No longer true ,you have to hold a 2377 certificate , Portable appliance testing now includes fixed appliances there for you need to be qualified to disconnect and reconnect the appliance ,
What drivel. Care to point us towards where you picked that little gem up?
It may be a requirement from certain employers or insurance companies, but no more than that.
And in any case, passing C&G 2377 will not qualify anyone as competent to perform safe isolation, disconnection and re-connection of fixed appliances.