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4 WHITE PAPER – VeriSafe Absence of Voltage Tester–Improving Eciency and Reducing Costs
Figure 1. Absence of voltage test using a
hand-held voltage test instrument.
Limitations of Using a Hand-held Tester
Verifying the absence of voltage is part of the process to establish an
electrically safe work condition. Step 5 of NFPA 70E-2015 Article 120.5
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describes this process:
Use an adequately rated test instrument to test each phase conductor
or circuit part to verify it is de-energized. Test each phase conductor or
circuit part both phase-to-phase and phase-to-ground. Before and after
each test, determine that the test instrument is operating satisfactorily
through verification on a known voltage source.
This process usually involves a portable, hand-held voltage test
instrument. To be eective, it is critical to perform each step of the
process in sequence, and it requires taking the necessary precautions,
such as the proper use of personal protective equipment (PPE) (Figure 1).
Complexity
Adhering to this process prevents electrical injuries, but the process is
complex and time consuming. Portable instruments are susceptible to
mechanical and electrical failure and misuse by the person using the
device. In addition, because the process of using a hand-held tester is
dependent on human input, interaction, and interpretation, it is vulnerable
to mistakes and errors.
Training Costs
Training on the selection, maintenance, and use of test instruments
is crucial as are systems for inspecting and maintaining voltage test
instruments. However, training and maintaining the test equipment
incur the additional expenses of time and cost.
11.7%18.3% 36.7%
Reported near misses
of personal injury
Facilities experienced
interruptions to plant
operations due to
voltage testing incidents
Facilities experienced a
personal injury when
using hand-held voltage
test instruments
Safety Is In Your Hands:
The Risks of Voltage
Testing
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