You will require this certificate if you are an employee (or member of a partnership or as a director of a company holding a Contractor Licence) that intends to carry out electrical wiring, plumbing, draining and / or gasfitting work under the general supervision of a holder of a qualified supervisor certificate or contractor licence.
Plumbing includes water plumbing, roof plumbing and works of sewerage. Water plumbing includes plumbing involved in a fire service such as a fire sprinkler system, urban irrigation, and water supply. Water supply includes any work on pipes and fitting in a building in which any part of a sewerage service is connected to a septic tank or effluent system.
Gasfitting includes work on a gas installation (other than an autogas installation) connected or intended to be connected to a compressed natural gas container.
LP gasfitting work is restricted to work on a gas installation designed to carry liquefied petroleum gas in vapour phase only at pressures not exceeding 150 kilopascals.