3) Wire thickness required
Rated current appliance(A) Nominal cross-sectional area(mm
2
)
Up to and including 6 0.75
Over 6 up to and including 10 1.0
Over 10 up to and including 16 1.5
Over 16 up to and including 25 2.5
Over 25 up to and including 32 4.0
Over 32 up to and including 40 6.0
Over 40 up to and including 63 10.0
For rated currents up to 3A, a nominal cross-sectional area of 0.5mm
2
is only allowed if the length of the cord
does not exceed 2m.
1.2 Internal factors check
1.2.1 Insulation resistance
Measure the insulation resistance between live part and dead metal part by 500V insulation resistor to
check if the insulation resistance is more than 10MΩ.
1.2.2 Insulation resistance measurement of compressor
Measure the insulation resistance of compressor between compressor terminal and dead metal part by insu-
lation resistor, and the insulation resistance should be above 10MΩ.
Compressor may change the insulation resistance while running. Accordingly, measure the insulation
resistance just after running as needed.
• Note: For R-22 used in airconditioner, the dielectric rate on liquid state is high. If a contaminant is mixed
into R-22, the electric resistance is extremely low and the poor insulation is occurred. Accordingly,
be sure to prevent contaminants from mixing into refrigerant system.
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