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SECTION 6
Maintenance
There are no wear items in the MBS that require periodic replacement. However, regular
care will assure maximum availability of power.
Keep the ventilation openings in the cabinet free of dust and debris.
Wipe the cabinet exterior with a soft cloth, slightly dampened with water, to remove dust.
Consider performing periodic infrared temperature measurements on the circuit breaker
terminations. This will require access to the cabinet interior. There are hazardous voltages
present and any work must be performed using caution. Only trained service personnel
should perform this work. Elevated temperatures of the terminations usually are the sign of
a loose connection, but can also signal that a breaker is failing. Loose connections should
only be serviced after removal of power.
If the system is powered down, consider removing accumulated dust from the cabinet
interior using a vacuum cleaner.
SECTION 7
FirstLine P Maintenance Bypass Switch Technical Specifications
Table 9 - Technical Specifications
Environmental
Altitude
De-rate load capability above 1000 meters 1% per 100
meters.
Operating Temperature
40
o
C Maximum
Humidity
Maximum 95%RH, Non-condensing
Electrical
160 kVA
200 kVA
250 kVA
Rated voltage
480/277
480/277
480/277
Rated Current
212A
265A
331A
Breaker Rating
300A
350A
450A
Minimum Wire Size INPUT
500 kcmil or
(2) 2/0 AWG
(2) 3/0 AWG
(2) 300 kcmil
OUTPUT
300 kcmil
500 kcmil or
(2) 2/0 AWG
(2) 4/0 AWG
Heat Rejection – Less than (BTU/Hr)
800
1000
1250
