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2. Install the latch.
3. Align the lower hinge pin on the front door with the hinge. Partially insert the pin into the hinge.
4. Align the upper hinge pin with the hinge. Lower the door into position.
5. Adjust the latch so that the door is latched securely.
Step 8. Check the customer's ac power source
Before you plug the power cord into the ac power source, perform the following checks on the customer's
ac power source.
DANGER
CAUTION:
Ensure the building power circuit breakers are turned off BEFORE you connect the power
cord(s) to the building power. (C023)
1. Have the customer turn off the branch circuit breaker for the ac power outlet into which the power
cord will plug. Attach a "Do Not Operate" tag (S229–0237) to the circuit breaker switch.
Note: All measurements are made with the receptacle face plate in the normal installed position.
2. Some receptacles are enclosed in metal housings. For this type of receptacle, perform the following
steps:
a. Check for less than 1 volt from the receptacle case to any grounded metal structure, such as a
raised-floor metal structure, water pipe, building steel, or similar structure.
b. Check for less than 1 volt from the receptacle ground pin to a grounded point in the building.
Note: If the receptacle case or face plate is painted, be sure that the probe tip penetrates the paint
and makes good electrical contact with the metal.
c. Check the resistance from the ground pin of the receptacle to the receptacle case. Check the
resistance from the ground pin to the building ground. The readings should be less than 0.1 ohm,
which indicates the presence of a continuous grounding conductor.
3. If any of the three checks that you made in step 2 are not correct, ask the customer to:
v Remove the power from the branch circuit.
v Make the wiring corrections.
Recheck the receptacle.
Note: Do not use a digital multimeter to measure grounding resistance in the following steps.
4. Check for infinite resistance between the ground pin of the receptacle and each of the phase pins. This
check is for a wiring short to ground or a wiring reversal.
5. Check for infinite resistance between the phase pins. This check is for a wiring short.
If the receptacle has a metal shell, do not touch the shell until you have completed the
voltage and grounding checks. Improper wiring or grounding could place dangerous
voltage on the metal shell. If any of the conditions are not as described, STOP. Ensure
the improper voltage or impedance conditions are corrected before proceeding. (D003)
215
Appendix A. SAN rack
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