TABLE V

APPROXIMATE INDUCTANCE VALUES FOR WINDINGS OF VARIOUS ELECTRICAL APPARATUS

APPARATUS
NO. WINDINGS
DC RESISTANCE
IMPEDANCE
INDUCTANCE
(HENRYS)
(SEE NOTE 2)
NAME
CODE
NO.
AC Resistance (See Note 1)
Reactance (See Note 1)
Impedance
Freq.
Connections
Relays, AC Type 172-B 2
Inductive 540
Non-inductive2000
Comb. 406
3260 5650 6520 900 Inductive winding only 1.0
Relays, AC Type 196-A 2 1600; 1600 117500 203000 235000 900 Windings in Series 36.0
Relays, AC Type 218-B 2 117; 117 450 678 810 135 Windings in Series, Armature held stationary 0.8
Relays, AC Type J-1 1 1090 38000 39400 55000 900 - 7.0
Receivers 144 - 83 140 164 250 800 - 0.0325
Receivers 525 - 276 620 1910 2000 800 - 0.38
Receivers 528 - 56 106 237 260 800 - 0.0475
Receivers 557-B - 30 46 110 120 800 - 0.022
Retardation Coils 5-U 2 (1-2) 500
(2-3) 500
- - - 16
16
Single Winding
Series Aiding
3.0 to 4.0
12.0 to 15.0
Retardation Coils 5-AA
77-A
2 74 ea. - 270 - 16 Two windings as connected for 1 wire 2.7
Retardation Coils 12-A 1 165 - 5024 - 800 - 1.0
Retardation Coils 44-D 2 83 ea. 2480 39565 39580 900 Windings in series 7.0
Retardation Coils 47-B 1 150 160 1700 1710 900 - 0.3
Retardation Coils 57-B 2 175 ea. 1620 22610 22700 900 Windings in Parallel 4.0
Retardation Coils 82-H 1 (tapped) (1-8) 25.2 47 1640 1640 1800 Entire winding 0.145
Retardation Coils 182-B 1 (tapped) (1-8) (30.0) 56 1640 1640 1800 Entire winding 0.145
Note: (1) Impedance and impedance components are discussed in Chapter XVI. A.C. Resistance or the resistance component of impedance is often widely different from the resistance to direct-current flow.
(2) Inductive values vary greatly depending upon conditions under which apparatus is operated, age of iron, degree of saturation, etc. This table gives only representative and approximate values.

Page [ 63 ]
Taken from

Principles of Electricity
applied to
Telephone and Telegraph Work

L.L. Dept. AT&T Co.
1938 Edition
(Reprinted with corrections January, 1941)