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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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Products: Dual socket with USB charger

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      CommentAuthorSteamyTea
    • CommentTimeOct 17th 2015
     
    Aren't some of these small electrical devices 'intrinsically safe' i.e. there is never enough energy/power to cause a problem?
    https://en.wikipedia.org/wiki/Intrinsic_safety
    •  
      CommentAuthordjh
    • CommentTimeOct 17th 2015
     
    Posted By: SteamyTeaAren't some of these small electrical devices 'intrinsically safe' i.e. there is never enough energy/power to cause a problem?
    https://en.wikipedia.org/wiki/Intrinsic_safety" >https://en.wikipedia.org/wiki/Intrinsic_safety

    How do you make a mains-powered device intrinsically safe without a fuse or some equivalent?
    •  
      CommentAuthorSteamyTea
    • CommentTimeOct 17th 2015
     
    By making sure that the components that can thermally fail are so small there is not enough energy to ignite anything nearby.
    That's the theory anyway.
    • CommentAuthorrhamdu
    • CommentTimeOct 17th 2015
     
    I think you nailed it, ST.

    Dimmers, shaver sockets and 12V lighting transformers are all connected to mains circuits with no extra protection.

    Some of these may contain non-replaceable fuses. But they all contain thin wires or PCB tracks which will vaporise like a fuse in case of any serious overcurrent. Net result is the same: device is destroyed, but house is not.

    Fuses are for manufacturers who don't think they can sell you the same product twice.
    •  
      CommentAuthorSteamyTea
    • CommentTimeOct 17th 2015
     
    Shaver sockets are slightly different. They have two totally independent windings, the 230V side and the 110V side (onsite transformers are the same).
    The idea is that if you touch a live wire, you just ground it and do not receive a shock.

    This is not the same as making something that is of such low energy that it cannot ignite, or goes open circuit when it fails.
    These things are well sorted.
    But I still fail to see the point of a 230V socket with a 5V charger built in.
    • CommentAuthorborpin
    • CommentTimeOct 20th 2015
     
    Posted By: SteamyTeaut I still fail to see the point of a 230V socket with a 5V charger built in.
    to be powered; mains clock, bedside light, personal phone on charge - 3 sockets required. Solutions, Double socket + Extension lead, 2x Double Socket, Double socket plus USB charger built in. Solution to real problem. Wish they were switchable though.
    •  
      CommentAuthordjh
    • CommentTimeOct 20th 2015
     
    Posted By: borpinto be powered; mains clock, bedside light, personal phone on charge - 3 sockets required. Solutions, Double socket + Extension lead, 2x Double Socket, Double socket plus USB charger built in. Solution to real problem. Wish they were switchable though.

    Hmm, battery-powered clock so can be used anywhere, definitely no phones allowed in bedroom! So there's one spare socket in our house :devil:

    (my arbitrary rules regarding airtightness mean the bedside light can't be wall-mounted, before anybody mentions that as a possible improvement, but in a normal house that wouldn't need a socket either. :bigsmile: )
    • CommentAuthorborpin
    • CommentTimeOct 20th 2015 edited
     
    Posted By: djh
    Posted By: borpinto be powered; mains clock, bedside light, personal phone on charge - 3 sockets required. Solutions, Double socket + Extension lead, 2x Double Socket, Double socket plus USB charger built in. Solution to real problem. Wish they were switchable though.
    Hmm, battery-powered clock so can be used anywhere, definitely no phones allowed in bedroom! So there's one spare socket in our house
    Phone required so not an option (don't have to get up if it rings!). Not a fan of battery clocks as I like an LED clock that is constantly lit.
    •  
      CommentAuthordjh
    • CommentTimeOct 20th 2015
     
    Horses for courses :bigsmile:
    • CommentAuthorrhamdu
    • CommentTimeOct 21st 2015
     
    Posted By: djh(my arbitrary rules regarding airtightness mean the bedside light can't be wall-mounted, before anybody mentions that as a possible improvement, but in a normal house that wouldn't need a socket either.:bigsmile:" alt=":bigsmile:" src="http:///newforum/extensions/Vanillacons/smilies/standard/bigsmile.gif" >)


    Blimey. If your bedroom is THAT airtight you'd better add an oxygen level alarm to the list :bigsmile:
    •  
      CommentAuthorSteamyTea
    • CommentTimeNov 29th 2015
     
    This has been brought to attention over at the other place:
    http://www.electricalsafetyfirst.org.uk/mediafile/100145109/web_usb-article-from-so32.pdf

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