Hello Arjen:
The definitions for Class 2 and Class 3 circuits may be
found in the USA National Electrical Code, NFPA 70:
Article 725-2 Definitions.
Article 725-41(a) Power sources for Class 2 and
Class 3 circuits.
Figure 725.41 Class 2 and Class 3 circuits.
Tables 11(a) Class 2 and Class 3 Alternating-
current power source limitations.
Tables 11(b) Class 2 and Class 3 Direct-current
power source limitations.
The index has an entry for:
Energy-limited, Class 2 and Class 3 control and signal
circuits [Article 725-41].
I cannot find any other mention of either Limited Energy
or Energy-Limited that apply to Class 2 and Class 3 circuits.
Article 725-41(a)(4) references UL 1950. The specific
reference would be Sub-clause 2.11, Limited Power Sources.
I suspect this may answer your question as worded, but I
suspect it does not answer what you want to know. If you
will be more specific, I will try to answer your question.
Best wishes for the holiday season,
Rich
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