1. Kev siv cov raj xaim tuaj yeem ua rau kev lag luam yooj yim thiab yooj yim cables xws li stainless hlau central tube fiber optic pab kiag li lawm los yog hlau strands. Cov xaim ntawm lub raj strand yog tso tawm los ntawm lub puab hlau thav duab, yog li cov strand ntawm cov hlau tseem siv txoj kev stranding ntawm lub raj zoo tib yam. Cov tub ntxhais hlau raug xa tawm los ntawm cov tub ntxhais hlau sab nraud thiab yuav tsis tig raws li qhov kev txiav txim, yog li cov tub ntxhais hlau tsis tshua khoov thiab hnav, thiab cov tub ntxhais hlau xaim ncaj nraim. Tiv thaiv kev sib tw ntawm cov tub ntxhais hlau.
2. Txhawm rau kom tsis txhob muaj kev sib cuag ua ntej cov tub ntxhais hlau thiab cov hlau hlau yog kinked, Guanci hla cov hlau xaim los ntawm kink ntawm sab ntawm cov tub ntxhais hlau ncej. Uas yog hais tias, nws tag nrho ua ke cov yam ntxwv ntawm lub raj thiab lub hneev strand, thiab muaj peev xwm tiv taus kev siv nyiaj txiag thiab tswv yim raj strands rau twist cables xws li stainless hlau central tube fiber optic pab kiag li lawm los yog steel strands.