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close this bookHandling 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.)
View the document(introduction...)
View the documentIntroduction
View the document1. Fundamentals for Handling and Connection of Cables and Lines for Fixed Laying
View the document2. Handling of Cables and Lines for Fixed Laying
close this folder3. Connection of Cables and Lines for Fixed Laying to Electrical Equipment
View the document(introduction...)
View the document3.1. Making Screw Joints
View the document3.2. Criteria for Clamped Joints in Electrical Installations
View the document3.3. Pressed Joints
View the document3.4. Making Wire-wrap Joints
View the document3.5. Making Soldered Joints

1. Fundamentals for Handling and Connection of Cables and Lines for Fixed Laying

Classification of lines (survey)


Figure

Insulated lines

- Conductors are provided with plastic or rubber insulation (conductor insulation).
- Several conductors are stranded and sheathed by a common insulation (insulation sheath).

Bare lines

- Uninsolated conductors.

Lines for fixed laying (solid system of laying)

- Lines are fixed (permanently installed)

Lines for non-stationary laying (connection to portable equipment)

- Flexible (movable) insulated lines.

Features of lines for fixed laying

- Conductor of lines for fixed laying

- Conductor

· single wire, code designation (e)
· multi-wire, code designation (m)
· round, code designation (r)
· segmental, code designation (s)

- Wire insulation and insulation sheath can be slightly bent. (Bending radius to be considered)

- Line is intended for single laying and subsequent continuous operation (in unchanging position).

What is the difference of lines and cables for fixed laying compared to those for connection of non-stationary (mobile) equipment?
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Examples of applications of cables and lines for fixed laying

Type of line

Indoors

Outdoors

Applications


dry

humid

wet



Plastic insulated wire

+




Installations, switchgear and distribution systems; light fittings

Plastic cables and plastic-sheathed cables

+

+

+

+

Installations of any kind

Installation wires

+




Concealed installation


Figure 1 Plastic-insulated line, single-insulation, single-wire, (Cu - NY, Al - NAY)


Figure 2 Plastic cable, double-insulation, multi-wire, (Cu - NYY 1 x 50 mm2, Al-NAYY 1 x 50 mm2)


Figure 3 Plastic cable, multiple insulation, multi-core, single-wire, (Cu - NYY-I 4 x 2.5 mm2 re, Al - NAYY-I 4 x 2.5 mm2 re)


Figure 4 Plastic cable, multiple insulation, metal sheath, three-core, multi-wire, Al conductors

What are the criteria for the selection and application of cables and lines for fixed laying?
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Operations required before the connection of the lines

- Bending of lugs
- Pressing-on of cable eyes
- Making pressed joints of conductors
- Soldering on conductors