Cov kev cai tseem ceeb rau kev teeb tsa hauv av: xaiv txoj kev tsim nyog (ncaj- faus / conduit / trench-tunnel), faus qhov tob Ntau dua lossis sib npaug li 0.7 m (Ntau dua lossis sib npaug li 1 m rau thaj av), siv armored cables, xuab zeb txaj + tiv thaiv slabs, cim thiab txhim khu kev qha earthing. Ua raws li GB 50217 & GB 50168.
Main installation xaiv
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Direct-faus: Tsawg dua lossis sib npaug rau 6 cables, qis- qhov chaw khawb. Armored cable yuav tsum tau . 100 hli nplua xuab zeb saum toj & hauv qab cable, pob zeb npog slabs. Markers txhua 50-100 m, ntawm khoov, pob qij txha thiab lub tsev nkag.
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Conduit / duct bank: heavy-traffic, congested underground or explosive-hazard zones. Conduit inner diameter ≥1.5× cable OD. Add sleeves for road/railway crossings, extend ≥0.5 m past roadbed. Fit manholes for bends, branches and runs >100 m.
- Cable trench / qhov: siab -qhov ceev cable cheeb tsam. Pav qhuav puag, txheej txhawb nqa (sib cais fais fab & tswj cables). Parallel spacing Ntau dua lossis sib npaug li 1 m ntawm cov kav dej kub; dej thiab tiv thaiv -corrosion yuav tsum tau.
Ncaj nraim - faus cov kauj ruam tseem ceeb
- Txoj kev tshawb fawb & trenching: tshem tawm cov khib nyiab ntse, mos trench hauv qab, tsis txhob muaj corrosion / stray tam sim no / hnyav crushing.
- Cov txaj pw: Ntau dua lossis sib npaug ntawm 100 hli cov av mos / xuab zeb zoo.
- Txheej: armored cable (YJV22). Tsis muaj av dragging. Min dabtsi yog khoov vojvoog Ntau tshaj los yog sib npaug rau 12-15 × OD, tawm serpentine slack.
- Kev tiv thaiv: lwm qhov ntau dua lossis sib npaug ntawm 100 hli xuab zeb txheej + pob zeb pob zeb (50 hli overhang txhua sab); daim kab xev ceeb toom rau cov chaw hauv nroog.
- Backfill: txheej compact non{0}}corrosive av, tsis muaj pob zeb.
- Earthing & marking: armor ob leeg -kawg earthing Tsawg dua los yog sib npaug rau 10 Ω; cov cim ruaj khov ntawm cov pob qij txha, khoov thiab txhua 50-100 m ncaj khiav.
- Hla -txoj kev / kev tsheb ciav hlau: kev tiv thaiv conduit, conduit sab saum toj Zoo dua los yog sib npaug rau 1 m nyob rau hauv txoj kev nto, dej kawg - thaiv kev sib khi, Ntau dua los yog sib npaug rau 1 % txoj kab nqes dej.
Cov ntawv tseem ceeb
- Direct- faus yuav tsum siv armored cables; tsis yog - armoured cables muaj kev tiv thaiv tsis txaus.
- Qhov tob: Ntau dua lossis sib npaug li 0.7 m tsis yog- av khov, Ntau dua lossis sib npaug li 1 m ua liaj ua teb; nteg hauv qab Frost txheej hauv cov cheeb tsam txias.
- Khaws qhov tsawg kawg nkaus tshem tawm (Ntau dua lossis sib npaug li 0.3 m ntawm cov hauv paus hauv av); tsis txhob tso ncaj qha saum / hauv qab cov kav dej.
- Ua kom tiav zais - ua haujlwm tshuaj xyuas ua ntej rov qab sau.
- Tsim thiab nthuav qhia ib GB 50217 thiab GB 50168; tsis muaj kev tsim kho yam tsis muaj txoj cai.
