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CO LINE PROTECTOR
SURGE
PROTECTORS
The following test can be used to check CO line protector
grounding. This test does
not
check the bond between the
power company and telephone company protector
grounds.
1 Connect a craft test set between the protector ground
lug and the ring side of the CO line.
2 If a dial tone is present, the protector is grounded.
3 If a dial tone is not present, the protector is not
grounded; call the local telephone company. Request
that they properly-ground and bond the CO line
protector to ac power ground.
If the CO line protector is properly grounded and bonded
to the ac power ground, most lightning damage will be
prevented.
Both the ac line and CO line parts of the 147A Protector
are available as separate units. The ac line component is
available as the 145A AC Surge Protector. For installation
instructions, refer to CIB 3110, which is included with the
component. The central office line component is available
as the 146A CO Line Protector. Installation instructions
for the 146A CO Line Protector are available in CIB 3111,
which is included with the device.
A 147A Protector provides additional protection from ac
and CO line power surges. If the line module’s apparatus
code contains the letter “A” (517A1, 517A2, or 517A4),
use the 147A Protector for surge protection. If the line
module’s apparatus code contains the letter “B” (517B1,
517B2, or 51734), use a 145A Protector. Modules with
the “B” designation have CO line protection built in, but
not ac line protection.
For installation and user instructions, refer to Customer
Instruction Booklet (CIB) 3109, which is included with
the 147A Protector.
2-8 System Grounding Requirements