Code: P = power, N = neutral, E = earth or ground
So a P+N+E cable would have one pin with power (1 phase), one with neutral, and a ground. and a 3P+N+E cable would have three powered pins (3 phase) with a neutral and ground.
Color Coding Based on Voltage (not power)The color code is based on the voltage and possibly the frequency (Hz) of the power going over the cable. The diameter of the plug is for the amps running over the plug. | Voltage range | Frequency range | Colour code |
|---|
| 20–25 V | 50/60 Hz | Purple | | 40–50 V | 50/60 Hz | White | | 100–130 V | 50/60 Hz | Yellow | | 200–250 V | 50/60 Hz | Blue | | 380–480 V | 50/60 Hz | Red | | 500–690 V | 50/60 Hz | Black | | - | >60–500 Hz | Green | | None of the above | Grey |
Pin Out Logic: The location of the ground pin to the "key-way" helps set what kind of VA's the plug can handle.
| 2P+E (4 o'clock) | 100-130 VAC | | 2P+E (6 o'clock) | 200-250 VAC | | 3P+E (6 o'clock) | 380-415 VAC | | 3P+N+E (6 o'clock) | 347/600 |
Ground pin
location | Pin configuration (P: power, N: neutral, E: earth or ground) |
|---|
| P+N+E, 2P+E | 3P+E | 3P+N+E |
|---|
| 60° / 2h (2 o'clock) | >50 V 300–500 Hz green housing | >50 V 300–500 Hz green housing | >50 V 300–500 Hz green housing |
|---|
| 90° / 3h (3 o'clock) | 50–250 V DC | 380 V 50 Hz
440 V 60 Hz | 220/380 V 50 Hz
250/440 V 60 Hz |
|---|
| 120° / 4h (4 o'clock) | 100–130 V AC yellow housing | 100–130 V AC yellow housing | 57–75/100–130 V AC yellow housing |
|---|
| 150° / 5h (5 o'clock) | 277 V 60 Hz | 600–690 V AC black housing | 347–400/600–690 V AC black housing |
|---|
| 180° / 6h (6 o'clock) | 200–250 V AC blue housing | 380–415 V AC red housing | 200–240/346–415 V AC red housing |
|---|
| 210° / 7h (7 o'clock) | 480–500 V AC black housing | 480–500 V AC black housing | 277–288/480–500 V AC black housing |
|---|
| 240° / 8h (8 o'clock) | 250 V DC | | |
|---|
| 270° / 9h (9 o'clock) | 380–415 V AC red housing | 200–250 V AC blue housing | 120–144/208–250 V AC blue housing |
|---|
| 300° / 10h (10 o'clock) | | >50 V, 100–300 Hz green housing | |
|---|
| 330° / 11h (11 o'clock) | | 440–460 V 60 Hz red housing | 250–265/440—460 V 60 Hz, red housing |
|---|
You could also look at this in a clock view, where the 1h-12h (1 o'clock to 12 o'clock) location of the ground cable provides the following power outputs: 
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