electrical safety for home inspectors inspectapedia.com/electric/elecsafety.htm...
TRANSCRIPT
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Electrical Safety for
Home Inspectors
InspectAPedia.com/electric/ElecSafety.htm
InspectAPedia.com/electric/ElecPanelInsp.htm
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Home Inspector Deaths/Injuries
• Death from fall – impact on Standards
• Experience can lead to carelessness
Other reports: falls, attic stair collapses, crawl space inspector shocks, client shocks, one murder attempt
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How much electrical energy would it take to kill a home
inspector?
• Wet skin (sweaty or standing in water) – 1000 ohms resistance
• At 100 Volts – 0.1 to 0.3 Amps
• Potentially fatal ventricular fibrillation
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Standards Require Dangerous Activities
Such as opening the electrical panel
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Inspector shall “Observe”
• Electrical Inspection Starts Outside
•Observe the amperage & voltage ratings of the service
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Abandoned SEC’s
•Observe does not mean touch
•Don't assume old wires are “dead”•Anecdote:
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Panel inspection for water & rust begins outside
InspectApedia.com/electric/ElectricMeters.htm – how to inspect meters
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inspect-ny.com/electric/Electrical_Ground_Inspection.htm – how-to
inspect-ny.com/electric/Electrical_Ground_Lost.htm - case study
• Don’t assume the local grounding electrode is real – kick it
• Don’t assume the utility company ground is working
• Don’t assume the water pipes form a ground
• Don’t assume visible connections are good
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Opening the Electrical Panel is Dangerous
Atlanta GA: a licensed electrician was opening the panel for inspection.
When the cover was removed the spring-loaded bus assembly moved, an arc caused an electrical explosion, killing the inspector.
Statistically you are more likely to fall down the stairs or off of a roof (and live).
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Removing the Panel Cover
• Distance: Warn clients to keep back
• Assistance: Only you touch the panel
• Blocking: Stand so as to block your client
• Touching: Do not permit client to touch • Grounding: Check visually (& electrically ?)
My client asked, "What's this?" as he reached over my shoulder & stuck his finger straight into an open fuse socket
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Before Opening the Panel
• Look for wet floors or other water
• Look for burning, arcing, other damage
• Look for sheet metal screws in the cover
• Look for rust, water tracking on the panel
• Look for an escape path – can you step back?
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External signs of internal rust and water hazards
Notice the water pipe?
InspectAPedia.com/electric/HolmConf.htm – rust in panels
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External clues of internal hazards
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Water damage inside the electrical panel
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Electrical Screws & Screwing Around
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Panel Cover Screw Arc Flashover
Plastic pen may be a safer pointer
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Observe branch circuit conductors, overcurrent devices, compatibility of ampacities, voltages
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... I continued to put my arm behind my back and
close the breaker with my left hand with my head turned to the left. BAM, a light as bright as the sun and an explosion.
This knocked us down and blinded us. We were rushed to the hospital. I spent the night in the ER with an ICU nurse and was off of work for 3 weeks and have had to have a stronger prescription. These FPE panels are all over the building
InspectAPedia.com/fpe/fpepanel.htm
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Binding Steel Screw in AL Bus
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Electrical Panel Accessibilty
Remain calm, watch what you say –
A mumbled Rats Nest comment led to fleeing client
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Touching Electrical Equipment During an Inspection
• Never touch metal plumbing or gas system pipes
• Never touch electrical equipment while standing on a damp or wet surface
• Al Alk was a Knuckle Licker• Homeowner was a Knuckle Licker • YOU are the professional: use visual
inspection + instruments
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Using Test Equipment
• Tic Tracer, neon tester, outlet tester, VOM/DMM
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How to use a DMM
• Set the VOM/DMM in the highest AC-voltage range to start
• One probe is used to contact the surface of the electric panel (or any component to be examined)
• The other probe is touched to a reliable ground source, or in the example shown, to the neutral side of the circuit.
• More than 1or 2 volts between a service panel cover and ground = a safety problem
inspect-ny.com/electric/ElecSafetyDMMs.htm
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Not Required To:
• Insert any probe or equipment into the panel
• Test circuit breakers
• Pull Fuse Blocks ?
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Pulling Fuse Blocks
• I Pulled the main fuse block: the pullout block disintegrated in my hand
• Leaving one fuse in place & one half out of the panel
• "What did you just do to the panel?" asked the client
• "I destroyed it."
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Shut Down Unsafe Equipment?
• You are responsible whether you touch or not– Liable for failing to act, detect, warn – “Not inspected” disclaimers are inadequate– Report why, the hazard, what to do
• Last Person In rule: you were there, you are responsible
• What to tell the Judge – no heat, frozen pipes, vs. dead people
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Whom do you Notify of Dangers?
• Client – all findings
• Agents – unsafe conditions that you judge are immediate risk
• Owners/Occupants – immediate major safety hazards
• Anecdote: hot AL heating circuit; notified, owner scoffed, house burned down
• Professionals have a duty that extends beyond the client when immediate major hazards are observed
• Orally and in writing
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Observe Branch Circuit Conductors
• Aluminum wiring
• Damaged, not supported, rusty BX, overheated, etc.
• Knob and Tube?
InspectAPedia.com/aluminum/aluminum.htm
InspectAPedia.com/electric/Knob_and_Tube_Wiring.htm
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Observe Operate # of Lights, Switches, Receptacles in House,
Garage, Exterior
• Look before touching• Missing, broken covers• Metal cover plates?• Do we turn ON circuits
that are SHUT OFF?• Do we turn OFF
Circuits?
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Testing GFCIs
• Observe polarity & grounding
• Test GFCIs– Internal test– External test– On Knob & Tube?
• Test AFCIs – Internal test ONLY
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Examples of Unsafe Crawl Space Conditions
• Standing water or wet surfaces• Exposed wires, connections• Chemical odors• Rodents, snakes, insects, other pests• Inaccessibility (confined space rules)• Fiberglass insulation = high risk of mold
contamination in damp or wet areas• Unsafe structure – collapse risk
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Crawlspace Suggestions
• Do not work alone
• Carry a second flashlight
• Wear a respirator, coveralls, gloves, knee pads, shoe-covers as needed
• Carry a cell phone
• Use a camera and/or recorder to document conditions rather than notepad
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Safety Suggestions• Pay attention, look carefully, move slowly - Do not assume anything • Do not assume that electrical power is "off" • Do not assume that system grounding is complete • Do not assume that all circuit breakers work• Do not assume that bystanders or clients won't move suddenly • Do not touch live wires or connections• Eye protection: electrical panels can explode upon opening. • Insulating gloves: panels can become hot as a screw falls when cover is
removed. • Look before touching: Don't approach the panel until you give an overall
look of the surrounding area to see if anything looks wrong--such as water on the floor under the panel.
• Avoid Shock Pathways: Don't have any part of your body touching adjacent items
• Insulating floor pad: On a concrete or dirt floor, & rubber soled shoes• Insulating tools: Use insulated handle tools• Panel Door & Screws: Once door is open, set door aside and don't lose
the screws
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