Rimmed rib on perforated cable tray

M

Thread Starter

Mahmoud

we are using perforated cable trays for some instrument installation in SV PIT for transit pipe line. for cable trays work it's mention Rimmed Rib perforated cable trays. when i checked the cable trays i found it normal cable tray 100*100*3mm but what exactly "rimmed rib" means?
can any body clear for me this expression?
 
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