Re: [PSES] Confusion about IEC 60601-1-11 Power Cord Requirements and Functional vs Protective Earth Terminals

A comment from my "impressions only" as to why the requirement exists: In many parts of the World, a majority of power outlets in household locations do not include a protective earth/ground contact - and thus any such connection in connected equipment might induce a false sense of "security"

Re: [PSES] Confusion about IEC 60601-1-11 Power Cord Requirements and Functional vs Protective Earth Terminals

Hi Matthew: According to IEC 60601-1 Sub-clause 6.2: ME EQUIPMENT energized from an external electrical power source shall be classified as CLASS I ME EQUIPMENT or CLASS II ME EQUIPMENT Its okay to have Class I equipment with Class II construction throughout. However, you are likely

Re: [PSES] Confusion about IEC 60601-1-11 Power Cord Requirements and Functional vs Protective Earth Terminals

Hi Matthew: In answer to your question how to distinguish between functional earth circuits and protective earth circuits: Protective earth (PE) circuit carries fault current to earth. Presumably, the fault current is from a mains-to-earth fault. Functional earth (FE) circuit

Re: [PSES] Assess risk of electric shock from charged capacitors

My point is there is something broken in the approval system if someone can arbitrarily exclude something like a zero or peak-crossing switch. Ken Javor Phone: (256) 650-5261 From: "doug...@gmail.com" Date: Tue, 18 Oct 2022 10:46:01 -0600 To: Ken Javor Cc: Subject: Re: [PSES] Assess risk of

[PSES] Confusion about IEC 60601-1-11 Power Cord Requirements and Functional vs Protective Earth Terminals

Hello, We are converting a product to comply with 60601-1-11 for home use and I was hoping to get some clarification on the power cord requirements. The device is a mains-powered heating tank which uses snap-action thermostats to control mains power through the internal heating pad. It is

Re: [PSES] Assess risk of electric shock from charged capacitors

As I mentioned, I agree. However, I am not the one who signs the certification, so I must use the guidance I receive. -Doug Douglas E Powell Laporte, Colorado USA doug...@gmail.com LinkedIn (UTC -06:00) Mountain Time (US-MDT) On Tue, Oct

Re: [PSES] Assess risk of electric shock from charged capacitors

The comparison is inaccurate and misleading. A measuring device must be suitable to the application, so recognized and calibrated and approved for use. A device that is a stimulus, or a means to a stimulus, whose proper operation is measured and verified by an accepted and calibrated device

Re: [PSES] Assess risk of electric shock from charged capacitors

Ken, I may be wrong but I believe the reluctance to accept in-house constructed circuits is similar to the low acceptance of digital meters for touch current measurements that we saw until the 1980s. Until True R.M.S. DVMs had a well established track record (e.g. Fluke 8060A), neither my LGA or