Juniper EX9214 Hardware Manual page 55

you install a power supply of the other type while the switch is operating with one type
of power supply, the switch disables the power supply you installed and generates an
alarm.
This topic describes the AC power supplies in EX9214 switches.
AC Power Supply Description
The AC power supplies in EX9214 switches are hot-insertable and hot-removable field-replaceable units
(FRUs).
You can install either two or four AC power supplies in an EX9214 switch. Power supplies are installed
at the rear of the chassis in slots PEM0 through PEM3 (left to right). Four power supplies provide full
redundancy.
WARNING: The switch is installed in a restricted-access location. It has a separate
protective earthing terminal (sized for UNC 1/4-20 ground lugs) provided on the chassis
in addition to the grounding pin of the power supply cord. This separate protective
earthing terminal must be permanently connected to earth.
CAUTION: Before switch installation begins, ensure that a licensed electrician has
attached an appropriate grounding lug to the grounding cable that you supply. Using a
grounding cable with an incorrectly attached lug can damage the switch.
44