Power And Grounding - Cisco BPX 8620 Installation And Configuration Manual

Chapter 7 Preliminary Steps Before Installing
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Power and Grounding

To access power and grounding requirements, use the following procedure:
In order for the BPX switch to function safely and correctly, along with peripheral equipment, use only
Step 1
the power cords, cables, and connectors specified for the attached peripheral equipment, and make sure
they are in good condition.
Certain BPX switches are supplied with two power feeds (cords). Before commencing installation or
Step 2
maintenance inside the cabinet, be sure both power feeds are disconnected from their respective sources.
Ensure that the BPX switch frame is attached to an isolated ground connection (connection attached
Step 3
directly to ground through an uninterrupted line).
A conduit hookup box is factory-installed on each DC Power Entry Module for sites requiring wiring to
Step 4
be enclosed in conduit. A plastic terminal block cover is also provided for installations that do not
require conduit hookup. Install one or the other as protection for the DC input.
For an AC system, verify that the node is powered from a dedicated AC branch circuit. The circuit shall
Step 5
be protected by a dedicated 2-pole circuit breaker sized such that the rated current and the trip delay is
higher and longer than the BPX switch circuit breaker. A dedicated 20A, 2-pole AC circuit breaker with
a long trip delay is recommended for installation.
Note
For a DC system, verify that the node is powered from a dedicated DC branch circuit. The circuit shall
Step 6
be protected by a dedicated circuit breaker sized such that the rated current and the trip delay is higher
and longer than the BPX switch circuit breaker. A dedicated 50A, 1-pole DC circuit breaker with a long
trip delay is recommended for installation.
Note
An insulated grounding conductor should be installed as part of the branch circuit that supplies the unit.
Step 7
This grounding conductor is identical in size to the grounded and ungrounded branch circuit supply
conductors, but is green with yellow stripes.
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Wear safety glasses if you are working under any conditions that might be hazardous to your eyes.
Never attempt to lift an object that might be too heavy for you to lift alone.
Always power OFF all power supplies and unplug all power cables before opening, installing, or
removing a chassis.
The BPX switch uses a 15A (or in newer models a 20-A), 2-pole AC circuit breaker with a
medium trip delay on each AC input. The circuit breaker manufacture is either Carlingswitch
(p/n CA2-B0-34-615-121-C) or Heinemann (part number AM2-A3-A-0015-02E).
The BPX switch uses a 50A, 1-pole DC circuit breaker with medium trip delay on the -48V
input. The circuit breaker manufacture is Heinemann (part number
AM1S-B3-A-0050-02-H).
Cisco BPX 8600 Series Installation and Configuration
Safety Requirements
7-5