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National standard for quality requirements of low voltage power cables

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National standard for quality requirements of low voltage power cables

作者: Release Date: 2018-07-03 Author: Click:

National standard requirements for quality of low-voltage power cables (2)

Requirements for conductors

The national standard requires that the copper used in the cable conductor should be annealed copper wire. Unless otherwise specified, a single wire in a conductor may be an untinned or tinned copper wire. Tinned copper wire should be covered with an effective tin layer.

A spacer made of a suitable material can be arbitrarily formed between the untinned or tinned conductor and the insulation.

2. Requirements for insulation

The insulation should strictly comply with the national standard vulcanized rubber mixture corresponding to each model.

Silicone rubber insulated cable-IE2 type

Ethylene-vinyl acetate rubber compound or insulation composed of similar materials-type IE3

Insulation of ethylene-propylene rubber mixture or similar materials-type IE4

This is true regardless of whether the package insulation is single or multiple layers, or wrapped tape, the insulation should be tightly wrapped around the conductor or insulation. Insulation should be guaranteed to be able to be peeled off without damaging the insulation, conductor, or tin or metal plating.

The average value of insulation thickness should be greater than or equal to the specified value of cable insulation for each model required by the national standard. The insulation thickness of wire and cable manufacturers at a certain point may be less than the specified value, but not less than 90% -0.1 mm of the specified value.

In the normal temperature range, the insulation should have sufficient mechanical strength and elasticity.

3. Requirements for filling

The filling material can be a mixture of vulcanized or unvulcanized rubber, natural or synthetic fibers, or a paper tape.

The filler should fill the space between the insulated cores to form a substantially round cable core. And the filler can ensure peeling without damaging the core. The filler can be tied to the core with a film or tape.

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4 Requirements for sheaths

The sheath material should be in accordance with the vulcanized rubber mixture corresponding to each type of cable in the national standard.

Rubber Compound Sheathed Cable-Type SE3

Neoprene mixture or other equivalent synthetic elastomer sheathed cable-type SE4

The national standard stipulates that each type of cable jacket should be composed of a single layer or a double layer (that is, an inner layer or a jacket, an outer layer or a jacket).

Single-layer sheath requirements: The sheath of a single-core cable should be covered on the insulated wire core and covered by a single layer; the sheath of a multi-core cable should be covered by a single layer on the core and the filler, and the sheath can Ensure normal peeling without damaging the core. A tape or film can be wrapped under the sheath.

Double-layer sheath requirements: The inner sheath can be wrapped with a layer of scraping tape or equivalent tape. For a tape or insulation layer with a thickness not exceeding 0.5 mm, it can be included in the thickness measurement of the sheath, but The premise is that the tape should be bonded to the inner sheath; the outer layer or sheath should be wrapped outside the inner sheath or tape, which can be bonded to the inner sheath or tape, or not adhered. The inner protective layer should be clearly distinguished from the inner protective layer; otherwise, it should be easily separated from the inner protective layer.

Thickness requirements: The average value of the thickness of the sheath should not be less than the specified value of various types of cables specified by the national standard. Unless otherwise specified, the thickness at any point may be less than the specified value, but not less than 85% -0.1 mm of the specified value.

According to the national standard, the sheath must have sufficient mechanical strength and elasticity within the normal use temperature range.

5 cable test

Electrical performance: The cable should have sufficient dielectric strength and insulation resistance.

Outer dimensions: The average outer dimensions of the cable should be within the national standard range. The difference in outer diameter between any two points measured on the cross section of the same round sheath cable should not exceed the upper limit of the average outer diameter specified 15%.

In terms of mechanical strength: it should meet the bending or other mechanical stress caused by normal work.


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Keywords: wire and cable manufacturers , Zhengzhou wire and cable , Henan wire and cable

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