Highfields Amateur Radio Club
Constructors Corner.
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Warning Symbols on Electrical Equipment.
By Brian, MW0GKX.

Here is a collection of warning signs or labels that may be affixed to various pieces of electrical, electronic and radio equipment, components or installations and what they mean.

Labels may or may not have further information written on them.

If there are any that you think should be included, let me know so I can add them.

The best way to deal with any hazard warning sign is:- If in doubt, Keep Out!

no touch

no touch
Do Not Touch.
This is often found on Electrostatic Sensitive devices but may also mark areas of high temperature or high voltage.
Use ESD precautions when transporting or handling components or modules marked with this symbol if text states ESD or Static Sensitive.
See ESD page.
static sensitive Electrostatic Sensitive Device.
Use ESD precautions when transporting or handling components or modules marked with this symbol.
See ESD page.
lightning bolt - high voltage High Voltage.
The 'lightning strike' is used internationally as a general electrical high voltage hazard warning.
Other information may be added with text, ie:-
info example High Voltage (may indicate voltage level).
info example Risk of Electric Shock.
laser

laser
Laser radiation.
Found on CD and DVD players and recorders. Looking at the beam may cause blindness.
microwaves Microwave Radiation.
This warning sign is not intended or necessary for domestic type microwave ovens but may be found on microwave transmitters.
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RF field

RF field
Radio Frequency Radiation.
These warning signs may be present where transmitters and antennas are radiating Radio Frequency at levels that may be hazardous to health.

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