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(6) Use a three wire type soldering iron including a grounding wire.
Metal plate (of aluminium, stainless steel, etc.)
Bare copper wire (for body earth)
Screw stop at the screwed
part using a rag plate
Use a high insulation mode (100V, 10M
(7) In checking circuits for maintenance, inspection or some others, be careful not to have the test probes of the
measuring instrument shortcircuit a load circuit or the like.
Staple
Fig. 3. Grounding of the working table
Soldering iron
Fig. 4. Grounding a soldering iron
or higher) when ordinary iron is to be used.
– 2 –
Working
table
Resistor of 1 M
(1/2W)
Earth wire
Grounding
wire
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