Plumbing contractor means a licensed master plumber or a person who employs a licensed master plumber full-time to directly supervise the installation of plumbing as his or her representative engaged in the business of plumbing for a fixed sum, price, fee percentage, valuable consideration, or other compensation and who is licensed as a plumbing contractor.
Filter means material placed in the useful beam to preferentially absorb selected radiations.
Electrical contractor means an electrical contractor as defined in the Regulations;
Solid insulator means the insulating coating of wiring harnesses, provided in order to cover and prevent the high voltage live parts from any direct contact.
Tank means an enclosed space which is formed by the permanent structure of a ship and which is designed for the carriage of liquid in bulk.