колонка 2: фаза
R (L1)
S (L2)
T (L3)

колонка 3: corrispondenza fasi in accordo con la regola dell'orologio
8
12
4

Я правильно понимаю, что фаза R (черный провод) смотрит на 8 часов, фаза S (коричневый провод) смотрит на 12 часов, а фаза T (серый провод) смотрит на 4 часа?
Написала "расположение фаз - по циферблату часов". Нормально?
И еще - почему фазы обозначены как R, S и T? Это что-то значит, или оставлять эти буквы как есть?

Спасибо.

Column 1: color = Colonna 1: colore del cavo

black = nero = R oppure (L1)
brown = marrone = S oppure (L2)
grey = grigio = T oppure (L3)

Note: oppure = or

Column 2: phase = Colonna 2: fase

R (L1) = R oppure (L1)
S (L2) = S oppure (L2)
T (L3) = R oppure (L3)

(R S T - sono le fasi di un sistema trifase.) = R S T are the phase codes for 3xphase system

Column 3: corrispondenza fasi in accordo con la regola dell'orologio

8
12
4

Colonna 3: Delta connection according to Clock Rule

Delta Connection:

on 8 phase T
on 12 phase R
on 4 phase T

Note: There is also Y connections which follow the same rule but you need 3xphase + Neutral (RST+N)

N = Neutral = Light Blue

In other words Clock Rule – это так называемое правило часов.

I hope this is useful for you.

Bye,

Taras

P.S.: Magnetic Effects of Electric Current:

http://www.tutorvista.com/content/science/science-ii/magnetic-effects-electric-current/summary.php

Regola dell'orologio = Clock Rule

According to the clock rule "When an observer, looking at the face of the coil, finds the current to be flowing in the anti-clockwise direction, then the face of the coil will behave like the North Pole. While if the current is in the clockwise direction, the face of the coil will behave like South Pole.