The sizes you ve given correspond to 1 40 inch and 1 60 inch.
Telephone cable wire size.
Of max overall approx part no.
Probably these looked like good round numbers to someone who was making the decision a long time ago and we ve stuck with them ever since.
International standard wire sizes iec 60228 0 5 mm.
Because of the small gaps between the strands in a stranded wire a stranded wire with the same current carrying capacity and electrical resistance as a solid wire always have a slightly larger overall diameter.
Telephone wire is typical awg 22 24 or 26.
The actual wire diameter of 14 copper wire can vary among manufacturers and wire types.
Obviously this is a circle.
Each one of the live and neutral wires has a cross sectional area of 1 5mm or 2 5mm.
If you snip one of the wires and look at one of the wires face down you will see it s cross section.
Phone cable 300ft rounded white roll 100m long 4x1 0 4 26 awg gauge solid wire round telephone cord line extension bulk rool reel compatible with rj11 4p4c crimp end connector jack tupavco tp801.
Nom pairs diameter cable weight mm mm kg km a11cw p004 01 0 5 4 5 4 38 a11cw p010e 01 0 5 10 e 8 7 112 a11cw p020e 01 0 5 20 e 10 8 172 a11cw p040e 01 0 5 40 e 14 7 350 indoor screened indoor telephone cable low fire hazard.
The diameters are almost certainly for historical reasons.
In the wire size table below give the typical diameter of 14 copper wire as 2 05 to 2 32 mm or about 0 081 0 092 inches.
These cables have a diametre in the range of 0 4 to 0 8 mm.
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Typical household wiring is awg number 12 or 14.
Telephone cables 10 5 s p e c i f i c a t i o n s anixter conductor no.
The higher the number the thinner the wire.