Sec. 27. Same—Selling unapproved appliances, etc.
Every person, firm or corporation, before selling, offering for
sale, or exposing for sale at retail, any electrical material, device
or equipment shall first determine if such electrical material, device
or equipment complies with the provisions of this chapter and
is approved for sale, installation and use in the city; and it shall
be unlawful for any person, firm or corporation, or any principal,
agent or employee thereof, to sell, offer for sale, or expose for
sale at retail any such electrical material, device or equipment
which is not approved for sale, installation and use in the city.