B
We are developing a 1kW power supply (PSU) for medical equipment. The PSU needs to be 60601-1 2012 certified.
Subclause 13.1.2 states that emission of flames, molten metal, poisonous or ignitable substance in hazardous quantities shall not occur in single fault conditions.
To prevent this from happening, we considered the following options:
Are we missing an option? Is our reasoning behind options 1 and 2 correct?
Subclause 13.1.2 states that emission of flames, molten metal, poisonous or ignitable substance in hazardous quantities shall not occur in single fault conditions.
To prevent this from happening, we considered the following options:
- We cannot use a fire enclosure. 60601-1 requires that the bottom of a fire enclosure cannot have holes. Our PSU can be used in any direction, so any side of the PSU can be the bottom. We need holes for several connectors (which don't cover the hole completely).
- Interpretation sheet 2 of the 60601-1 explaines that "Fire ENCLOSURES are intended to be used only where there is a significant likelihood of fire due to the presence of a source of ignition (as described in the subclause) and a significant source of fuel." We have several big 300uF 400V capacitors in our design. I think those are a great source of ignition and a great source of fuel.
- The PSU is placed in equipment. Using the equipment enclosure as fire enclosure is not allowed by the equipment manufacturer.
- We cannot test all single points of failure, because the number of SPFs is infinite.
Are we missing an option? Is our reasoning behind options 1 and 2 correct?