Juniper Networks M160 manual Preparing for Router Installation

Preparing for Router Installation

Table 17: DC Power and Grounding Cable Specifications

		Maximum
Cable Type	Quantity and Specification	Equal Length
Power	Eight 4-AWG (16 mm2) wires, minimum, or as permitted	None
	by the local code
Grounding	One 8-AWG (8.4 mm2) wire, minimum, or as permitted	None
	by the local code

WARNING: For field-wiring connections, use copper conductors only.

For other electrical safety information, see “Electrical Safety Guidelines and

Warnings” on page 227.

CAUTION: Power cords and cables must not block access to router components or drape where people could trip on them.

Figure 30 shows how to attach the power cables. The power cables attach to the 1/4–20 UNC terminal studs located on the circuit breaker box— the input set of studs is labeled –48Vand the return set is labeled RTN(+). The nuts and locking washers used to secure the power cable lugs on the terminal studs are preinstalled on the studs.

The tool for loosening or tightening the nuts on the terminal studs is a 7/16-in. hexagonal-head external drive socket wrench, or nut driver, with a minimum of 30 lb-in. (3.5 Nm) tightening torque.

CAUTION: Do not substitute a metric nut driver or wrench. A tool that does not fit the nuts exactly can damage them. If a 7/16-in. tool is not available, use pliers or an adjustable wrench.

Power Guidelines, Requirements, and Specifications 69