ATTACHMENT B

207 The four-letter exchange cable code (including
some reserve letters of the code and
superseded designations) is shown in Table E.
I FIRSTLETTER SECOND LETTER'
THIRD LETTER
I I
SEQUENCE OF
TYPE OF
GAUGE
STANDARDIZATION
INSULATION
Alphabetic
progression
from A
A
B
Reserved
Polyethylenepolyvinyl
chloride
(PE-PVC)
C ExpandedPolypropylene
(propylexl
D Pulo
E
F Reserved
G
HZ Solid Polyethylene
J Solid Polypropylene
K3 Solid Polyethylene
13
16
17
19
20
22
24
26
28
M
T
CONDUCTOR
_.
FOURTH LETTER
TYPE OF
SHEATH
A4 Alpeth
C Stalpeth
D5 Lepeth
E Polyethylene-
Jacketed Lead
F
G
H
J
K
L6
M
N'
R8
S5
T
U
W
Polyethylene-
Jacketed
Lepeth
PAP
PASP
Tolpeth J
Tolpeth K
Lead
Alvyn
Stalvyn
ARPETH
Self-supporting
ARPAP
ARPASP
ASP
Note I: The second letter of the exchange cable code was formerly used to indicate the dielectric strength
of its insulation (conductor-to-conductor) the letters S = 350 Volts rms. and N = 500 volts rms.
Note 2: Also indicates dielectric strength between conductors: lg-gauge, 10,000 volts dc; 22-gauge, 8,000
volts dc.
Note 3: Also indicates dielectric strength between conductors: 24-gauge. 5,000 volts dc; 26-gauge, 3,000
volts dc.
Note 4: A modified alpeth sheath is also provided for use wik waterproof cables.
Note 5: From 1947 to 1952 the letter S designated lepeth sheath. In 1952 the letter D was adopted for
lepeth sheath. The letter S was adopted for self-supporting sheath in 1964.
..
1
Note 6: In the past, the letters PL were used to identify lead sheath.
Nore 7: Stalvyn sheath is rated MD and replaced by Sealed Alvyn (M).
N@e 8: Superseded by alpeth sheath with cormgated aluminum. ARPETH sheath was manufactured from
J&uw 1971 through December 1971 in lieu of alpeth sheath with flat aluminum.
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