Article 16 Bottled gas
A person is an exempt supplier when supplying premises with gas consisting wholly or mainly of propane or butane which is conveyed to those premises from transportable storage containers provided—
the gas conveyed to the premises is stored in no more than 4 transportable containers and each container contains no more than 47 kilograms of liquid consisting wholly or mainly of propane or butane;
where the gas is conveyed from more than 2 transportable containers an automatic device is used to ensure that the gas conveyed to the premises at any one time is restricted to gas drawn from not more than 2 of those containers; and
the aggregate length of pipe through which the gas is conveyed to the premises from any container does not exceed 3 metres measured from where the pipe leaves the storage container to where it enters the premises.
In this article any reference to premises is a reference to a single building or structure.