Installing Power Modules
7450 ESS-7 Page 65
Notes:
• The DC power source should be located in the same building as the equipment.
• Each DC-input PEM requires a dedicated 60A service.
• Cables are not provided. In the United States, use #6 AWG, high strand count copper wire. If the
7450 ESS-7 router is located outside the USA, consult local and national electrical code for proper
wire sizing.
• For the DC PEM terminal block lug, use a lug such as a Panduit LCC6-10A-L copper, standard
barrel, 2-hole lug with two .200-inch (
.508 cm) diameter holes on a .625-inch (1.6 cm) spacing.
• Overtightening the lugs can lead to PEM damage and subsequent electrical failure.
• The 7450 ESS-7 requires a minimum of one DC PEM to operate, but two are recommended for
redundancy. When two PEMs are installed, they share the electrical load as long as both PEMs are
operational. If one PEM fails, the remaining PEM provides the power the router requires for
normal operation.
• For full redundancy, each power entry module should be attached to an independent power source
with a dedicated circuit breaker.
• The DC PEMs are designed to be installed in the right or left rear power slot, although they are
interchangeable. The terminal block on the left DC PEM should be oriented on the left side of the
faceplate so the power cables are directed to the left of the chassis. The terminal block on the right
DC PEM must be oriented on the right side of the faceplate so the power cables are directed to the
right of the chassis. See Figure 16.
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