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Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter 3 Preparing for Installation
Site Requirements for a MGX 8830 or MGX 8830/B Switch
AC Power
AC power sources must be dedicated AC branch circuits. Each branch circuit must be protected by a
dedicated two-pole circuit breaker.
Tip Check the power at your site to ensure that you are receiving “clean” power (free of spikes and noise).
Install a power conditioner if necessary.
Caution Consult Cisco Customer Service if the plans for the system’s AC power include an uninterruptible power
source (UPS). It is recommended that you use a UPS with a low output impedance and the capacity to
provide the necessary fault current to trip the protection devices. If the UPS cannot provide the fault
current, the UPS must be equipped with a fault bypass switch that can trip the protection devices through
the utility power. Do not use a UPS or any power source with a Ferro-Resonant transformer.
Caution For mission-critical applications, it is recommended that you use the dual AC power input tray with dual
AC power cords, so that there can be no single or primary power failure.
The power receptacles to which the switch connects must be of the grounding type. The grounding
conductors that connect to the receptacles should connect to protective earth at the service equipment.
Figure 3-10 shows the hookup schematic in the three-wire wall plug. The figure is the same for 100 to
120 VAC.
For AC power cord details (part numbers and countries), see Table 3-21 on page 3-53.
Figure 3-10 Schematic of AC Plug Wiring
DC Power
DC power is supplied to the MGX 8830 or MGX 8830/B switch through one or two DC PEMs. Each DC
PEM must be connected to a dedicated 30-A regulated source. Each branch circuit must have a 30-A
circuit breaker at the source.
Wires connecting the PEMs to the sources should be capable of carrying 30 A. A 10AWG (4-square mm)
copper wire is recommended. Consult the local or national codes for conductor sizing for DC supply
connections if necessary.
Note For more information about the DC PEM, see the “DC Power Entry Module (PEM)” section on
page 1-54.
H8397
L2
L1
200 to 240 VAC