Cisco Systems MGX 8230 Power and Grounding, AC Power Circuit Breakers, DC Power Circuit Breakers

Chapter 3 Site Preparation

Power and Grounding

Power and Grounding

This section describes the requirements for electrical power and grounding the switch and the site. These requirements apply to Central Office (CO) and Private Enterprise (PE) sites.

AC Power Circuit Breakers

AC power must come from dedicated, AC branch circuits. Each circuit must be protected by a dedicated, two-pole circuit breaker. The circuit breakers at the source must have a rated current and trip delay greater than those of the MGX 8230 circuit breaker. Cisco recommends that the site have a 20A, 2-pole AC circuit breaker with a long trip delay at each branch circuit.

The MGX 8230 uses a 20A, 2-pole circuit breaker for each AC input. The manufacturer of this circuit breaker is ETA. The ETA part number is 8340-F120-P1P2-B2H020A.

DC Power Circuit Breakers

For a DC-powered MGX 8230, verify that its power comes from a dedicated DC branch circuit. This branch circuit must be protected by a dedicated circuit breaker. Cisco Systems recommends the site have a dedicated 30 Amp circuit breaker with a medium trip delay at each branch circuit.

A DC-powered MGX 8230 uses a single pole 30 Amp circuit breaker with a short trip delay on each –48V input. The circuit breaker manufacturer is ETA. The part number is ETA 8340-F110-PIKI-A2H030A.

Electrical Power for AC-Powered Nodes

The MGX 8230 AC power requirement is a voltage range of 100 to 120 or 200 to 240 VAC. A worst-case 90 VAC is allowed. Refer to Appendix A, “Technical Specifications.” An AC power source must be available within 6 feet (1.8 m) of the system and easily accessible. Before turning on the power, verify that each power source to the MGX 8230 comes from a dedicated branch circuit.

The power receptacles to which the node connects must be of the grounding type. The grounding conductors that connect to the receptacles should connect to protective earth at the service equipment.

Cisco can provide AC power cords with the following plugs:

•20 A NEMA Lb-20P, twist lock plug (domestic U.S.)

•13 A 250 Vac BS1363, 3-prong fused plug (UK, Ireland)

•CEE 7/7 (Continental Europe)

•AS3112 (Australia/New Zealand)

•CEI23-16/VII (Italy)

•NEMA5-15P 125V/15 A 3-prong plug, grounding type (North America)

Electrical Power for a DC-Powered MGX 8230

Only a - 48 VDC supply that complies with the Safety Extra Low Voltage (SELV) requirements of EN 60950 can connect to the DC input.

	Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001		3-17