Lucent Technologies Lineage
®
2000 ECS Battery Plant H569-416
3 - 14 Engineering, Planning & Ordering
Issue 2 August 1996
maximum allowable operating temperature for each wiring
method. For instance, for the maximum temperature for Type
RHW wire is 75°C (167°F). The current that will result in that
temperature (i.e., the ampacity) is less when the ambient air
temperature is higher and also when conductors are bundled or
side-by-side.
Overcurrent
Protection
The rating of an overcurrent protection device (fuse or circuit
breaker) should not exceed the AMPACITY of the conductor it
is intended to protect. The absolute maximum rating permitted
by the NEC for an overcurrent protector is the next larger
standard rating above the ampacity. Overcurrent protectors may
be sized smaller than this maximum rating. In general, however,
protectors should be rated as high as allowable to avoid nuisance
tripping due to high load conditions or inrush during start-up.
Lineage
®
2000
Engineering
Specifics
The methods used in the paragraph, “General Engineering
Calculations,” are appropriate for the engineering of any battery
plant. The specifications documented in the paragraph, “General
Engineering Calculations,” are used in this paragraph to select
the specific types and quantities of equipment available with the
Lineage
®
2000 ECS battery plant.
The following topics are covered in this paragraph:
•
rectifier sizing
•
battery sizing
•
number of bays
•
cable and load breaker sizing
•
low-voltage disconnect/reconnect
•
emergency shutdown/disconnect
•
controller options
•
alarm system interface
•
earthquake bracing
•
appearance packages