DEFINITY ECS Release 6
System Description Pocket Reference
555-230-211
Issue 2
January 1998
Page 30
Power and Grounding
Additional Power Surge Protection
The 391A1 power supply has built-in AC line protection. This built-
in protection handles almost all situations.
Occasionally, additional protection may be needed if the customer
is located in a heavy lightning area. A 147A surge protector can be
connected to the system to limit surges from the AC lines and
outside lines. One 147A protector provides protection for four
outside lines. Up to three 146A protectors can be added to the
147A to provide protection for a maximum of 16 outside lines. For
more than 16 lines, additional 147A protectors are required.
NOTE:
The 147A protector is usually not needed with the 391A1
power supply. It may be needed with the older 391A power
supply module in heavy lightning areas.
Complete installation instructions are provided with the protectors.