How can large systems be declared compliant?

A large installation supplied by a single manufacturer may be considered a system and comes within the scope of the directive. For emission, EN 55011 allows on site testing for products within its scope, but an attempt to create a more general in situ measurement standard in Europe has failed. ETS 300 127 also addresses the issue for large telecommunications equipment but this is not harmonized. Neither standard addresses immunity. Such systems could be declared compliant via the Technical Construction File Route.