Juniper MX240 Hardware Manual page 273

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Copyright © 2013, Juniper Networks, Inc.
Appendix A: Safety and Regulatory Compliance Information for the MX240 Router
NOTE: Primary overcurrent protection is provided by the building circuit
breaker. This breaker should protect against excess currents, short circuits,
and earth faults in accordance with NEC ANSI/NFPA70.
Ensure that the polarity of the DC input wiring is correct. Under certain conditions,
connections with reversed polarity might trip the primary circuit breaker or damage
the equipment.
For personal safety, connect the green and yellow wire to safety (earth) ground at both
the router and the supply side of the DC wiring.
The marked input voltage of –48 VDC for a DC-powered router is the nominal voltage
associated with the battery circuit, and any higher voltages are only to be associated
with float voltages for the charging function.
Because the router is a positive ground system, you must connect the positive lead to
the terminal labeled
RTN
ground to the chassis grounding points.
DC Power Electrical Safety Warnings for Juniper Networks Devices on page 249
DC Power Electrical Safety Warnings for Juniper Networks Devices
When working with DC-powered equipment, observe the following warnings:
DC Power Copper Conductors Warning on page 249
DC Power Disconnection Warning on page 250
DC Power Wiring Terminations Warning on page 251
DC Power Copper Conductors Warning
WARNING: Use copper conductors only.
Waarschuwing Gebruik alleen koperen geleiders.
Varoitus Käytä vain kuparijohtimia.
Attention Utilisez uniquement des conducteurs en cuivre.
Warnung Verwenden Sie ausschließlich Kupferleiter.
Avvertenza Usate unicamente dei conduttori di rame.
Advarsel Bruk bare kobberledninger.
Aviso Utilize apenas fios condutores de cobre.
¡Atención! Emplee sólo conductores de cobre.
Varning! Använd endast ledare av koppar.
, the negative lead to the terminal labeled , and the earth
–48V
249