ISO/IEC TS 29125:2017/AMD2:2024/COR1:2025

ISO/IEC TS 29125
Edition 1.0  2017-04
Information technology - Telecommunications cabling requirements
for remote powering of terminal equipment

AMENDMENT 2
CO RRI G E NDUM 1
6.4.4 Reducing temperature increase
Replace Table 9, Figure 4, Table 10, Figure 6, Table 11 and Figure 7 with the following new
Table 9, Figure 4, Table 10, Figure 6, Table 11 and Figure 7.

ISO/IEC TS 29125:2017-04/AMD2:2024-10/COR1:2025-12(en)

Table 9 – Temperature rise for a 0,57 mm conductor diameter
1-pair cable versus current for different bundle sizes in conduit
Bundle Current
size
mA
200 400 600 800 1 000 1 200 1 400 1 600 1 800 2 000
∆T
K
7 0,2 0,6 1,4 2,4 3,8 5,4 7,4 9,6 12,2 15,0
19 0,3 1,0 2,3 4,1 6,4 9,3 12,5 16,3 20,7 25,5
37 0,4 1,5 3,3 5,9 9,2 13,2 18,0 23,5 29,7 36,7
61 0,5 1,9 4,4 7,8 12,1 17,5 23,8 31,0 39,3 48,5
91 0,6 2,4 5,5 9,8 15,2 22,0 29,9 39,0 49,4 61,0
Temperature rise above 10 K shown in grey background is not recommended for cables installed in an environment
that can reach 50 °C.
The values in this table are based on the DC resistance of the cable conductors. Manufacturers' and/or suppliers'
specifications give information relating to a specific cable.
NOTE The temperature rise for a particular cable is also dependent on the cable construction.

Figure 4 – Temperature rise for a 0,57 mm conductor diameter
1-pair cable versus current for different bundle sizes in conduit

Table 10 – Temperature rise for a 1,02 mm conductor diameter
1-pair cable versus current for different bundle sizes in air
Bundle Current
size
mA
200 400 600 800 1 000 1 200 1 400 1 600 1 800 2 000
∆T
K
7 0,0 0,1 0,3 0,5 0,8 1,2 1,6 2,1 2,6 3,2
19 0,1 0,2 0,5 0,9 1,4 2,0 2,8 3,6 4,6 5,6
37 0,1 0,3 0,7 1,3 2,
...