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UL Listed & Voltage-Radio characteristics?

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    UL Listed & Voltage-Radio characteristics?

    Not very famliar with all this NEC/OHSA/NRTL stuff, but I have read quite a lot, and still I can not find a satisfaying answer to this question.
    I understand some stuff round safety...In Brief...
    - NEC defines the rules for eletrical safety
    - OHSA order (and control) that NEC rules are applied in workplaces
    - In workplaces, UL Listed equipement shall be used to futfill OHSA requirement
    - In non workiplace location others (AHJ/inssurance/distributor) may require to use UL Listed equipement.
    - UL Listed in non workplaces is almost a marketing "nice to have".

    What I can't figure out, is When do I need by product to be UL -Listed
    - OHSA requires electrical conductors and equipment to be approuved : is electronic included within electrical?
    - do electrical stands for anything pluged in mains and connected to electrical distribution?
    - are battery powered products also considered?
    - is there a voltage limit? I saw 50V-5mA once.
    - Seems to me USB Mouse is not UL Listed, neither a Wireless mouse...
    - So what are the keypoints to know if you got to be UL Listed?
    - Connected to mains?
    - Voltage & Current ?
    - Use of radio function?
    - Use of battery?
    - Is that always up to the NRTL to decide wether your product presents some hazard and hence require to be listed?