[Amps] what is a 4 wire 240VAC service?

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Sun, 3 Apr 2011 17:27:37 -0700 (PDT), Roger Parsons <ve3zi at yahoo.com>
wrote:

>(1) When it became clear, probably close to 100 years ago, that 120V was too low a voltage to efficiently power room (or tubes with handles) heaters and similar equipment, why did North America not follow the rest of the world and move to a 230V system? That is, a 3 wire 230V AC service.

REPLY:

Good question. I wonder what the accidental electrocution rate is in
countries using 230 V. 

73, Bill W6WRT