I get tenders through daily with weird shrimps on it, insisting on Grade 3 and but audible only, or quoting 4737 its why they specify that the installer must be accredited, its like heres something to make the client think we know what we are talking about, but you're the expert you tell us how it should be. Normally I quote exactly what they specify and then when I get the tender and get in front of the client I change it for what they need.
I have several architects that specify us as their preferred specialist because we dont make them look like ducks