
INSTALLATION
AC Power
All cabinets and any
A
Local options may require that surge protectors be used for all peripheral equipment used with the System 25, including the Customer Service Unit
(CSU).
Grounding
For proper grounding instructions, refer to the AT&T System 25 Electrical
Protection and Exposure Check List
Warning: Verify that the building ground has been provided by one of the methods listed below, that ac power uses approved building ground for its primary ground, and that all voltage limiting devices are grounded to building approved ground. Improper ground can result in equipment failures and service outages from lightning induced surges on the power lines.
An approved building ground for System 25 may be one of the following, listed in decreasing order of preference:
1.Building steel.
2.Acceptable water pipe— a metal underground water pipe at least 1/2 inch in diameter, in direct contact with the earth for at least 10 feet. The pipe must be electrically continuous (or made electrically continuous by bonding around insulated joints, plastic pipe, or plastic water meters) to the point where the protector ground is connected.
A metallic underground water pipe must be supplemented by the