5.
Ratings
5.1
Controller shall be rated as follows:
5.1.1 Interrupting Ratings:
400 Ampere Controller:
- contactor
7.0kA @ 6.9kV
- fused controller
50kA RMS Sym. @ 7.2kV
200MVA @ 2.3kV
350MVA @ 4.0kV
400MVA @ 4.6kV
570MVA @ 6.6kV
5.1.2 Continuous Thermal Ratings:
400 Ampere Controller:
Enclosure type
Max. Continuous
Amperes
46” and 61” One-high
controller
Max. Continuous
Amperes
90” One-high controller or
Lower controller in a Two-
high stacking
arrangement
Max. Continuous
Amperes
Upper controller in a
Two-high stacking
arrangement
NEMA-1 Ventilated
360
360
320
NEMA-1 Non-ventilated
320
320
280
NEMA-12/3R
310
310
280
5.1.3 Short Time Thermal Rating:
400 Ampere Contactor: 2400A for 30 seconds
6000A for 1 second
5.1.4 Impulse Withstand:
400 Ampere Controller: 60kV
1.2 x 50 microsecond wave
Rev. 2, 2/16/1999
