States, counties and cities adopt NFPA-70, NEC, National Eclectic Code, as a
building and life safety requirement.
NFPA-70 requires electrical parts and all consumer goods to be listed and
labeled.  Listing is getting the certification from a nationally recognized
testing organization.  Labeling is the mark of that organization along with
the electrical specifications of the item shown on the item.  The big
organizations in North America are ETL, UL, CSA, and FM.
The mark on a product assures you and any safety inspector the product is
safe to use as defined in the products instructions if properly installed.
If you live where an electrical permit is required they will look for the
label.  With no permit and no inspection you are normally on you own if a
problem happens even if listed parts were used.
Even if everything is listed, was done to NFPS-70 code and was inspected
your insurance company could go after the equipment manufacturer.  That is
why the manufacturer gets 3rd party testing to prove their design is safe
and compliant and they were not negligent.
So why don't smaller manufactures get listed?  It is expensive and a lot of
work.  I was recently involved with getting an industrial device UL listed,
similar to a home EVSE.  Testing costs were $12K, it took 4 months and a lot
of extra documentation, they needed 5 sample units 4 were destroyed with
high voltage tests, they do 4 surprise product and component audits each
year, you must have a registered ISO quality system in place, annual costs
are $6K.  
David Kerzel
Modulaer EV Power LLC


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