Справочник Пользователя для Pelco C1456M-D
Pelco Manual C1456M-D (10/98)
17
Table A. Video Coaxial Cable Wiring Distances
Cable Type*
Maximum Distance
RG59/U
750 ft (229 m)
RG6/U
1,000 ft (305 m)
RG11/U
1,500 ft (457 m)
* Minimum cable requirements:
75 ohms impedance. All-copper center conductor. All-copper braided
shield with 95% braid coverage
shield with 95% braid coverage
Table B. 24 VAC Wiring Distances
The following are the recommended maximum distances for 24 VAC with a 10-
percent voltage drop. (Ten percent is generally the maximum allowable voltage drop
for AC-powered devices.)
percent voltage drop. (Ten percent is generally the maximum allowable voltage drop
for AC-powered devices.)
EXAMPLE:
A dome that requires
90 vA and is installed 31 feet (9 m)
from the transformer would require
a minimum wire gauge of 20 Awg.
from the transformer would require
a minimum wire gauge of 20 Awg.
NOTE:
Distances are calculated
in feet; values in parentheses are
meters.
meters.
Wire Gauge
Maximum distance from transformer to load
20
18
16
14
12
10
10
283
451
716
1142 1811 2880
(86)
(137) (218)
(348) (551) (877)
20
141
225
358
571
905
1440
(42)
(68) (109)
(174) (275) (438)
25
113
180
286
457
724
1152
(34)
(55)
(87)
(139) (220) (351)
30
94
150
238
380
603
960
(28)
(45)
(72)
(115) (183) (292)
40
70
112
179
285
452
720
(21)
(34)
(54)
(86)
(137) (219)
50
56
90
143
228
362
576
(17)
(27)
(43)
(69)
(110) (175)
60
47
75
119
190
301
480
(14)
(22)
(36)
(57)
(91)
(146)
70
40
64
102
163
258
411
(12)
(19)
(31)
(49)
(78)
(125)
80
35
56
89
142
226
360
(10)
(17)
(27)
(43)
(68)
(109)
90
31
50
79
126
201
320
(9)
(15)
(24)
(38)
(61)
(97)
100
28
45
71
114
181
288
(8)
(13)
(21)
(34)
(55)
(87)
110
25
41
65
103
164
261
(7)
(12)
(19)
(31)
(49)
(79)
120
23
37
59
95
150
240
(7)
(11)
(17)
(28)
(45)
(73)
130
21
34
55
87
139
221
(6)
(10)
(16)
(26)
(42)
(67)
140
20
32
51
81
129
205
(6)
(9)
(15)
(24)
(39)
(62)
150
18
30
47
76
120
192
(5)
(9)
(14)
(23)
(36)
(58)
160
17
28
44
71
113
180
(5)
(8)
(13)
(21)
(34)
(54)
170
16
26
42
67
106
169
(4)
(7)
(12)
(20)
(32)
(51)
180
15
25
39
63
100
160
(4)
(7)
(11)
(19)
(30)
(48)
190
14
23
37
60
95
151
(4)
(7)
(11)
(18)
(28)
(46)
200
14
22
35
57
90
144
(4)
(6)
(10)
(17)
(27)
(43)
T
otal vA
consumed