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  1. 1Justin

    Circuit help

    Kirchhoff is really "common sense" applied to Ohm's law. Once you get that it's all the same thing. Tutors may get a bit ---- about it so I understand your point. In this case Kirchhoffs "laws" are used in the way I did it also. (Not being a law at all really- just being a rather obvious...
  2. 1Justin

    Circuit help

    Let's start you off then. Get your pencil. Name the voltage where the resistors join (for the sake of argument call it V2). Name the current in the left hand resistor I1 and in the right hand resistor I2. Remember Ohm's law. That's it, it really is. - But to take you one step further.. Mr...
  3. 1Justin

    Misfired Lights

    This is a UK forum, but for your purpose it probably makes little difference. There is more than one way to correctly wire 2-way lighting, but there are numerous ways it could be wrong. One such conceivable error is as attached. A correct way is on the left, but the closest incorrect...
  4. Lights.jpg

    Lights.jpg

    • 1Justin
    • Media item
    • Comments: 0
    • Category: Electrical Videos
  5. 1Justin

    Sonoff Wi Fi DIY MINI smart switch issue.

    I ordered one two months ago to try out. It has not arrived yet from China.. Provided you are sure you have the 2-way wired correctly, then It's probably just what you get for less than a fiver :( The S1 S2 will be a very high impedance input, so there is hardly any conceivable way it would...
  6. 1Justin

    Green goo

    I'd give it a C3, that way you get to record it and it's a permanent record on your inspection. Di-isoctyl phthalate is toxic, endocrine disruptor, (- wear gloves). It's worth your customer knowing about it. Saying that I've always measured reliably high IR in all places I've seen this stuff. If...
  7. 1Justin

    Using existing cable

    For someone to sign it off (and so take safety responsibility) they'd not only need access to cable ends for measurements but clear enough proof of appropriate cable installation, including any joints made in it. Personally I might accept this if you were to provide adequate photo and/or video...
  8. 1Justin

    High CRI GLS bulbs. Not costing a fortune?

    Does anyone source reliable and good value high CRI led bulbs in standard GLS format (ES & BC)? - Ones which don't cost a fortune and give out good ~2700..3000K light? I have found that the fairly easily available and not too pricey Philips CRI97 "ExpertColour" GU10's make a really noticeable...
  9. 1Justin

    6381Y PVC

    That seems sensible. Thanks
  10. 1Justin

    6381Y PVC

    Can I bump this thread please? The last batch of tails I ordered from a wholesaler turned out not to be grey sheathed BS6181Y 7 strand I ordered, but BS6004 BS6181Y BASEC 19 core. This is “flextail” from some suppliers. -But do we really see it as "fine wire" re 526.9 and ferrules? It's...
  11. 1Justin

    Hager part KRN190 neutral connecting block

    Thanks SJD. That implies it fits to the busbar. Makes sense, but why it's called a "neutral link" was what threw me. (And for Ferg, well it ought to, but that was where I found it, and it didn't in that respect :)
  12. 1Justin

    Hager part KRN190 neutral connecting block

    Who's familiar with Hager KRN190? It's called a "neutral connecting block" by Hager with no further info. This seems a maybe misnomer, but I have never seen one in the flesh.. I'm assuming it would have a lower terminal spaced to fit a standard Hager busbar prong if it were fitted like an MCB...
  13. 1Justin

    Using an front S type RCD on a TT installation

    I am, more or less. And second question.. "Results in serious injury to".. doesn't specify commercial properties. I've fitted SPD on 9 out of 10 CU's I've done since regs. The one without I did get through the risk assessment without because I could almost see the sub-station. The risk analysis...
  14. 1Justin

    Using an front S type RCD on a TT installation

    OSG suggests RCBO's on a TT without up-front S type. That's a risk you might be prepared to take, but the original reasons still stand. The other thing to think about is you are very likely to be fitting SPD in the same board, and this means more cables connected in before any RCBO's. (Often of...
  15. 1Justin

    Good cable to use outside

    I tend to use H07RN-F. It's tougher & thicker than the normal black rubber cable H05. It's rarely on the shelf, normally have to mail order it.
  16. 1Justin

    Torque screw driver anyone bother ?

    IMO it's in many cases an overreaction to loose connections which just demand more care. A set-up which assumes we are all as ham-fisted as the worst. I've found numerous completely never done up connections, and also note that torque settings by the book on screw terminals (N/E bars) with...
  17. Flat torque driver.jpg

    Flat torque driver.jpg

    • 1Justin
    • Media item
    • Comments: 0
    • Category: Electrical Videos
  18. 1Justin

    Those lovely fitting from local DIY store

    To be a lighting designer needs a sadistic tendency. Valued talents include sourcing microscopic junction boxes and screws in teeny ready to throw-away bags. After all, bell-wire fits inside most connectors adequately. Experience of the real world a disadvantage.
  19. 1Justin

    Downlights and the different varieties..

    I installed some JCC Hybrids based on their generous quoted light level and the marketing hype, using my normal rules of thumb. The output was underwhelming. I made myself go back and squeeze in a couple of extras because it was a bit embarrassing. Cost me a day that did. I won't fit those again.
  20. 1Justin

    Recommend a IP65 consumer unit please.

    Thanks Deuce. the enclosures look sound.

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