A new facility with a large music rehearsal room that has a minimal electrics rig, 4 pipes 32' long, schedule 40 1.9 OD under an ETC raceway, the electrics span the short side (SL/SR) of the room. The 4 electrics are rigged to a Kindorf channel steel system that spans some of the US/DS length of the room, 5 - 3/8" threaded rods as hanger from each electric to Kindorf. Length of Kindorf structure is approx 45 ft.
The Kindorf is itself installed with each US/DS section using threaded rod to beam clamps onto steel above the finished ceiling. There a total of 5 rods per Kindorf length, 25 total threaded rod support points for the entire system. There is no lateral support to side walls of the electrics, they just gravity hang from the rod/Kindorf structure.
The lighting design from the early stages called for 30 S4 Pars as overhead washes, 6-8 per electric and that's what's installed. There are 6 circuits only per raceway (with add'l circuits on the side walls).
The only drawing we have, a blurry PDF, has the stamp of a structural engineer, but the drawing is NOT what was installed, as they realized during construction that the electrics were intended to rod hang direct from the lateral steel beams and could not, as the beams did not line up where the electrics needed to be, thus the rigging installer did the Kindorf structure. We do not have an as-built drawing, so no idea as to weight capacity nor information as to any sign off by an engineer.
The Dept. of Theater desires to strip the 30 S4 Pars and hang an LED rig for an event, approx. 20-23 Lustre II's on each electric . We have concerns about the weight capacity of the steel rod/Kindorf/beam clamp. We can calculate the 20 lbs per fixture with clamp, but are uncertain of the load limit of the grid.
We have a call out to the rigging installer, a nationally well known rigging installation company, as to 1) Are there as-built drawing ?, 2) Did a structural engineer sign off ?, 3) Do they have any thoughts on the load capacity of the rig ?.
But I thought I would run this past my colleagues at CB as to their thoughts.
The Kindorf is itself installed with each US/DS section using threaded rod to beam clamps onto steel above the finished ceiling. There a total of 5 rods per Kindorf length, 25 total threaded rod support points for the entire system. There is no lateral support to side walls of the electrics, they just gravity hang from the rod/Kindorf structure.
The lighting design from the early stages called for 30 S4 Pars as overhead washes, 6-8 per electric and that's what's installed. There are 6 circuits only per raceway (with add'l circuits on the side walls).
The only drawing we have, a blurry PDF, has the stamp of a structural engineer, but the drawing is NOT what was installed, as they realized during construction that the electrics were intended to rod hang direct from the lateral steel beams and could not, as the beams did not line up where the electrics needed to be, thus the rigging installer did the Kindorf structure. We do not have an as-built drawing, so no idea as to weight capacity nor information as to any sign off by an engineer.
The Dept. of Theater desires to strip the 30 S4 Pars and hang an LED rig for an event, approx. 20-23 Lustre II's on each electric . We have concerns about the weight capacity of the steel rod/Kindorf/beam clamp. We can calculate the 20 lbs per fixture with clamp, but are uncertain of the load limit of the grid.
We have a call out to the rigging installer, a nationally well known rigging installation company, as to 1) Are there as-built drawing ?, 2) Did a structural engineer sign off ?, 3) Do they have any thoughts on the load capacity of the rig ?.
But I thought I would run this past my colleagues at CB as to their thoughts.