Re: UL544 Leakage Limits Patient Equipment*

It may not be important whether you call it an applied part or not. You are not making a direct electrical connection to the patient. In any case you should meet the leakage requirement. This should be easy with properly insulated earphones. IEC 60950 also addresses this issue and throws in more

RE: UL544 Leakage Limits Patient Equipment*

I also agree that the headphones are a patient connection. Hi, Its been a while since I looked at UL 544, but a few comments. 1. Headphones are an applied part (UL2601-1) or patient connection (UL544). They come into direct contact with the patient. You can argue that they are an

RE: UL544 Leakage Limits Patient Equipment

Good Day - First, why are you using UL544? Why not use UL2601, based on IEC601-1 with US deviations? Beware, UL544 UL187 may be used until Jan 1 2003, after that use of UL2601 will be mandatory. Also, As of Jan 1 2005, all Listed, Classified and Recognized medical and dental products, where

RE: UL544 Leakage Limits Patient Equipment*

Hi, Its been a while since I looked at UL 544, but a few comments. 1. Headphones are an applied part (UL2601-1) or patient connection (UL544). They come into direct contact with the patient. You can argue that they are an ordinary patient connection (Clause 2.18 of UL544). But, it is

Re: UL544 Leakage Limits Patient Equipment*

Yes, I also belive that your equipment has no patient leads and that the enclosure leakage was performed as part of the power supply. If in doubt regarding the enclosure leakage, best is to ask the power supply manufacturer for a complete report. Why are you using UL544 power supply? This