To get a shock requires a potential difference to earth. This doesn’t have to be the earth of the socket. The ground is at the same potential difference relative to the live terminal as the earth terminal. The earth terminal is actually connected to the ground. Usually by connecting it to a water pipe or radiator.

An earth is not necessary for live and neutral to work as the dummy earth pin can be non-conductive plastic. The dummy earth pin, is so you can insert the plug into the socket as the earth pin moves the plate inside the socket opening the live and neutral terminals so the pins can go in. This is why the earth pin is longer than the other two.

Thank You
Jason Hurley
Crumplezone Multimedia
01257 416596
<www.crumplezone.co.uk>




on 27/8/14 11:04, Jones, Peter at [log in to unmask] wrote:

With sockets for three pin plugs you do need to be in contact with earth which enables live and neutral to work. This is why appliances with two cables have a dummy earth pin.
 
 


Peter Jones
Heritage Officer

Leisure
Leisure, Culture and Communities

Direct dial   01284 757163

Email [log in to unmask]

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From: List for discussion of issues in museum education in the UK. [mailto:[log in to unmask]] On Behalf Of Jason
Sent: 27 August 2014 10:40
To: [log in to unmask]
Subject: Re: socket covers!

It is not necessary to be in contact with both the live and earth terminal of the socket to receive a (potentially fatal) shock. As you can be earthed through the ground or anything else you are in contact with. If someone was to touch the live and earth (or neutral) at the same time it would cause serious burns as there would be a shorter path of lower resistance meaning the current would be much higher.

Thank You
Jason Hurley
Crumplezone Multimedia
01257 416596
<www.crumplezone.co.uk <http://www.crumplezone.co.uk> >



on 27/8/14 09:13, David Birks at [log in to unmask] wrote:
All,
 
Surely sockets are only dangerous if the child can insert a finger fully into the earthed hole while simultaneously inserting another finger into the live hole, unless my understanding of mains circuit 240 volt AC  sockets is wrong, in which case ignore this (it may also explain why I only lasted 18 months as an apprentice electrician in the early 80s). Seems very unlikely to me, and even children’s fingers are too broad. Having said that we have them in the sockets in our museum, but I’ve never known why.
 
My guess is that socket cover manufacturers push the danger factor, I also suspect they are the same people that manufacture hi-vis vests.
 
David Birks
Trowbridge Museum
 

From: Osborne, Kate [mailto:[log in to unmask]]
Sent: 26 August 2014 14:39
To: [log in to unmask]
Subject: socket covers!


Hello All



We have socket covers on all our sockets, ostentsibly to prevent small children electrocuting themselves.   Others now tell me that they aren’t necessary and can even be dangerous.   The attached articles look persuasive.  Has anyone else wrestled with this issue and come to a safe conclusion?   Will circulate answers to all..... many thanks, Kate





http://www.patmarshall.co.uk/health_and_safety/socket_covers.htm



http://www.telegraph.co.uk/news/uknews/5039454/Electrical-socket-safety-covers-are-absurd-and-dangerous-say-engineers.html





http://www.fatallyflawed.org.uk/







Kate Osborne| Learning & Skills Officer

Royal Albert Memorial Museum | Bradninch Offices | Bradninch Place | Gandy Street | Exeter | EX4 3LS

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