Introduction

Much of the guidance in this document is given in terms of performance classifications in relation
to British or European Standards. In such cases, it will be necessary to demonstrate that a system
or product can meet the relevant performance classification. This will be achieved if the system or
product complies with one of the following.
a. They should be in accordance with a specification or design that has been shown by a specific
test to be capable of meeting that performance classification.
b. They should have been designed by using relevant design standards in order to meet that
performance classification.
c. They should have been assessed by applying relevant test evidence, in lieu of carrying out a
specific test, as being capable of meeting that performance classification.
NOTE: Some products are subject to Classification Without Further Testing (CWFT). For the purposes
of this approved document, such products can be considered to have been shown to be
able of meeting a performance specification as per paragraph B1a.