2021年11月1日起，UL8750更新條款將正式實行，請見如下是一些對產(chǎn)品影響較大的UL8750更新的條款解讀

條款1：SUPPLEMENT SE–REQUIREMENTS FOR CLASS P LED DRIVERS

SE5.3 A driver with field-wiring leads, field-wiring terminals, or push-in terminals shall be marked “Use only within an enclosure” or equivalent. The marking may be provided in an installation guide or equivalent accompanying document.

帶有現(xiàn)場接線、現(xiàn)場接端子或者推入式端子的CLASS P LED 驅動需要標上“Use only within an enclosure”或等效標簽。標簽可以印在產(chǎn)品或者說明書上。

條款2:  6.7 Polymeric potting compound

6.7.3 Polymeric potting compound that can touch any part of the insulation system of a transformer shall be tested in accordance with Supplement SA– Substitutions or Modification to an Electrical Insulation System in the Standard for Systems of Insulating Materials–General, UL 1446.

Exception No.1: This test does not apply if the transformer is not used for the mitigation of the risk of electric shock or is not used to separate Class 2 circuits or LVLE circuits from hazardous circuits.

Exception No.2: This test does not apply if the transformer insulation system already includes the potting.

Exception No.3: This test does not apply if the insulation system is used up to the temperature permitted for class 105 (A) according to Table 8.1 of this standard.

Exception No.4: This test does not apply for thermosetting potting compounds where the insulation system of a transformer utilizes a thermoset varnish which completely encloses the coil windings- preventing the potting compound from making contact with the winding wire insulation.

灌封膠如果接觸到變壓器絕緣系統(tǒng)任何部分，就需要根據(jù)Supplement SA–Substitutions or Modification to an Electrical Insulation System in the Standard for Systems of Insulating Materials–General, UL 1446 進行測試。

例外1：如果變壓器不用于減輕電擊風險或不用于將Class 2電路或LVLE電路與危險電路分開，則該測試不適用。

例外2：如果變壓器絕緣系統(tǒng)已經(jīng)包括灌封膠，則該測試不適用。

例外3：如果絕緣系統(tǒng)的使用溫度達到本標準表8.1規(guī)定的105(A)級允許的溫度，則該測試不適用。

例外4：如果變壓器的絕緣系統(tǒng)使用熱固性清漆，并完全包圍繞組線防止熱固性灌封膠與繞組絕緣接觸，則該測試不適用。

條款3：7.2A.2 Grounding

7.2A.2.7 When the path between the grounding connection means and the ground termination point in the product includes PWB traces, the construction is to be evaluated per the bonding conductor tests in 8.23.

不接地連接裝置和接地端接點之間的路徑包括PWB走線時，需要評估8.23 bonding conductor tests。

條款4：SUPPLEMENT SF–LED EQUIPMENT WITH WIRED CONTROL CIRCUITS

LED設備中用於控制功率、光輸出特性、操作或性能數(shù)據(jù)傳輸?shù)鹊目刂齐娐沸枰胶蟂F 的要求。

Marking requirement

1. Identification of the terminals or lead wires for control circuits, Identification of the intended industry or proprietary protocols;

2. Device wired control circuit marked ‘Class 2’;

3. “CAUTION: More than one power supply present” or equivalent;

4. “Notice: This control circuit is not isolated - see installation instructions” or equivalent;

5. Installation instructions.

Marking 要求

1. 控制線路端子或電線識別，行業(yè)或專有協(xié)定識別；

2. “Class 2”如控制線路已評估Class 2或外接Class 2電源；

3. “CAUTION: More than one power supply present” 如控制線路是外接非Class 2電源；

4. “Notice: This control circuit is not isolated - see installation instructions” 如控制電路是非隔離并滿足豁免條款SF3.1；

5. 安裝說明。

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