http://www.armstrong.com/commclgeu/eu1/sr/me/glossary-edge-d...
Glavni nosač – Primarni noseći element potkonstrukcije koji se kači direktno za noseću konstrukciju.

http://encyclopedia2.thefreedictionary.com/main runner
main runner

Možda će vam ovo biti od pomoći u vezi podkonstrukcije:
http://www.notex.hr/img/armstrong.pdf
A large supporting runner for a suspended ceiling; a primary member of the suspension system; usually 1½-in. (3.8-cm) metal channels, held by hangers or rods from the building structure; used to support furring channels or rods to which lath is attached.

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Note added at 16 hrs (2012-03-18 10:46:55 GMT)
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Izvinite molim vas, pomešala sam linkove, definicija na engleskom jeziku je odavde:
http://encyclopedia2.thefreedictionary.com/main runner
main runner
A large supporting runner for a suspended ceiling; a primary member of the suspension system; usually 1½-in. (3.8-cm) metal channels, held by hangers or rods from the building structure; used to support furring channels or rods to which lath is attached.

a link (armstrong) sam vam poslala jer je terminologija vezana za potkonstrukciju na hrvatskom pa smatram da vam može biti od pomoći.