sebaKMT Easyflex Com - For Common Types of Cables

52 MAN_Easyflex_com_eng_01.doc
6.3 Table: NVP and
v
/
2
for Common Types of Cables
Typical propagation time
Insulation
v
/
2
,
m/µs
v
/
2
, ft/µs
NVP
Oil-
impregnated
paper
75-84 246-276
0.50-
0.56
Poly, cross-
linked
78-87 256-285
0.52-
0.58
Poly, filled with
Petrolat
96.0 314.8 0.64
Polyethylene 100.5 329.6 0.67
PTFE 106.5 349.3 0.71
Paper 108-132
354-433
0.72-
0.88
Poly, foamed 122.9 403.4 0.82
Air 141-147
462-482
0.94-
0.98