2008年2月26日 · So to your 10ft tap rule, UL would apply in the construction of the panel at your shop, not the NEC. But there is the same requirement in UL 508A to address that and although worded differently, the net result is the same as the NEC. You can do it, but with rules. For example: UL 508A, Section 31.4 The ampacity of the tap conductors, the internal

2016年4月27日 · It was brought to my attention that UL508A had a wire color code change in the 2013 edition. I have been told that the new edition states some drastic changes from the previous release: 24VDC common, unless it is grounded, should be blue, any wire that does not turn off with the panel...

2014年1月23日 · The UL 508A certification is given through inspection by a Nationally Recognized Testing Laboratory (NRTL). This UL label, classified as UL-508A, when applied to an industrial Control System, is a symbol of Quality and Reliability, and also guarantees Compliance with NEC and NFPA standards as well as Safety standards.

2016年2月2日 · UL used the same nomenclature, and essentially the same requirements as NEMA did, effectively replacing them. As far as I know, a UL type enclosure meets all the NEMA requirements for the same type of enclosure, but is also listed, where as a NEMA type enclosure is not necessarily listed.

2009年1月25日 · They are evaluated under two separate UL Standards; 845 and 508A respectively. ... Well at least get a ...

2018年12月13日 · You can use a UL 489 breaker anywhere, but you cannot substitute a UL 489 breaker with a UL 1077 breaker. The UL 508 listing will be required for an assembly of products, each with different listings.Basically, if you piece together an OCPD combo and enclosure it needs to be fabricated by a UL 508 recognized shop. So...

2003年3月18日 · The panel builder should adhere to UL 508. However, since there is the product application also needed after the product sale, the manufacturers foresee the product adherence to NFPA safety codes. Therefore, it is prudent to follow not only the industry standards but also the safety code related to the product after it is sold and installed.

2011年11月21日 · Our UL inspector would not allow us to use a UL 1778 listed power supply. He said it had to have a UL 508 listing. I've called Tripplite, APC, Eaton and they all say they use UL 1778 not UL 508. We got our UL listing by removing the UPS and plugging the pigtail into the receptacle and stating the UPS is a optional accessory.

2021年4月14日 · Just when you think UL 508 is making sense to you, it's not. Hoping to use a Heyco flex NM liquidtight 1/2 conduit connector (#8402) on enclosure . Piece is UL Listed , but no NEMA environmental rating is listed , only IP 68 is given in any Heyco literature . UL 508A section 19 comes in to play here .

2021年7月2日 · I wanted to make sure i had this correct. what is the maximum branch circuit protection allowed for both the primary and secondary sides of a 1500 VA 480/120 volt single-phase power transformer. Primary: 1500/480 = 3.125 using table 35.2 in UL 508A standard 3.125 * 2.5 = 7.8125 Secondary...