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
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.
