What is the recommended maximum period between inpections and testing for shower blocks, laundry rooms and communal washing facilities on campsite? The electric hook ups and the distribution wiring to them is yearly but there is no mention of other parts of the installation. The scope in Section 708 of BS7671 does not cover these buildings. Are these buildings defined as commercial (5 years) or due to the fact they are on a campsite part of a leisure complex (3 years)?