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I dont know this answer?

why were the old wires changed to new wires?
EH, May 2009
Which country are you in?

What are you calling Old Wires?

What are you calling New Wires?

Are you talking about Wires Generally or Specifically?

Are you talking Wire Colours or just replacement cabling?

http://en.wikipedia.org/wiki/Electrical_wiring

Peccavi, May 2009
If you mean the colours, it was to bring them in line with Europe.
IMO we should have kept the old colours - when they get dirty and in the dark, brown black and grey will all start to look the same.

Adam, May 2009