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: 3.2. Tension Relieving

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.)

(introduction...)

Introduction

1. Elementary Knowledge of the Connection of Lines for Mobile Devices and Appliances and their Use

2. Treatment of Lines for Mobile Devices and Appliances

2.1. Removing of Insulations

2.2. Preparation of the Conductors for Further Processing

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

3.2. Tension Relieving

Why is tension relieving required with mobile devices and appliances?

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- Tension relieve is possible inside and outside the connection space of mobile equipment.
- Tension relieve must act immediately on one cable and not on intermediate layers.
- Mostly, tension relieve consists of one pressure clip with two fastening points. (See Figure 21).
- If tension relieve cannot be given within the connection space, it must be done outside at the casing or construction part of the device or appliance. However, the protective system of the device or appliance must thereby not be reduced.

Figure 27 Tension relieving within the connection space of a protective contact flexible cable

1 protective contact connection, 2 external conductor, 3 tension relieving, 4 protection against buckling

Figure 28 Tension relieving at an engine cable

1 clamping box, 2 cable entry,
3 tension relieving clip,
4 bow for tension relieving,
5 engine cable

Figure 29 Trumpet-shaped entry at an explosion-proof lamp which is mobile to a certain extent

1 lamp casing, 2 trumpet-shaped entry, 3 tension relieving clip. 4 supply line, 5 screw with triangular heads

What is the importance of protection against buckling at device and/or appliance entries and exits?

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Boltings which only serve the observance of the protective system or degree of protection of the device or appliance must not be used for tension relieving.