Cut Sheet

8
Technical Data TD01701001E
Effective March 2017
UL low-voltage busway
Pow-R-Way III
EATON www.eaton.com
Electrical data
Table 6. Short-circuit rating
UL 857
ampere rating
6-cycle rms symmetrical
short-circuit rating
Maximum Class L fuse
needed to achieve 6-cycle
rms series rating
Plug-in Feeder 100 kA 200 kA
Aluminum
225 85,000 85,000 2000 1200
400 85,000 85,000 2000 1200
600 85,000 85,000 2000 1200
800 100,000 100,000 — 2500
1000 100,000 100,000 — 2500
1200 125,000 125,000 — 2500
1350 150,000 150,000 — 4000
1600 150,000 150,000 — 4000
2000 150,000 150,000 — 4000
2500 200,000 200,000 — —
3200 200,000 200,000 — —
4000 200,000 200,000 — —
Copper
225 85,000 85,000 2000 1600
400 85,000 85,000 2000 1600
600 85,000 85,000 2000 1600
800 85,000 85,000 2000 1600
1000 100,000 100,000 — 3000
1200 100,000 100,000 — 3000
1350 100,000 100,000 — 3000
1600 125,000 125,000 — 3000
2000 150,000 150,000 — 4000
2500 150,000 150,000 — 4000
3200 200,000 200,000 — —
4000 200,000 200,000 — —
5000 200,000 200,000 — —
Table 7. Resistance, reactance, and impedance—aluminum
Milliohms per 100 ft (30.5 m) line-to-neutral aluminum plug-in
and feeder busway
UL 857
ampere rating Resistance R Reactance X Impedance Z
225 4.38 1.17 4.54
400 4.38 1.17 4.54
600 4.38 1.17 4.54
800 2.67 0.99 2.84
1000 2.29 0.84 2.44
1200 1.76 0.64 1.87
1350 1.39 0.49 1.47
1600 1.25 0.43 1.32
2000 1.01 0.34 1.07
2500 0.71 0.27 0.76
3200 0.62 0.24 0.67
4000 0.50 0.19 0.54
Table 8. Resistance, reactance, and impedance—copper
Milliohms per 100 ft (30.5 m) line-to-neutral copper plug-in
and feeder busway
UL 857
ampere rating Resistance R Reactance X Impedance Z
225 2.30 1.20 2.59
400 2.30 1.20 2.59
600 2.30 1.20 2.59
800 2.30 1.20 2.59
1000 1.67 0.95 1.93
1200 1.39 0.78 1.60
1350 1.20 0.66 1.37
1600 0.94 0.50 1.07
2000 0.76 0.39 0.85
2500 0.55 0.26 0.61
3200 0.47 0.31 0.57
4000 0.38 0.24 0.45
5000 0.27 0.16 0.32
Table 9. Resistance values for integral housing ground (only)
milliohms per 100 ft (30.5 m)
UL 857
ampere rating
Aluminum phase
conductors
Copper phase
conductors
225 1.04 1.04
400 1.04 1.04
600 1.04 1.04
800 0.95 1.04
1000 0.92 0.99
1200 0.85 0.95
1350 0.72 0.92
1600 0.68 0.85
2000 0.61 0.72
2500 0.36 0.61
3200 0.34 0.43
4000 0.30 0.36
Derating table for higher ambient temperatures
Pow-R-Way III busway may be operated continuously at its assigned
ratings without exceeding the maximum hot spot temperature rise
of 55 °C, provided the ambient temperature does not exceed 40 °C.
For higher ambient temperatures, the ratings should be reduced by
applying the appropriate multiplier shown in the following table.
Table 10. Higher ambient temperature multipliers
Ambient temperature Multiplier
40 °C (104 °F) 1.00
45 °C (113 °F) 0.95
50 °C (122 °F) 0.90
55 °C (131 °F) 0.85
60 °C (140 °F) 0.80
65 °C (149 °F) 0.74
70 °C (158 °F) 0.67