R29:58.

No engineer in the employ of equipment or material supply companies will tender designs, plans, specifications, advice or consultation to operations beyond the limits of a machine or item of material or supply, except as is required for proper functioning of the particular item.

Code is relevant when:

Engineer is employed by an equipment or material supplier
AND
Engineer tenders designs, plans, specifications, advice or consultation to a client

Code is violated when:

The designs, plans, specifications, advice, or consultation is beyond the limits of a machine, item of material, or supply
AND
The designs, plans, specifications, advice, or consultation is not required for proper functioning of the particular item

Code is not violated when:

The designs, plans, specifications, advice, or consultation is not beyond the limits of a machine, item of material, or supply
OR
The designs, plans, specifications, advice, or consultation is required for proper functioning of the particular item