Appendix 11 Measuring Contact Resistance
A27
Appendix
(3) Resistance in the open state
Generally, contacts have a resistance value of at least 10 M when in the open state. The
initial insulation resistance varies greatly with the insulating properties of the enclosure and
tends to decline due to dirt on the contacts and nearby dust. To ascertain the resistance in
the open state, it is necessary to measure the resistance value with the maximum voltage
that could be applied to the open contacts. Consequently, insulation resistance testers that
are used to inspect power distribution equipment are designed so that they can apply high
voltages ranging from 25 V to 5 kV.
(4) Standards related to contact resistance
Below is a list of some representative standards relating to the measurement of resistance.
Please see individual standards for more information about their specific provisions.
JIS C 2525 Testing method for conductor-resistance and resistivity of metallic resistance
materials
JIS C 3001 Resistance of Copper Materials for Electrical Purposes
JIS C 3002 Testing methods of electrical copper and aluminium wires
JIS C 3005 Test methods for rubber or plastic insulated wires and cables
JIS C 3101 Hard-drawn copper wires for electrical purposes
JIS C 3102 Annealed Copper Wires for Electrical Purposes
JIS C 3152 Tin Coated Annealed Copper Wires
JIS C 4034 Rotating electrical machines
JIS C 5012 Test methods for printed wiring boards
JIS C 5402 Connectors for electronic equipment
JIS C 5442 Test methods of low power electromagnetic relays for industrial control circuits
JIS C 8306 Testing methods for wiring devices
JIS H 0505 Measuring Methods for Electrical Resistivity and Conductivity of Non-Ferrous
Materials
JIS K 7194 Testing method for resistivity of conductive plastics with a four-point probe
array
Reference URL http://www.jisc.go.jp/eng/
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