Treatment of Lines for Mobile Devices and Appliances - Course: Basic skills and knowledge of electrical engineering. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 21 p.): 3. Connection of Lines to Mobile Devices and Appliances: 3.3. Principle Regulations for Plug-in Devices

Treatment of Lines for Mobile Devices and Appliances - Course: Basic skills and knowledge of electrical engineering. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 21 p.)

3. Connection of Lines to Mobile Devices and Appliances

		3.1. Making of Screw Fastenings
		3.2. Tension Relieving
		3.3. Principle Regulations for Plug-in Devices
		3.4. Combining of Mobile Lines to Bank Cables in Plants and Devices

3.3. Principle Regulations for Plug-in Devices

- The order of plug and socket and/or coupler socket in the circuit is determined by the direction of the power flow.

- Plug and socket and/or coupler socket must be arranged in such a way that, under no circumstances, the plug pins are alive as long as they are not plugged in.

Figure 30 Direction of a power flow

1 socket, 2 plug, 3 appliance plug-socket, 4 appliance coupler, 5 cable

- For the supply of a number of devices or appliances fixed multiple sockets with earthing contact or mobile multiple sockets with earthing contact are preferred.
- It is not permissible to use plug-in devices in connection with lampholders and of free distributing plugs, even with shock protection.
- To a plug, a coupler socket or an appliance coupler only one mobile cable is allowed to be connected.

Figure 31 Correct installation of a mobile appliance connecting cable

1 plug, 2 coupling