4.10 Static Electricity during Testing.
As the probe is moved over the surface of a coating, a static
charge builds up which can:
- cause objects in contact with the surface to become
charged with the same polarity
and
- induce an opposite charge on nearby objects electrically
insulated from the surface.
The following examples demonstrate the possible effects on
the Operator if inside a short pipe insulated from the ground.
Operator without rubber gloves
or footwear:
The Operator is touching the
coating
The body then becomes charged
at the same polarity as the coating
No shock if the coating is touched
The Operator gets a shock
steppingfromthepipetothe
ground
Operator wearing rubber gloves
and footwear:
The rubber gloves and footwear
insulate them from the coating
The body becomes charged with
the opposite polarity to the
coating
If an uninsulated part of the
Operator touches the coating,
discharge will cause a shock
The Operator gets a shock
steppingfromthepipetothe
ground
Avoiding Static Shock.
A conductive strap between the Operator and the ground will
stop the body from becoming charged. Rubber gloves and
footwear should also be worn. There may still be a shock inside
the pipe if an uninsulated part of the body touches the charged
coating.
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