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Colleagues:<br>
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<p> There have been three minor electrical shock events over the
last month. Fortunately, no one was injured. In each case,
work was stopped and proper mitigations were put in place,
supervisors were notified, workers reported to Occupational
Medicine for evaluation, and investigations into the events and
potential extent of conditions were initiated.<br>
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The three events are summarized here for your information:<br>
• A worker in the Low Energy Recirculator Facility (LERF) was
in the process of removing a DC output conductor from a power
supply cabinet. Lock, Tag, & Try was applied per the
equipment procedure. The worker received an electrical shock
when their elbow brushed against the grounded cabinet frame. <br>
• A worker in Hall B was using a heat gun while applying
heat-shrink tubing. The heat gun was plugged into a permanent
outlet near the wire racks in Hall B. The worker inadvertently
touched the metallic end of the heat gun while it was powered on
and experienced a shock up to his elbow that was in contact with
the grounded equipment rack.<br>
• A worker in Hall A was using a portable bandsaw that was
plugged into an electrical outlet on a JLG-manlift when he felt
a slight shock in his forearm.<br>
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Although not considered contributing causes to these events,
here are some electrical safety reminders to keep in mind while
preparing for and conducting work:<br>
• Check tools and cords before use; look for possible frayed
or taped cords, damaged plug ends, missing plug prongs, and
cracked casings on tool bodies. Tag a tool out of service if it
is damaged. <br>
• Incorporate GFCI (ground fault circuit interruption)
protection when using electric hand tools.<br>
• Place the GFCI closest to the point where the power is
received.<br>
• Test the GFCI protection before use: Press the test button
on the front of the outlet (Power to the outlet should now be
removed). Now, press the reset button on the front of the
outlet (Power to the outlet should now be restored). The better
tool for testing a GFCI is a portable GFCI plug tester; shown
below. <br>
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<p><img src="cid:part1.FFDAE9BD.B940AC3D@jlab.org" alt=""> </p>
Electrical work concerns or questions may be directed to your
supervisor or to Electrical Safety Engineer, Todd Kujawa, at <a
moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:kujawa@jlab.org">kujawa@jlab.org</a>.<br>
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Thank you for your attention to this important safety message.<br>
<br>
Mary Logue<br>
Associate Director, ESH&Q Division<br>
Thomas Jefferson National Accelerator Facility<br>
12050 Jefferson Avenue, Suite 602<br>
Newport News, VA 23606<br>
757-269-7447<br>
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