Annex B Safety Knowledge
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Annex B Safety Knowledge
Guide:
Importance of safety test
B.1 Importance of safety test
With the advancement of society, human needs constantly increase, paying more
attention to safety, including electrical safety, traffic safety, food safety and environmental
safety etc. The national and international organizations issued a variety of laws and
regulations to protect people's safety interests; with the development of electronic and
electrical applications, electrical equipments are widely used. Imagine how dangerous it is to
touch potential live unsafe electrical equipment, so electrical safety is extremely important. It
is necessary to use appropriate instruments to test safety of electrical equipments, in order to
enable the manufacture to use quantitative means to confirm the safety of electrical
equipments.
In the following conditions, safety analyzers shall be used to test the performance of
various products:
● Design stereotypes - to determine the designed product reach the required conditions.
● Routine production check - confirm the produced products can meet the requirements.
● QA confirmation - confirm the quality of the products can meet the safety standards.
● Safety check after repair - confirm repaired products meet safety standards.
B.2 GB
GB is mainly adopted to measure the on-resistance between the metal house of electrical
equipment which can be touched and the safe ground terminal of the device. The
measurement approach is in accordance with the principle of Ohm's law. High current will go
through the ground loop. Then the current and voltage values were measured. Then the
resistance value is calculated following Ohm's Law. A large current, the abnormal current
generated as the simulation apparatus is abnormal is adopted as the standard of test. If the
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