E
epierce
Hi all,
We're looking for guidance on flame-rated plastics usage in our power wheelchairs. RESNA standards are our typical go-to, but unfortunately they only address upholstery flammability. I've tried to dig through these two standards for guidance, and I wonder if anyone could just verify that I'm interpreting them somewhere near correctly..
IEC-60601:2005 seems to only dictate material flammability (among other things) for "fire enclosures," which are intended to mitigate the risk associated with circuitry where a single fault test has revealed a heat or ignition hazard.
UL-60601:2003, on the other hand, says that all polymeric external surfaces on a device need to be UL94-V2 rated (in the case of a mobile device).
To apply this to a typical situation for us.. Let's say I have a drive motor that's well over 15W, with a plastic shroud that covers it. My read is that as long as the single fault tests (capacitor open/short and max voltage w/ locked rotor) don't result in excess temperature or emission of flames, then IEC says that the shroud doesn't need to conform to fire enclosure requirements. Beyond that, it has no requirements. UL would count the shroud as an enclosure, and therefore would need V2 rating.
Am I way off??
Thank you!
Eldon
We're looking for guidance on flame-rated plastics usage in our power wheelchairs. RESNA standards are our typical go-to, but unfortunately they only address upholstery flammability. I've tried to dig through these two standards for guidance, and I wonder if anyone could just verify that I'm interpreting them somewhere near correctly..
IEC-60601:2005 seems to only dictate material flammability (among other things) for "fire enclosures," which are intended to mitigate the risk associated with circuitry where a single fault test has revealed a heat or ignition hazard.
UL-60601:2003, on the other hand, says that all polymeric external surfaces on a device need to be UL94-V2 rated (in the case of a mobile device).
To apply this to a typical situation for us.. Let's say I have a drive motor that's well over 15W, with a plastic shroud that covers it. My read is that as long as the single fault tests (capacitor open/short and max voltage w/ locked rotor) don't result in excess temperature or emission of flames, then IEC says that the shroud doesn't need to conform to fire enclosure requirements. Beyond that, it has no requirements. UL would count the shroud as an enclosure, and therefore would need V2 rating.
Am I way off??
Thank you!
Eldon