MIL-DTL-27500H
4.5.2. Calculated. The finished cable maximum weight shall be calculated by the following procedures. If fillers/binder tapes
are used, the maximum calculated cable weight shall be increased by 7 percent.
a. Unshielded and single shield cables.
Cable weight (lbs/1000 ft) = (W x 1.02 x n) + K x d (2.23 x d + b x B) +2720 x t x S (b x B +4.45 x d + 2 x t)
b. Double shielded and jacketed cables.
Cable weight (lbs/1000 ft) = (W x 1.02 x n) + K x d (8.91 x d + 2 x b x B + 3 x t) + 4760 x t x S ( 7 x d + b x 6+ 3.5 x t)
c. Double shielded single jacket.
Cable weight (lbs/1000 ft) =
(W x 1.02 x n) + Kx d (2.23 x d + b x B) + K x d (6.68 x d + b x B) + 2720 x t x S (b x B + 8.90 x d + 1.5 x t).
Where W = Maximum weight of component wires, pounds/1000 feet.
b = Maximum dimensions of components wires, in inches.
n = Number of conductors in the cable.
d = Shield wire diameter, in inches, or 0.0019 for flat strands, and 0.0 for unshielded.
t = Minimum jacket wall thickness from 4.3.12 ( = 0 for unjacketed cables).
B = Effective geometry factor from column B of table IV.
S = Effective specific gravity of jacket material from table X.
K = 14,570 (18,500 for flat strands) for copper shields and 12,750 (16,200 for flat strands) for
stainless steel shields (90% minimum shield coverage) or 12,750 for copper shields and 11,150
(14200 for flat
strands) for stainless steel shields (85% minimum shield coverage).
4.6 Flammability. Finished cable shall be tested in accordance with ASTM F 777 . The period of flame application shall be 30
seconds for cables having components of size 10 AWG or smaller. Cables with larger components shall not be tested.
4.7 Continuous lengths. Unless otherwise specified in the ordering data (see 6.2), the inspection requirements for continuous
lengths (see 3.13) shall be satisfied by the suppliers certificate of conformance and the presence of the required individual length
markings on the spools or reels when required by the acquisition requirements
(see 6.2.1 h). However the government reserves the right to examine the actual lengths of each lot to assure compliance.
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