you don't. You only declare performance of your own work. If erector welds, bolts, ... and such, either:
- he does not have work in a workplace, and thus does not fall under the CPR
- prepares his work in a workshop, needs his own EN1090 certification, and has to draw a DoP for his interventions.
today I read my old comment of yesterday, and I was wrong in his second part, so I must correct part of what I said. In the middle of the beam of course the Nc is maximum but the shear strenght is zero. So I correct my mistake of yesterday: the correct is that in the middle of the beams we don't have any shear strenght. But the two critical sections are in this case the support (where is the maximum shear) and the middle of the beam (where is the maximum bending moment), so " at intermediate points approximately mid-way between adjacent critical cross-sections " means approximately at L/4 of the beam, where the shear strenght is still not zero. And there we have to do the check, calculating with the elastic solution the number of the connectors and comparating this number with the number of constantly-spacied connectors, in a certain lenght for example 50 cm.