T640 AC Power Electrical Safety Guidelines

• 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.
• For each three-phase delta AC power supply. you must provide an external listed customer site circuit breaker rated minimum 40 A (240 VAC) in the building installation, or as required by local code.
• For each three-phase wye AC power supply. you must provide an external listed customer site circuit breaker rated minimum 25 A (415 VAC) in the building installation, or as required by local code.
• The delta cores in the mains lead are labeled as follows:
  • Wire labeled GND—Earth
  • Wire labeled L1
  • Wire labeled L2
  • Wire labeled L3
• The wye cores in the mains lead are labeled as follows:
  • Wire labeled GND—Earth
  • Wire labeled L1
  • Wire labeled L2
  • Wire labeled L3
  • Wire labeled N

Caution: For Juniper systems with AC power supplies, an external surge protective device (SPD) must be used at the AC power source.