Appendix A: Safety and Regulatory Compliance Information

WARNING: The router is pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal (sized for UNC 1/4-20 ground lugs) provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earthing terminal must be permanently connected to earth.

The cores in the mains lead are colored in accordance with the following code:

Green and yellow—Earth

Blue—Neutral

Brown—Live

DC Power Electrical Safety Guidelines and Warnings

When working with DC-powered equipment, observe the following guidelines and warnings:

DC Power Electrical Safety Guidelines on page 149

Copper Conductors Warning on page 150

DC Power Disconnection Warning on page 151

DC Power Grounding Requirements and Warning on page 152

DC Power Wiring Sequence Warning on page 153

DC Power Wiring Terminations Warning on page 154

DC Power Electrical Safety Guidelines

The following electrical safety guidelines apply to a DC-powered router:

A DC-powered router is equipped with a DC terminal block that is rated for the power requirements of a maximally configured router. To supply sufficient power, terminate the DC input wiring on a facility DC source capable of supplying at least 31 A @ –48 VDC per input for each power supply.

Incorporate an easily accessible disconnect device into the facility wiring. We recommend that the 48 VDC facility DC source should be equipped with a circuit breaker rated at 40 A (–48 VDC) minimum, or as required by local code. In the United States and Canada, the 48 VDC facility should be equipped with a circuit breaker rated a minimum of 125% of the power provisioned for the input in

Safety Guidelines and Warnings 149

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Juniper Networks MX240 manual DC Power Electrical Safety Guidelines and Warnings