Chapter 11: Connecting the Switch
■Phillips (+) screwdriver, number 2
Before you begin connecting DC power to an EX3200 or EX4200 switch:
■Ensure that you have taken the necessary precautions to prevent ESD damage (see “Prevention of Electrostatic Discharge Damage on EX Series Switches” on page 236).
■Ensure that you have connected the switch chassis to earth ground.
CAUTION: Before you connect power to the switch, 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 switch (for example, by causing a short circuit).
To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect EX3200 and EX4200 switches to earth ground before you connect them to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the switch chassis to connect to the earth ground. For instructions on connecting earth ground, see “Connecting Earth Ground to an EX Series Switch” on page 141.
■Install the power supply in the chassis. For instructions on installing a power supply in an EX3200 or EX4200 switch, see “Installing a Power Supply in an EX3200 or EX4200 Switch” on page 130.
To connect DC power to an EX3200 or EX4200 switch:
1.Ensure that the power supplies are fully inserted in the chassis and the screws on their faceplates are tightened.
2.Ensure that the input circuit breaker is open so that the voltage across the DC power source cable leads is 0 V and that the cable leads will not become active while you are connecting DC power.
NOTE: The DC power supply in EX3200 and EX4200 switches has four terminals labeled A+, B+,
NOTE: The A+ and B+ terminals are referred to as +RTN and A– and B– terminals are referred to as
