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User and Installation Manual
Compact MPA
5.5 POWER
The operating power is 115/230 VAC as primary, and 24VDC, alternatively 115/230 VAC as secondary. The Compact MPA
system will automatically switch between primary and secondary power sources in case of power supply failure. A secondary
power supply must be present at transition to emergency power supply in order to avoid the system boot sequence of
approximately 30 seconds. The system is unavailable for operation during the boot sequence.
As an optional safety precaution, the mains operating power may be pre-switched by means of a mechanical contactor/
switch-over module as long as the secondary supply is present to keep the system from power fail during the switching
period.
5.6 GLANDS
The cables enter the central and weatherproof units by means of cable glands. Where cable glands are not supplied from
the factory, the installer must fit glands sized appropriately to the actual cable outer diameter to obtain the specified ingress
protection.
The installer may drill holes as needed for cable glands in the removable gland plate which is mounted as standard in
Compact Cabinet. Ensure that holes are within cross-hatched area on illustration above.
5.7 FERRULING
The conductors should be ferruled prior to termination onto the screw terminals.
5.8 MARKING
• Each cable is to be marked with cable numbers.
• Each conductor is to be marked with the specific termination numbers.