Lightning Safety: Safe Shelters and Indoor Safety
What is a Safe Shelter?
A house or other substantial building offers the best protection from
lightning. In assessing the safety provided by a particular structure, it is
more important to consider what happens if the structure gets struck by
lightning, rather than whether the structure will be hit by lightning. For a
shelter to provide protection from lightning, it must contain a mechanism for
conducting the electrical current from the point of contact to the ground.
These mechanisms may be on the outside of the structure, may be contained
within the walls of the structure, or may be a combination of the two. On the
outside, lightning can travel along the outer shell of the building or may
follow metal gutters and downspouts to the ground. Inside a structure,
lightning can follow conductors such as the electrical wiring, plumbing, and
telephone lines to the ground.
Avoid Unsafe Shelters!
Unless specifically designed to be lightning safe, small structures do little,
if anything, to protect occupants from lightning. Many small open shelters on
athletic fields, golf courses, parks, roadside picnic areas, schoolyards and
elsewhere are designed to protect people from rain and sun, but not lightning.
A shelter that does not contain plumbing or wiring throughout, or some other
mechanism for grounding from the roof to ground is not safe. Small wooden,
vinyl, or metal sheds offer little or no protection from lightning and should
be avoided during thunderstorms.
How Lightning Enters a House or Building
There are three main ways lightning enters homes and buildings: (1) a direct
strike, (2) through wires or pipes that extend outside the structure, and (3)
through the ground. Regardless of the method of entrance, once in a structure,
the lightning can travel through the electrical, phone, plumbing, and
radio/television reception systems. Lightning can also travel through any metal
wires or bars in concrete walls or flooring.
Stay Safe While Inside
Phone use is the leading cause of indoor lightning injuries in the United
States. Lightning can travel long distances in both phone and electrical wires,
particularly in rural areas. Stay away from windows and doors as these can
provide the path for a direct strike to enter a home. Do not lie on the
concrete floor of a garage as it likely contains a wire mesh. In general,
basements are a safe place to go during thunderstorms. However, there are some
things to keep in mind. Avoid contact with concrete walls which may contain
metal reinforcing bars. Avoid washers and dryers since they not only have
contacts with the plumbing and electrical systems, but also contain an
electrical path to the outside through the dryer vent.
Remember Your Pets
You may want to consider the safety of your family pets during thunderstorms.
Dog houses are not lightning-safe. Dogs that are chained to trees or chained to
wire runners can easily fall victim to a lightning strike.
Protect Your Personal Property
Lightning also causes significant damage to personal property each year. In
addition to direct strikes, lightning generates electrical surges that can
damage electronic equipment some distance from the actual strike. Typical surge
protectors will NOT protect equipment from a lightning strike. To the extent
possible, unplug any appliances or electronic equipment from all conductors
well before a thunderstorm threatens. This includes not only the electrical
system, but also the reception system. If you plan to be away from your home
when thunderstorms are possible, be sure to unplug unneeded equipment before
you leave.
Summary of Lightning Safety Tips for Inside the Home
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Avoid contact with corded phones
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Avoid contact with electrical equipment or cords. If you plan to unplug any
electronic equipment, do so well before the storm arrives.
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Avoid contact with plumbing. Do not wash your hands, do not take a shower, do
not wash dishes, and do not do laundry.
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Stay away from windows and doors, and stay off porches.
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Do not lie on concrete floors and do not lean against concrete walls.