Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Guide That Contains This Content
[+] Expand All
[-] Collapse All

    M40e DC Power, Connection, and Cable Specifications

    To supply power to the router, connect power cables to a separate, dedicated DC power source for each power supply and attach the cables to the terminal studs on the circuit breaker box.

    The accessory box shipped with the router includes the cable lugs that attach to the terminal studs of the circuit breaker box. (The cable lug shown in M40e Chassis Grounding Specifications is also used for the grounding the chassis.)

    Caution: Before router installation begins, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the router.

    Table 1 summarizes the specifications for the power cables, which you must supply.

    Table 1: Power Cable Specifications

    Cable Type

    Quantity and Specification

    Connector Specification


    Eight 4-AWG (21.2 mm2 ) (minimum) copper conductor, or as permitted by the local code.

    Cable lug; dual hole, sized to fit 1/4-20 UNC terminal studs at 15.86-mm (0.625-in.) center line.


    Caution: You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on the circuit breaker box.

    Warning: For field-wiring connections, use copper conductors only.

    For other electrical safety information, see General Electrical Safety Guidelines and Warnings Electrical Codes for M Series, MX Series, and T Series Routers.

    Caution: Power cords and cables must not block access to router components or drape where people could trip on them.

    M40e DC Power Distribution shows how to attach the power cables. The power cables attach to the 1/4–20 UNC terminal studs located on the circuit breaker box— the input set of studs is labeled –48V and the return set is labeled RTN(+). The nuts and locking washers used to secure the power cable lugs on the terminal studs are preinstalled on the studs.

    The tool for loosening or tightening the nuts on the terminal studs is a 7/16-in. hexagonal-head external drive socket wrench, or nut driver, with a torque range between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm).

    Published: 2010-10-28