There are 19 pins in Socapex. It is 6 sets of 3 pin electrical connections and an extra ground.
For stage lighting (mains voltage) the standard pin assignments are:
| Circuit Number | Live | Neutral | Earth |
| 1 | Pin 1 | Pin 2 | Pin 13 |
| 2 | Pin 3 | Pin 4 | Pin 14 |
| 3 | Pin 5 | Pin 6 | Pin 15 |
| 4 | Pin 7 | Pin 8 | Pin 16 |
| 5 | Pin 9 | Pin 10 | Pin 17 |
| 6 | Pin 11 | Pin 12 | Pin 18 |
Pin 19 is unused, or connected to the cable screen in a few rare cases. Usually sourced from a Power Distribution Unit.
Socapex has many spiders/breakouts that can power various fixtures. Usually these breakout cables have 6 sets to correspond to the Socapex’s 6 sets of connections.