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  1. Pat H

    smoke alarm hush switch

    I think as long as one of the wired alarms has the radio link base you can then use the radio link hush, test and locate unit to control all of them.
  2. Pat H

    Flat roofs, celotex and downlights...

    Yes the effect on a few downlighters on the whole ceiling U value is negligible. But you will end up with cold spots round and of the DLs and depending on the design of the DL you may well punch a draught hole straight through from the air gap to the room. Its a real issue. I've tended to stick...
  3. Pat H

    What reference method

    102 I'd go with.
  4. Pat H

    A little help with some NVQ level 3 portfolio questions!

    Earthing and bonding. Check isolators and MCBs Then I guess safe isolation procedures.
  5. Pat H

    Pete's Videos Who needs to go on electrical courses when you can do it like this Muppet

    To be fair he did use a multimeter which thousands of DIYers wouldn't have bothered with. So although he couldn't measure low resistance effectively he did try.
  6. Pat H

    Spanish Practices / Hot tubs?

    Its Spain. isn't everything supposed to be hot to the touch!
  7. Pat H

    Voltage Optimisers is this going to save you ££££ what do you think

    And as important if not more. Don't thrash the van at 80mph down the motorway. Its basically a motorised brick and the lost fuel as you push it past 40-50 MPH really stacks up. I know hourly rates are high but the 10 mins you save on a drive are blown in fuel and wear and tear.
  8. Pat H

    Understanding Earth/Shock

    How can you be sure no part of the loft is earthed already? No pipework there? no wiring that is already earthed? No aerial feed for the TV? Lots of potential earths around and any damp can help lower the resistance. Also even if completely isolated touching a high voltage will have some...
  9. Pat H

    Changing a plug by the builders

    Its ok they don't work much in the rain anyway.
  10. Pat H

    Caravan fixed heater with 13A plug, should it be PAT tested?

    PAT testing is often done in a haphazard and routine way in setups like this. People are happy to see a correctly dated sticker and I've seen people just update stickers. I'd be most surprised if the unit isn't supplied by an RCD so as additional protection the risks are lower. However its not a...
  11. Pat H

    Stroma Certification Scheme Stroma Assessment completed

    Same for me. Mainly so I can sign off a whole lot of work at home. But now extending out to odd jobs as well. Assessment went well for me and the whole process was well handled. I'd strongly recommend them as well.
  12. Pat H

    Lights problem with LED lamps not turning off

    What about BS7672 or whatever it will be :-)
  13. Pat H

    Lights problem with LED lamps not turning off

    To add an additional variable. Many LED drivers work from 110V to 240V so at 209V its more than happy.
  14. Pat H

    Lights problem with LED lamps not turning off

    209.714V I calculate...
  15. Pat H

    Sealing Junction Boxes with Silicone !

    Maybe just seal the entry holes to they JB and a thin smear round the cover edge. So not in direct contact with connections just keeping it dry inside.
  16. Pat H

    Lights problem with LED lamps not turning off

    That's a valid point but easily solved if needed. There are already various supply solutions that offer redundant backups. A second parallel convertor that waits to switch in. The other advantage of 12V distributed would be the ease of adding battery backup for power outages.
  17. Pat H

    Lights problem with LED lamps not turning off

    Interesting trying to find why 3% was the chosen max volt drop for lighting. Not been able to uncover why that was decided. But I imagine its to allow for older lighting that has no self regulation properties. Like resistive loads. But now we have LED lights that have to convert to constant...
  18. Pat H

    Lights problem with LED lamps not turning off

    One solution would be to drop the 230V locally for distribution. So a feed to say 1st floor lights. Drops to 12V then switched and distributed. Cable runs would be short and you'd still be ensuring all user accessible items were at 12V not 230V.
  19. Pat H

    Lights problem with LED lamps not turning off

    Not sure the 3% VD would be relevant for a 12V feed? The 12V will be dropped even lower in the LED anyway. Looking online the 12v LEDs will run at 10V or less. So assuming you use 1.5mm cable you have approx. 14A to play with that's over 20 lamps.
  20. Pat H

    Lights problem with LED lamps not turning off

    A lots lost in the in lamp voltage conversion. Replacement LED lamps to replace the old 12V dichromic ones (typically 50W each so 4A) are 3-6W at 12V. Its less efficient because we are sending 230V and having to drop to a few volts.

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