請問junction box可以開孔嗎?
為了散熱需求，請問junction box可以開孔嗎?尺寸是否可以參考UL 1598 cl. 11.3.8來考量? 可以的啊，满足安全距离的要求就可以了 tolick回答没有依据。
请参考UL1598：
11.3 Junction boxes
11.3.1 A junction box that complies with the component requirements of Clause 4.1 and is attached to a luminaire may have openings that do not comply with Clauses 11.2.1 and 11.2.2.
11.2 Enclosures
11.2.1 The surfaces of an enclosure described in Clause 5.3.2 that are not visible from the room side shall have no open holes, except as specified in Clauses 11.3.8 and 11.4.3.
11.2.2 Open holes in the surface of an enclosure of live parts that are visible from the room side shall comply with the requirements of Clause 10.4. 可以开孔，按标准的来。 开孔与否，需要产品认证对应的标准来考量。建议LZ先熟悉标准，你这孔一开，引起的问题大把（电气间隙，散热，防尘要求等）。 產品是recess luminaire，使用class 2 power supply(無絕緣距離考量)，也不用防水防塵考量。但是依照cl. 11.3.8來解讀，好像開孔可以隨便開了，允許的尺寸很大?? 可以开孔，关于enclosure和Junction box的开孔要求是不一样的，Junction box 的开孔看下面这条即可。
12.3.8 An open hole in a box, such as a mounting-screw hole, shall have no dimension larger than 6.7
mm (0.265 in), except that a pryout hole or slot may be provided in a knockout for 1 in or smaller trade size conduit, provided that the area of the hole or slot is no more than 26 mm2 (0.040 in2).
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