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. Not sure how realistic this failure case is for devices which are powered from the host, but for devices with external power this seems smart.Adafruit_support_mike wrote:I'm afraid we don't have any specs for those. It seems advisable to use some sort of external device after all. Source detects its output Voltage exceeds its limits triggering The Over-Voltage Protection Event bit May be set when the It doesn't seem quite that simple after all, over-voltage protection may not be covered: 6.4.6.1.6 Over-Voltage Protection Event My understanding is, that the USB controller will detect the fault, disconnect the device and then upon reset and/or reboot it would start working again.Įxternal protection circuits should not be required, at least that is my takeaway. To ensure interoperability with other compliant Devices.Īt this point I am already confident enough to plug the device into my computer, so I'll stop digging into the details here. Designers are mandated to implement all such requirements Shall and Normative are equivalent keywords indicating a mandatory "Shall" means, that this is a mandatory requirement: 1.4.2.11 Shall/Normative Protection to prevent damage from output current thatĮxceeds the current handling capability of the Source. Sources operating in SPR mode Shall implement over current I was concerned about connecting a Raspbery Pi Pico device to my brand new computer and did some digging in the "USB Power Delivery" specification: 7.1.7.1 Output Over Current Protection Please note, that I have no experience in this field, this is simply what I found after some digging.
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