only accredited companies to officially install to the standard as the system would need to be certified by the relevant company to confirm that the system meets the relevant standards
this should be detailed in the system Design Proposal and also what Grade the system would be and where applicable what grade signaling would be installed would be
i am not saying other people can not install to the standard but unless you are accredited you can not certify. there are point within the standard that stipulate the installation ie External Sounder (Bell Box) should be fixed using 2" 10 screws among other things