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The following electrical safety guidelines apply to an AC-powered MX2020 router with three-phase AC power distribution modules:

AC-powered routers are shipped with three-phase electrical cords with grounding. Do not circumvent this safety feature. Equipment grounding must comply with local and national electrical codes.
The delta cores in the terminal block are labeled as follows:
- Terminal block labeled GND—Earth
- Terminal block labeled A1
- Terminal block labeled B1
- Terminal block labeled C1
- Terminal block labeled GND—Earth
- Terminal block labeled A2
- Terminal block labeled B2
- Terminal block labeled C2
The wye cores in the terminal block are labeled as follows:
- Terminal block labeled GND—Earth
- Terminal block labeled A1
- Terminal block labeled B1
- Terminal block labeled C1
- Terminal block labeled N1
- Terminal block labeled GND—Earth
- Terminal block labeled A2
- Terminal block labeled B2
- Terminal block labeled C2
- Terminal block labeled N2