Juniper EX9253 Hardware Manual page 98

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 each power supply.
3. Remove the nuts from the terminals. Save the nuts.
CAUTION: Ensure that each power cable lug seats flush against the surface of the
terminal block as you are tightening the nuts. Ensure that each nut is properly
threaded into the terminal. Applying installation torque to the nuts when
improperly threaded can result in damage to the terminal.
CAUTION: The maximum torque rating of the terminal screws on the DC power
supply is 6 lb-in. (0.68 Nm). The terminal screws might be damaged if excessive
torque is applied. Use only a torque-controlled driver to tighten screws on the DC
power supply terminals. Use an appropriately sized driver, with a maximum torque
capacity of 6 lb-in. (0.68 Nm) or less. Ensure that the driver is undamaged and
properly calibrated and that you have been trained in its use. You may want to use a
driver that is designed to prevent overtorque when the preset torque level is
achieved.
4. Secure each power cable lug to the terminal with the nuts by using a socket nut driver (see
31 on page 90). Do not overtighten the nuts. Apply between 5 lb-in. (0.6 Nm) and 6 lb-in.
(0.68 Nm) of torque to the nuts.
a. Secure the positive (+) DC source power cable lug to the return terminal (labeled RTN).
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Figure