Cable Diameter (24 Vdc) And Transmission Distance - Dahua D-SD59225DB-HC Installation Manual

7 Cable Diameter (24 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 24 VDC power source voltage loss rate is below 10%.
For devices powered by direct current, the maximum voltage loss rate allowed is 10%. The cables
mentioned in the following table are all copper cables with electrical resistivity ρ=0.0175
2
Ω×mm /m.
In the following table, the unit for diameter is mm, and the unit for transmission distance is foot (m).
Transmission
Power (W)
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
Distance
Table 7-1 Cable diameter (24 VDC) and transmission distance
Transmission Transmission
Distance Distance
(Diameter: 0.80) (Diameter: 1.00)
391 (119) 611 (186)
195 (60) 305 (93)
130 (40) 204 (62)
98 (30) 153 (47)
78 (24) 122 (37)
65 (20) 102 (31)
56 (17) 87 (27)
49 (15) 76 (23)
43 (13) 68 (21)
39 (12) 61 (19)
36 (11) 56 (17)
33 (10) 51 (16)
30 (9) 47 (14)
28 (9) 44 (13)
26 (8) 41 (12)
24 (7) 38 (12)
23 (7) 36 (11)
22 (7) 34 (10)
21 (6) 32 (10)
20 (6) 31 (9)
14
Transmission Transmission
Distance Distance
(Diameter: 1.25) (Diameter: 2.00)
954 (291) 2443 (745)
477 (145) 1221 (372)
318 (97) 814 (248)
239 (73) 611 (186)
191 (58) 489 (149)
159 (48) 407 (124)
136 (42) 349 (106)
119 (36) 305 (93)
106 (32) 271 (83)
95 (29) 244 (74)
87 (26) 222 (68)
80 (24) 204 (62)
73 (22) 188 (57)
68 (21) 174 (53)
64 (19) 163 (50)
60 (18) 153 (47)
56 (17) 144 (44)
53 (16) 136 (41)
50 (15) 129 (39)
48 (15) 122 (37)