There are several UL standards that are clearly applicable to lighting equipment, and in fact many standards apply to lighting equipment. As with audio equipment, the standard used to test lighting products depends on the product itself and where the product will be used, as well as the opinions of the testing unit. Many manufacturers of lighting control products complain that different manufacturers and similar products must meet different requirements. This is because the testing personnel of different testing units believe that the requirements for product compliance are different.
UL1573, the standard for stage and studio lighting and connectors, is a standard for stage and studio lighting commonly used in theaters, film studios and similar venues. Applicable products include field lights, spotlights, floodlights and footlights, whether or not these lamps use white, fluorescent or high-intensity discharge tubes. This standard also applies to connectors, lifting boxes and other similar products. Many people in the industry think that these products are not necessary and follow certain standards, but in fact they must follow certain standards. There are other standards that apply to other lighting products. For example, UL2388, the activity lighting product standard applies to the cycle lights we usually call. UL588, the holiday decoration product standard is applicable to decorative light products and accessories for short-term use (less than 90 days). There are many other standards for general lighting, fixtures for hazardous locations, etc., but UL1573 is a standard commonly used in the entertainment industry.
The lighting control dimmer can use many standards and there are many inconsistencies. Since the current dimming station is generally a computer, UL60950, information technology equipment safety standard, it has become a commonly used standard, but sometimes it also uses UL508, industrial control equipment standard. Although UL508 is the standard for "industrial control equipment and accessories for starting, stopping, regulating, controlling or protecting electric motors", it is also applicable to "dimming systems and control products" and "industrial microprocessors/computer systems." ".
No standard fits well with a theater dimming system. Dimming systems typically use a combination of UL508 and UL891 "Safety Switch Board Standards" to test electronic safety. In general, UL508 is suitable for the standard of the module, while UL891 is suitable for the cabinet with the module installed. Strictly speaking, what requirements should be met by the product should be confirmed with the testing unit. Many people feel that this is a headache. This one-by-one confirmation means that similar products produced by different manufacturers cannot use the same standard requirements. Moreover, if the laboratory personnel change, the product testing procedures must be re-examined and re-discussed. This is very irritating.
I heard that there is a UL internal file (sometimes not used sometimes). This document lists some of the requirements of the control standard that the theater dimming system should meet. Our Power Working Group has also said that writing a similar document, based on our ANSI-approved procedures, can address the inconsistency of the standard in terms of testing requirements. But it has not yet begun to be officially done.
Portable power distribution equipment for theaters, festivals, and movie studios can also be tested for safety using the UL1640, portable power distribution equipment standard; however, many of the power distribution equipment used in the United States has not been tested. The reason is that many power distribution equipment is specially customized. The UL inspection program is used to check the safety of products produced on the production line. It is used on products that are produced separately. It is not too expensive to use, and it is usually necessary to disassemble the product for inspection. For example, one of the requirements of the UL 1640 standard is to do drop tests. The product to be tested should be dropped from the 1.8 m height to the concrete floor three times, and no accessories were allowed to fall out. This is a good test, but if a product passes such a test, I am afraid it has been damaged.
1
Danfoss Thermostatic Expansion Valves
Thermostatic Expansion Valves,Danfoss Valve,Expansion Valve
Maidi Heating And Refrigerating Equipment Co., Ltd. , http://www.lydccompressor.com