    Floating Neutral

    I suspect your current inverters are unfortunately going to be unsuitable for anything other than 'island' off grid installations. It's crucial that inverters cannot back-feed a grid supply if the grid supply is lost, and grid-connected inverters either shut down or disconnect themselves from...
  9. timhoward

    1 year old immersion heater keeps tripping thermal cut out, any suggestions?

    Tricky one. Regarding air in the cylinder - if there's a kitchen mixer tap that's mains cold, it could be worth turning both taps on with a towel wrapped around it to force the cold back up the hot....and getting them to do that every few days to see if it changes anything.
  10. timhoward

    What causes low IR readings?

    Put it this way; if you had used a Megger 15xx, the ring circuit readings would have off the scale as it only goes up to 299M at 500v. I've spent all day getting a circuit from 0.00M to 5M before now and gone home pretty happy!
  11. timhoward

    What causes low IR readings?

    You've mentioned what I was going to mention - plaster, damp and moisture. Even though we've had nice weather it takes a very long time for things to dry out. You've also mentioned that the readings climb, and this suggests your test is drying it out. It could even be that the cables have been...
  12. timhoward

    Can I charge my caravan battery from my car alternator with a DC to DC while idling?

    That's exactly how I do it. I've wavered over the years whether a switch + relay/ ignition live source + relay / or if really pushing the boat out, a voltage sensing relay is best. Aha, it sounds as though modern leisure batteries are lithium?! I can see that adds a new factor. I've never...
  13. timhoward

    Dodgy trade pictures for your amusement! - 1 Million Views!

    This one is just strange. Crabtree Starbreaker box, Hager main switch, CGD RCBOs, one Fusebox MCB, bus bar fed from bottom of main switch into one of the RCBO's by that red wire underneath. What irks me is that it's all fairly neatly done....can't be DIY...someone knew what they were doing here.
  14. 1719775596143.png

    1719775596143.png

    • timhoward
    • Media item
    • Comments: 0
    • Category: Electrical Videos
  15. timhoward

    Replacing fused spur and hard wired kitchen appliance (fridge freezer) with a standard plug socket

    It can be easy to lose the sequence of things. If the fused spur has a neon indicator and this isn’t coming on then I wonder if -the original reason was confusion at the consumer unit, maybe the RCD had tripped as mentioned abive -an attempt to fix this resulting in fitting a non-working fuse...
  16. timhoward

    Help please, new device to me

    Many thanks for all of the replies. You lot are great. I'll take a better photo next time. My main confusion was lack of any kind of rating but it sounds as though with the cover off more should become evident. There are indeed upstream supplier fuses. The PSCC at the downstream DB is 2.7kA...
  17. timhoward

    Help please, new device to me

    This MCCB is in a distribution board in the consumer half of a substation at a school We've now tested everything downstream of this (and another 2 similar devices). My current understanding is that the maximum PSSC to operate this device a maximum of 3 times is 50% of the Icu, so 12.5kA ...
  18. 1719395987067.png

    1719395987067.png

    • timhoward
    • Media item
    • Comments: 0
    • Category: Electrical Videos
  19. timhoward

    Voltage testers - a basic question

    Some very good answers now! I guess you can think of a 2 pole tester as internally saying “if I look for a source of electricity on one pole and and a return path on the other pole, is there enough to do anything with it in the middle” It tests how the electricity will behave in real life. A...
  20. timhoward

    Voltage testers - a basic question

    I think there are two concepts here... 1 - the measurement of electricity - an alternative term for voltage is "potential difference" and I think it will help you to think of it like that. Any time we measure voltage we are measuring between two things. Any other method is unreliable and pretty...

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