The
electric power is distributed using a tri-phased grid.
In such a
configuration, we distinguish two voltages:
| - |
The voltage between two phases
Vpp, |
| - |
The voltage between phase and
neutral conductors Vpn, which is
the usual connection for the distribution in the house for most
domestic appliances. |
The ratio
between them is the square root of 3: Vpp
= sqr(3) * Vpn.
In European countries, the normalised low
voltage in households is:
|
|
Vpn = 230 V +6% / -10%
(i.e. ranging from 207 to 244V) |
| i.e. |
Vpp = 400 V +6% / -10%
(i.e. ranging from 360 to 424V) |
In the
US zone, there are several
standards:
|
|
Vpn = 120 V
(no more very usual) |
| i.e. |
Vpp = 208 V
(some homes wired between 2 phases ?) |
| or
|
Vpn = 236 V
(or 240 ? - Which range ?) |
| i.e. |
Vpp = 408 V
(or 416 ? - Which range ?) |
NB: Sorry, we don't have precise
information about the situation in other regions.
