[Elecraft] KPA1500 AC Mains wire colours

[Phil Kane]

On 5/18/2019 4:28 PM, Clay Autery wrote:

> 230VAC on 3 wires?  Never knew they did 3 wire 220V....  I always
> assumed it was still 2 hots and ground (plus an optional neutral).

In distribution service 240V "single phase" is two "hots" (usually
black/red)plus neutral (usually white), with a physical ground electrode
(ground rod or equivalent) at the transformer and another ground
electrode at the CSED (Customer Service Entrance Device - a fancy name
for the meter plus main disconnect).  Those grounds do not carry load
current, only fault current.  Three-phase distribution obviously has
three "hots" (usually black/red/blue) with neutral only if it is
120/208V wye or one of the phases of a 240V delta service is tapped for
120/240 single phase service.    Separate grounds still apply.

73 de K2ASP - Phil Kane
Elecraft K2/100   s/n 5402

>From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon