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2014-02-05
20140205 Safety Information
Information products apply UL60950-1, using UL 507 (ZPWV2) recognized DC fan is not
directly used in the primary circuit
For UL507 (UL CCN: ZPWV2) recognized DC fan following Fig 1, according to UL507
certification requirements below apply only to such DC fan inside the isolated secondary
voltage circuits (. Follows ILL 1 DC OUTPUT line), the original requirements are as follows :
2.2.15 LOW VOLTAGE COMPONENT FAN – A component fan intended to be used in isolated
secondary circuits and rated a maximum of 30 V rms (42.2 V peak) or 60 V dc.
To such a fan if the product will be designed for use in the primary side (Primary circuit
or transformer-isolated front line) when the non-low-voltage circuit, the test can be
evaluated in accordance with the non-certified product with the fan mode.
To the power supply (Switching Power Supply) as an example:
DC Fan is directly connected to the primary side of the step-down voltage, and then lock
attached EARTHED steel, and the bit at the primary side needs to assess the following:
1. FAN plastic V2 flammability rating to more than.
2. Insulation & insulated from the least to meet the BASIC insulation requirements
(FAN lock attached EARTHED steel).
3. The need for the VW-1 wire.
4. Part abnormal test to consider.
5. UL60950-1, ANNEX B asked to consider the assessment provisions.
directly used in the primary circuit
For UL507 (UL CCN: ZPWV2) recognized DC fan following Fig 1, according to UL507
certification requirements below apply only to such DC fan inside the isolated secondary
voltage circuits (. Follows ILL 1 DC OUTPUT line), the original requirements are as follows :
2.2.15 LOW VOLTAGE COMPONENT FAN – A component fan intended to be used in isolated
secondary circuits and rated a maximum of 30 V rms (42.2 V peak) or 60 V dc.
To such a fan if the product will be designed for use in the primary side (Primary circuit
or transformer-isolated front line) when the non-low-voltage circuit, the test can be
evaluated in accordance with the non-certified product with the fan mode.
To the power supply (Switching Power Supply) as an example:
DC Fan is directly connected to the primary side of the step-down voltage, and then lock
attached EARTHED steel, and the bit at the primary side needs to assess the following:
1. FAN plastic V2 flammability rating to more than.
2. Insulation & insulated from the least to meet the BASIC insulation requirements
(FAN lock attached EARTHED steel).
3. The need for the VW-1 wire.
4. Part abnormal test to consider.
5. UL60950-1, ANNEX B asked to consider the assessment provisions.
