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Wires with polyethylene insulating-protective sheath for field communications

П-274 М

DESIGNATION

Wires with polyethylene insulating sheath for field communications

Wire models and their definitions shall correspond to the details given in the table below:

Model

Definition

П-274М

field communication wire

Number and rated area of conductors, rated insulation thickness, maximal outer diameter and wire weight shall correspond to the details given in the table below:

Model

Conductor

Insulating-protective sheath radial thickness, not less, mm

Insulated conductor outer diameter, not more, mm

estimated weight for 1 km length, not more, kg

Steelwire

Copperwire

Number

Diameter, mm

Number

Diameter, mm

П-274 М

3

0.30

4

0.30

0.5

2.3

15

ARRANGEMENT

CONDUCTOR:copper and steel wires, stranded between each other.

INSULATION: polyethylene

STRAND:stranding system of wires in a wire conductor shall be the following: 1+6 (copper wires shall be in outer lay-up: 2 copper + 1 steel + 2 copper + 1 steel).

Insulated conductors are stranded into a pair. Stranding direction of the pair - right.

TECHNICALSPECIFICATIONS

Direct-current electrical resistance of conductors for a temperature of +20°Сand a length of 1 km shall be not more than 65 Ω

Wires shall be resistant to the effect of ambient temperaturefrom +65°С to -50°С.

Operational wirelife - not less than 15 years.

Regulations: Technical Specifications 16-505.221-78