XPost: alt.home.repair   
   From: null@void.com   
      
   On 12/3/2013 4:36 PM, Andrew Gabriel wrote:   
   > In article<529e37f2$0$46490$c3e8da3$a9097924@news.astraweb.com>,   
   > 	bud--  writes:   
   >> The context is, specifically, in US power distribution is a split-phase   
   >> supply called 2 phase with a phase A and phase B.   
   >>   
   >> (Not "2-phase", which as you say is rather different.)   
   >>   
   >> If I remember right, construction sites may have 120/60V circuits.   
   >   
   > Construction sites here use a safety supply of 110V with   
   > earthed centre-tap, i.e. 55-0-55 for single phase and 65/110V   
   > for 3-phase, but the 0V connection is only grounded at the   
   > transformer and carried to tools as a protective ground   
   > conductor, and never used as a power conductor, so these   
   > are never described as 55-0-55 or 65/110V supplies, because   
   > there's no neutral connection. This is designed to prevent   
   > electrocution of construction workers if a tool gets dropped   
   > into a puddle or the cord is damaged or something similar,   
   > as the highest voltage to ground is only 55 or 65V.   
      
   It is what I attempted to convey it too few words.   
      
   If I remember right, there are bathroom outlets that are connected the same.   
      
   >   
   > This safety supply used to be mandatory on UK construction   
   > sites. It's no longer mandatory (that would be contrary to   
   > EU rules on movement of workers and products), but it's what   
   > you'll still find on all UK construction sites.   
   >   
      
   How does the EU get involved.   
      
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