The potential dangers of mixing devices/components of one manufacturer with the system infrastructure of another manufacturer have been highlighted by BEAMA. Selections should only be made based on the assembly/system manufacturer’s advice.

Recent incidents have highlighted a misunderstanding and potential dangers of mixing devices/components of one manufacturer with the system infrastructure of another manufacturer.

The most common example of this practice is when an installer tries to fit MCBs from manufacturer ‘A’ into the consumer unit of manufacturer ‘B’. Assemblies such as consumer units, distribution boards and panel boards are tested with specific devices installed, invariably those of the same manufacturer. The testing and certification for the assembly (i.e. consumer unit plus devices) is undertaken to BS EN60439-3, formerly BS5486. Although devices may appear similar, their dimensions, technical performance and termination features are not necessarily compatible.

Assembly/system manufacturer’s instructions will always state quite clearly that their product is fully compliant when used in conjunction with their specified devices/components.

If the installer does decide to mix components and assemblies, he/she should be aware that any testing, certification and warranty originally supplied by the manufacturer will be invalidated, and that the installer is responsible for testing and conformity with BSEN 60439, and is also accountable under health & safety regulation in the event of damage.

This issue applies also to cable tray systems and flexible conduit/fittings.

Distributors and wholesalers also have a responsibility under the General Product Safety Regulations to act ‘with due care’. They should be able to substantiate any advice related to interchangeability of devices/components in assemblies/systems. If the installer acts on a distributor’s advice, and in so doing produces a non-compliant assembly, then both the distributor and installer may be liable for any resulting consequences.

The only safe way to guarantee compliance, retain warranties and access support services is to select based on the assembly / system manufacturer’s advice, says BEAMA.