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Equipment needed: Digital voltmeter with 1000V AC or 1000V
DC rated input minimum, 10M Ω input impedance and CAT III &
IV. A pair of insulated test probes with .080" DIA. points.
Directions: Before and after each test, determine the voltmeter
is operating satisfactorily through verification of known AC & DC
voltage sources. With the meter switched to VAC and test leads in
ACV meter jacks, a qualified person can insert probe points into
any two of the (4) terminal posts {L1, L2, L3, GND}, or (3) terminal
posts {L1, N, GND}.
1. To validate normal powered conditions, AC voltage is observed
for all six (6) post pair combination circuits {L1-L2, L1-L3, L2-L3,
L1-GND, L2-GND, L3-GND} (R-3MT-VI), and for all (3) post pair
combination circuits {L1-N, L1-GND, N-GND}
(R-3MT-VI-AC3).
2. To check for zero electrical energy during shut off, verify
sources of feedback or stored energy are first neutralized.
With the meter and leads setup for VAC measurement, verify
the post pair combination circuits in step 1 are de-energized.
Change voltmeter and test leads for VDC measurement. Again
verify the post pair combination circuits are also de-energized
for VDC (stored energy).
3. Ensure your facility personnel are properly trained with the use
and limitations of these devices and properly update the "Point
of Connections" on your installation drawings.
OPERATION INSTRUCTIONS
Ensure power is disconnected before starting any
work on electrical systems. Adhere strictly to local
installation codes and follow established safety and lockout/tagout
procedures. Confirm zero electrical energy with the appropriate testing
instrument to maintain a safe working environment.
MAINTENANCE
With power removed, free dust and particles from the front of the
label and dust cap with compressed air. Open the dust cap by
unscrewing the cap screw and free the dust and particles on the
inside of the cap and jack sockets with compressed air. Maintain a
clean label by gently wiping with a clean damp cloth while power
is removed. Cleaning while powered is not recommended.
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