AT&T 555-230-894 Lay Out and Ensure Appropriate Grounding, Connect Coupled Bonding Conductor

Plan and Prepare the Site

Parameter	Requirements
Electrical	Voice band noise from the battery plant to the system must
Noise	be less than 32 dBrnC (decibels above reference noise with
	C-filter or -58 dBmp (decibels below 1 milliwatt
	psophometric).
Grounding	A single point ground must be maintained. A ground
	conductor must be installed from the battery plant GROUND
	DISCHARGE BAR to the closest “Approved Ground” via the
	shortest and most direct route as required by the National
	Electrical Code or applicable electrical code in your area.
	The gauge must be no smaller than the largest conductor in
	the System and larger than 6 AWG. Grounding between the
	system cabinet and the battery plant should be connected
	using the procedures given later in this chapter.
Lightning	There must be adequate lightning protection in the battery
Protection	plant to insure that the system will not be damaged.

Lay Out and Ensure Appropriate

Grounding

Grounding is relatively simple for an AC-powered switch. First, connect the cabinets to each other. Then, connect a single ground wire from the Processor Port Network (PPN) to the approved protective ground.

Grounding of the system must comply with the general rules for grounding contained in Article 250 of the National Electrical Code (NEC), National Fire Protection Agency (NFPA) 70, or the applicable electric code in your country. See Appendix A for a description of “approved ground.”

Connect Coupled Bonding Conductor

The Coupled Bonding Conductor connects to the single-point-ground-block and runs adjacent to pairs in an associated telecommunications cable. The mutual coupling between the bonding conductor and the pairs reduces potential differences in terminating equipment. The conductor consists of a 10 AWG wire that must be tie-wrapped to the inside wiring cable and terminated at the coupled bonding conductor terminal bar at the switch cross-connect field.

Refer to Appendix F for wire conversion information.

Refer to Figure 4-9 on page 4-13for an illustration of a Coupled Bonding Conductor.

If the approved protective ground or approved floor ground can only be accessed inside a dedicated power equipment room, you should have an electrician make the connections to this ground.

2-8Issue 1 September 1995