|Handling and Connection of Cables and Lines for Fixed Laying - Course: Basic skills and knowledge of electrical engineering. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 17 p.)|
|3. Connection of Cables and Lines for Fixed Laying to Electrical Equipment|
- For clamped connections of lamps it is important that the neutral conductor is always connected to the ring contact and the switch-lamp-wire always to the floor contact.
- Disconnection through switches is allowed for phase conductors only.
- Switches are to connected so that the so-called TRR rule is observed, i.e. the circuit is closed when the switch is in
· top position
· rear position
· right-hand position.
- For connection of switches, attention is to be paid to switch connection marks. (Always connect phase conductors to the terminals marked accordingly.)
- For connection of sockets, the phase conductors are to be clamped at the left-hand side and the neutral conductor with protective conductor function (PEN) or the neutral conductor and protective conductor at the right-hand side.
- The phase conductor sequence (e.g. in the order black, blue, brown) is to be observed when connecting power sockets and other installation units.
Figure 18 Connecting of a power socket
1 conductor 1, 2 conductor 2, 3 conductor 3, 4 PEN, phase conductor sequence, for example, black, blue, brown, green/yellow starting with conductor 1
Non-observance of the correct phase sequence within an installation will result in malfunctions, such as wrong direction of rotation of motors etc.
- In branch or conduit boxes, the phase conductors are to be connected on the left-hand top and the neutral conductor or neutral conductor with protective function on the right-hand bottom.
- If branch or conduit boxes have a fifth connection terminal, the protective conductor only is to be connected to that terminal.
Figure 19 Examples for terminal connections in branch boxes
What are the advantages of a consistent system of clamped
connections in electrical