[asterisk-users] Why Aastra uses 48V whereas other IP Phones usemuch less, i.e. 5-12V

[Steve Kennedy]

On Thu, Nov 23, 2006 at 12:40:03AM -0800, Brad Templeton wrote:

[snip]
> The USA uses 120v for house current.  That's enough to hurt you and can
> kill you if you touch it wrong, though I've touched it a few times.
> A lot of the world uses 220.  This causes enough of a spark that they
> require all receptacles to have a switch on them so you don't plug things
> in live.  On the other hand, 220 can deliver twice the power in the same
> current.  Kettles in the 220 world are _really_ fast.  Your dryer and oven
> run on 220 even in the 110 world, only way to get enough power.  Same with
> electric car chargers.

The higher the voltage, the more chance your skin will find a conductive
path across the body that's dangerous. You only need 9uA across the
heart and it will stop - for good.


Steve

-- 
NetTek Ltd  UK mob +44-(0)7775 755503
UK +44-(0)20 79932612 / US +1-(310)8577715 / Fax +44-(0)20 7483 2455
Skype/GoogleTalk/AIM/Gizmo/Mac stevekennedyuk / MSN steve at gbnet.net
Euro Tech News Blog http://eurotechnews.blogspot.com