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accordance with the National Electrical Code in the US and the Canadian Electrical
Code in Canada.
■ Run two wires from the circuit breaker box to a source of 48 VDC. Use appropriate
gauge wire to handle up to 50 A.
■ Be sure to connect the ground wire or conduit to a solid office (earth) ground. A
closed loop ring is recommended for terminating the ground conductor at the
ground stud.
■ A DC-powered router that is equipped with a DC terminal block is intended only
for installation in a restricted access location. In the United States, a restricted
access area is one in accordance with Articles 110-16, 110-17, and 110-18 of
the National Electrical Code ANSI/NFPA 70.
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, the negative lead to the terminal labeled –48V,
and the earth ground to the chassis grounding points.
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.
150 ■ Safety Guidelines and Warnings
MX240 Ethernet Services Router Hardware Guide