Cisco PWR-3KW-DC-CBL= power cable Black

All power connection wiring should conform to the rules and regulations prescribed by the National Electrical Code (NEC), as well as local codes, if any.

The DC return must remain isolated from the system frame and the chassis (DC-I).

The color coding of the source DC power cable leads depends on the color coding of the site DC power source. Typically, green or green and yellow stripes indicate that the cable is a ground cable. Since there is no color code standard for source DC wiring, you must ensure that the power cables are connected to the DC-input power supply terminal block in the proper + and - polarity.

In some cases, the source DC cable leads might have a positive (+) or a negative (–) label. This label is a relatively safe indication of polarity, but you must verify the polarity by measuring the voltage between the DC cable leads. When measuring, ensure that the positive lead and the negative lead always match the "+" and "-" labels on the DC-input power supply terminal block, respectively.

DC power cables use the M-CRPS connector at the power supply end.

The circuit must be protected by a dedicated two-pole DC-rated circuit breaker.

The circuit breaker is considered to be the disconnect device and must be easily accessible. For DC-input power supply units with multiple inputs, each DC input must be protected by a dedicated DC-rated circuit breaker or a fuse.

The circuit breaker or fuse should be sized according to the power supply input rating and local or national code requirements.

If the DC inputs are powered from separate sources, the cables must be wired straight across to their respective sources and terminals.