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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    Posted by Simon :" The 2A the 24V coil i've got needs takes it beyond the cable rating"

    If it helps, the cable current rating is only a nominal number. The cable's actual capacity is limited only by 1) how easily it can dissipate heat to its surroundings and 2) how much voltage drop you can allow for over your length of run. For intermittent low-power outdoor use 2) is probably more important than 1).
    Will - thanks - that makes sense. I'd always understood a cable's rating was limited by heat - the momentary natures of the current in this case is never going to cause an issue with it.

    It's the voltage drop on the DC that was strange - at 12 V it made sense but as others have said, it's likely the overloaded power supplies that area causing the issue at 24V. We'll see in another week or so.
    waking up this old thread. The 12V supply had started to be unreliable again so I finally got around to trying the 500mA/50Ohm 24V coil (marked 24V 15w - so it should only need a 0.6A power supply

    My 0.88A supply wouldnt open the gate. Tried a (second hand) 2A supply but that was only delivering 20V and that didn't work either.

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