UL8750 Ed.2 will take effect on November 2, 2020
The revised version of the LED driver standard UL8750 Ed.2 will take effect on November 2, 2020. If the re-evaluation work according to the new standard is not completed before this date, the listing will be forcibly terminated and the UL mark shall not be used.
I would like to remind the power supply manufacturers that have been independently certified, and the lighting manufacturers that use random power supplies, to carry out the UL8750 standard update assessment as soon as possible, update the UL file, and maintain the validity of the UL certification.
Successful update case
At present, the manufacturers that have successfully completed the UL8750 standard update evaluation through New Oriental testing and certification include: Shenzhen Yiguang, Zhuhai Shengchang, Dongguan Lingguan, Dongguan Xijiantian, Ningbo Longyuan, Jiangbei Huarui Electronics, and so on.
To learn more about UL8750 standard upgrade details, please contact our marketing staff!
Wired control circuit in LED power supply
Mainly used to adjust the output power of the power supply, transmit control data, etc., including DALI control, 0-10V dimming, PWM dimming, temperature protection, ambient light sensing and other applications, so as to realize manual or automatic light output adjustment of lamps.
The latest revision of UL8750 appendix SF, mainly to increase the exemption clause "Exception 2" for the control circuit to exempt the safety isolation requirement.
§ Exception No. 1
The dimming and other control loops in the LED driver must be completely isolated from all other loops, or meet the following conditions a) ~ e), the isolation circuit is not required, and only the corresponding update labels and instructions are required.
a) If the control circuit will not be exposed, it is wrapped in a fire-proof/electric shock-proof enclosure;
b) The control circuit has passed the abnormal test to prove that there is no danger of fire and electric shock;
c) The control circuit cannot affect the isolation of the primary circuit or other secondary circuits;
d) The control circuit is marked with SF8.4 warning slogan: "Notice: This circuits not isolated-see installation instruction"
e) The description of SF8.5 is added to the installation manual.
§ New exemption clause Exception No. 2
When the following conditions a) to e) are met, the control circuit and the secondary circuit can be exempted from isolation requirements.
a) The secondary output circuit is Class 2;
b) The control circuit has been evaluated as a class 2 circuit, or used to connect to an external class 2 power supply;
c) Carry out circuit analysis and/or component abnormality (short circuit damage) test to ensure that the interconnection of these two circuits will not cause the output level (voltage, current, power) of any one circuit to exceed the class 2 limit requirements;
d) Other required isolation, class 2 or LVLE power circuit will not be affected;
e) Installation instructions include relevant information described in SF8.5.
If the control circuit is used to connect an external class 2 power supply, the analysis and testing in c) will be carried out using the power supply with electrical characteristics (voltage, current, power) specified in SF8.5 a).
§ SF8.5 LED equipment installation instructions
a) Describe the electrical characteristics of the control circuit;
b) The expected function of the control circuit;
c) Please refer to SF8 Marking for the detailed description of the product label. The LED equipment requires identification to distinguish the terminals or wires of the control circuit and the applicable expected industry or proprietary control circuit protocol;
d) The manufacturer’s recommendations for the correct installation of the control circuit (for example: acceptable system wiring configuration, precautions for load distribution, acceptability of the control circuit exiting the luminaire, acceptable control and transmission that can be integrated with the control circuit Sensing devices, etc.);
e) The manufacturer recommends to ensure that the cumulative leakage current of the control circuit is less than 3.5mA.
The revised version of the LED driver standard UL8750 Ed.2 will take effect on November 2, 2020. If the re-evaluation work according to the new standard is not completed before this date, the listing will be forcibly terminated and the UL mark shall not be used.
I would like to remind the power supply manufacturers that have been independently certified, and the lighting manufacturers that use random power supplies, to carry out the UL8750 standard update assessment as soon as possible, update the UL file, and maintain the validity of the UL certification.
Successful update case
At present, the manufacturers that have successfully completed the UL8750 standard update evaluation through New Oriental testing and certification include: Shenzhen Yiguang, Zhuhai Shengchang, Dongguan Lingguan, Dongguan Xijiantian, Ningbo Longyuan, Jiangbei Huarui Electronics, and so on.
To learn more about UL8750 standard upgrade details, please contact our marketing staff!
Wired control circuit in LED power supply
Mainly used to adjust the output power of the power supply, transmit control data, etc., including DALI control, 0-10V dimming, PWM dimming, temperature protection, ambient light sensing and other applications, so as to realize manual or automatic light output adjustment of lamps.
The latest revision of UL8750 appendix SF, mainly to increase the exemption clause "Exception 2" for the control circuit to exempt the safety isolation requirement.
§ Exception No. 1
The dimming and other control loops in the LED driver must be completely isolated from all other loops, or meet the following conditions a) ~ e), the isolation circuit is not required, and only the corresponding update labels and instructions are required.
a) If the control circuit will not be exposed, it is wrapped in a fire-proof/electric shock-proof enclosure;
b) The control circuit has passed the abnormal test to prove that there is no danger of fire and electric shock;
c) The control circuit cannot affect the isolation of the primary circuit or other secondary circuits;
d) The control circuit is marked with SF8.4 warning slogan: "Notice: This circuits not isolated-see installation instruction"
e) The description of SF8.5 is added to the installation manual.
§ New exemption clause Exception No. 2
When the following conditions a) to e) are met, the control circuit and the secondary circuit can be exempted from isolation requirements.
a) The secondary output circuit is Class 2;
b) The control circuit has been evaluated as a class 2 circuit, or used to connect to an external class 2 power supply;
c) Carry out circuit analysis and/or component abnormality (short circuit damage) test to ensure that the interconnection of these two circuits will not cause the output level (voltage, current, power) of any one circuit to exceed the class 2 limit requirements;
d) Other required isolation, class 2 or LVLE power circuit will not be affected;
e) Installation instructions include relevant information described in SF8.5.
If the control circuit is used to connect an external class 2 power supply, the analysis and testing in c) will be carried out using the power supply with electrical characteristics (voltage, current, power) specified in SF8.5 a).
§ SF8.5 LED equipment installation instructions
a) Describe the electrical characteristics of the control circuit;
b) The expected function of the control circuit;
c) Please refer to SF8 Marking for the detailed description of the product label. The LED equipment requires identification to distinguish the terminals or wires of the control circuit and the applicable expected industry or proprietary control circuit protocol;
d) The manufacturer’s recommendations for the correct installation of the control circuit (for example: acceptable system wiring configuration, precautions for load distribution, acceptability of the control circuit exiting the luminaire, acceptable control and transmission that can be integrated with the control circuit Sensing devices, etc.);
e) The manufacturer recommends to ensure that the cumulative leakage current of the control circuit is less than 3.5mA.