![]() The safety certifications have interesting Conditions of Acceptability. An interesting note for this component is that the device, when used with proper construction, is also certified for use in medical equipment where two means of patient protection are required ie where an instrument must be certified for patient contact.Ĭurrent test certificates apply only to North America. The component is intended to provide isolation from a hazardous voltage (eg AC mains) that is safe to touch. ![]() For a complete safety requirements analysis, please consult an accredited NRTL/SCC lab for use in North America.ĭepending on the particular model number of 4160 and the scoped safety standard for the end-use equipment, rated WV is from 125Vrms to 400Vrms. Please do not confuse rated working voltage with the rated di-electric withstand voltage.This analysis is not intended to be applied to any product for sale, or where the product is used in commercial equipment. Have reviewed the component's safety certificates and the PCB layout. Use incorrectly, could result in shock and/or fire hazard. Used within its limits, should preserve life and equipment. Hobbyist will use this so that they can use a mains-connected computer or test instrument on a widget that may be reference to mains neutral, hence the panel ground. To interrupt a current loop between secondary and mains typically requires BI for Class I construction, and RI for Class II construction. But this test level does nothing to indicate the rated working voltage of the device. The test level for Basic Insulation for stuff that is plugged in 240 mains is typically 1500Vac, assuming Class I construction. This is a test level that is based on end-use Installation Category and the measured working voltage. The correct term is "Rated Di-electric Withstand Voltage". The rated 'Isolation' voltage is NOT the same as the rated working voltage. basic, double, reinforced) and the measured working voltage across the isolation boundary and the what is exposed in the end-use construction.Īccording to the respective PCB layout on github, the available spacing is much less than 7.7mm. The 'standard' creepage and clearance depends on the scoped product safety standard and the type of insulation required (e.g. Please note following and please be careful not to mislead others on this important topic. The isolation gap down the center is the standard 7.7mm for 1.2kV isolation, but hasn't been tested at that voltage. Making boards hackable for people who know what they're doing outside that range is still a design goal, but it's lower on our list of priorities.Adafruit_support_mike wrote:I'm afraid we don't have any specs for those. If we can simplify a layout or save board area by taking advantage of those rules, we will. Our design rules will always be for operation at 24v or less though, and mostly in the 0v-5v range. We respect the freedom of our peers to do the same, and try not to deliberately sabotage designs to make them unhackable. We accept responsibility for that risk though, and we know how to manage it. as hardware hackers we're all about voiding warranties, modifying devices, and using them at our own risk. In some cases, a person with appropriate experience will find it easy to modify one of our boards to operate way outside its nominal range, but that's an at-your-own-risk thing. We do have more training than our average customer though, and we make a lot of tools for ourselves. A board that can work safely in a high voltage environment doesn't, by itself, make working with high voltage safe, so our official stance is, "if you don't already know how to do it safely, don't do it at all until you've had proper training." ![]() Our overall goal is to be beginner friendly, and we have to be mindful of the people who don't know what they don't know. Officially, the board is only sold for 5v operation.
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