INTRODUCTION
9
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Pinholes in Insulation
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Inadequate Spacing of Components
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Pinched Insulation
1.7 The Ground Bond Test
The Ground Bonding test determines whether the safety ground circuit of the product
under test can adequately handle fault current if the product should ever become
defective. A low impedance ground system is critical in ensuring that in the event of a
product failure a circuit breaker on the input line will act quickly to protect the user from
any serious electrical shock.
International compliance agencies such as CSA, IEC, TÜV, VDE, BABT and others,
have requirements calling out this test. This test should not be confused with simple low
current continuity tests that are also commonly called out in some safety agency
specifications. A low current test merely indicates that there is a safety ground
connection, it does not completely test the integrity of that connection.
Compliance agency requirements vary on how different products are to be tested. Most
specifications call for test currents of between 10 and 30 amps. Test voltages at these
currents are typically required to be less than 12 volts. Maximum allowable resistance
readings of the safety ground circuit are normally between 100 and 200 milliohms.
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