Juniper Networks M160 manual Shows a typical source cabling arrangement

M160 Internet Router Hardware Guide

breaker box. You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–)to indicate their polarity.

Figure 29 shows a typical source cabling arrangement.

Figure 29: Typical Source Cabling to the Router

Chassis grounding points

Central office primary & secondary DC power distribution

Rectifiers

AC

Ground window

Batteries

Plant

controls

Central

office ground

Central

office ground

Battery plant

1975

WARNING: Power plant ground and chassis ground must be connected to the same building ground.

Table 17 summarizes the specifications for the grounding and power cables, which you supply. The accessory box shipped with the router includes the cable lugs that attach to the terminal studs of the circuit breaker box (see Figure 28). (The cable lug shown in Figure 28 is also used for the grounding the chassis.)

CAUTION: Before router installation begins, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the router (for example, by causing a short circuit).

68 Power Guidelines, Requirements, and Specifications