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 currently
intended for professional healthcare environments and has a metal tank that is
treated as an applied part. A three-prong power cord is used to provide a
protective earth connection as a MOP which, as I understand it, is not
allowable per clause 6 of 60601-1-11 ("shall be class II or internally powered"
and "shall not have a functional earth terminal").
The sales and marketing folks do not want to switch to a two-prong cord out of
concern that it will look unprofessional when used in a professional healthcare
environment, regardless of the fact that it will be redesigned to be double
insulated through other MOP's. In trying to respond to them a coworker and I
are in disagreement about how to interpret clause 6 and could use some help.
Does this mean that :
1. The power cord must be two prong, or
2. The power cord can be three prong but can have the earth terminal not
connected internally
If it were to not be connected internally, I assume that a C18 connector on the
device (while still using the three-prong cord) would be the correct path,
however I interpret this to mean option 1 is correct.
Which leads to the second related part of my question:
I am unclear on the differences between a functional earth terminal and a
protective earth terminal. After looking at Figure 2 in 60601-1, in this
particular application it doesn't seem like there would be a difference between
the two since it uses only mains power. Is this correct and can someone help me
understand what the difference would be between the two, especially as it
relates to home use?
Thank you,
Matthew Varas
Electrical Engineer
WR MEDICAL ELECTRONICS CO.
direct 651.604.8473 | cell 763.222.6900
email [email protected]<mailto:[email protected]>
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