1. Introduction of the IEC 60335-2-75 Modification Proposal 61/5925/INF
61(Shanghai/CHNC)66
Introduction of the IEC Modification Proposal 61/5925/INF
Fabian Dietschi CH-NC Delegation
IEC General Meeting 25. October 2019 Shanghai, China

2. Current Solution’s Problems
Target Appliance: Commercial Coffee Makers
Current Solution’s Problems
Increasing quality demands
More efficient and sustainable system
Reduction in wasted resources
Reduction of machine maintenance
Nicht wir sondern die technologie

3. - + 1 Electrodes Current Liquid flow 3 2 1
Proposed Technology: Ohmic Heating + - 1
Electrodes
Current
Liquid flow 3 2 1

4. + - Proposed Technology: Ohmic Heating Safety Improvements
Electrically equivalent to
a “Bare-Heating Element”1 + 1
Electrodes
Current
Liquid flow 3 2 - 1
Safety Improvements
Intrinsically safe against overheating
No residual heat stored in the heating element
No heating element that can break
Nicht wir sondern die technologie
[1] C. Amatore, “Fundamental principles of electrochemical ohmic heating of solutions,” Journal of Electroanalytical Chemistry, vol. 457, no. 1-2, pp. 191–203, 1998.

5. Appliances Allowing Electrodes or Similar
Current Standard
IEC cl “Electrodes shall not be used for heating liquids.”
AG28 Feedback
Food safety is not of concern
Potential exposure of electrodes to the operator during cleaning
Historically, risks associated with live parts in contact with water
Appliances Allowing Electrodes or Similar
IEC Toilet appliances
IEC Instantaneous water heaters1
1 “Bare-heating elements” which are electrically equivalent to electrodes.

6. Potential Risks
Most concern as from AG28 feedback
Leakage Current

7. ~ Summary Proposal for 2-75 Based on 60335-2-35 Mains
Class I or III construction
Limit residual leakage current highest conductivity of the liquid
Direct Resistance Heating Unit
Electronics
Mains ~

8. (Basic Insulation + Protective Earthing)
Summary Proposal for 2-75 Based on
Direct Resistance Heating Unit
Class III or
Class I
(Basic Insulation + Protective Earthing)
Mains ~
Electrode type flow heaters can be constructed in a standardized way.

9. We are looking forward for your comments
We will hand in the proposal for voting at the next GM in 2020
Fabian Dietschi CH-NC Delegation
IEC General Meeting 25. October 2019 Shanghai, China