Cable Diameter (30V Dc) And Transmission Distance - Dahua SD22204DB-GC Installation Manual

8 Cable Diameter (30 VDC) and Transmission
The recommended transmission distances are for reference only, and the actual conditions shall
prevail. The following table shows the maximum transmission distance of cables with certain
diameter when the 30V DC power source voltage loss rate is below 20%.
For devices powered by direct current, the maximum voltage loss rate allowed is 20%. For example,
when a device of 150W rated power is installed 45 feet (14 m) away from the transformer, the
minimum diameter needed is 0.80 mm.
In the following table, the unit for diameter is mm, and the unit for transmission distance is foot (m).
Table 8-1 Cable diameter (36V DC) and transmission distance
Transmission
Power (W)
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
100
110
Distance
Transmission Transmission
Distance Distance
(Diameter: (Diameter:
0.80) 1.00)
1357 (414) 2120 (646)
678 (207) 1060 (323)
452 (138) 707 (215)
339 (103) 530 (162)
271 (83) 424 (129)
226 (69) 353 (108)
194 (59) 303 (92)
170 (52) 265 (81)
151 (46) 236 (72)
136 (41) 212 (65)
123 (37) 193 (59)
113 (34) 177 (54)
104 (32) 163 (50)
97 (30) 151 (46)
90 (27) 141 (43)
85 (26) 133 (41)
80 (24) 125 (38)
75 (23) 118 (36)
71 (22) 112 (34)
68 (21) 106 (32)
68 (21) 106 (32)
62 (19) 96 (29)
16
Transmission Transmission
Distance Distance
(Diameter: (Diameter:
1.25) 2.00)
3313 (1010) 8481 (2585)
1656 (505) 4241 (1293)
1104 (336) 2827 (862)
828 (252) 2120 (646)
663 (202) 1696 (517)
552 (168) 1414 (431)
473 (144) 1212 (369)
414 (126) 1060 (323)
368 (112) 942 (287)
331 (101) 848 (258)
301 (92) 771 (235)
276 (84) 707 (215)
255 (78) 652 (199)
237 (72) 606 (185)
221 (67) 565 (172)
207 (63) 530 (162)
195 (59) 499 (152)
184 (56) 471 (144)
174 (53) 446 (136)
166 (51) 424 (129)
166 (51) 424 (129)
151 (46) 386 (118)