Raws li cov lus qhia tshwj xeeb, galvanized cable tais yuav tsum tau ua kom zoo.
(1) Kev tiv thaiv tiv thaiv ntawm txhua qhov kho qhov ntsia hlau ntawm galvanized cable tais splice phaj
yuav tsum tsawg dua 0.005 Ω; Nyob rau hauv cov xwm txheej no, lub tais cable yuav ua haujlwm ua lub hauv paus hauv av (hmoov-cov hlua cable coated tsis haum rau kev siv hauv av). Tus nqi tsis kam ntawm txhua kab phaj kab tuaj yeem suav nrog siv cov qauv hauv qab no:
r = ρ·L/S
Qhov twg: ρ=15 × 10⁻⁶ Ω·cm (ntawm 20 degree);
L=ntev (xws li 100 mm);
S=hla - cheeb tsam (cm²).
(2) Saib Table 2 rau chav ntsuas qhov tseem ceeb ntawm tus ntaiv -hom thiab tais- hom kev txhawb nqa cable.
Table 2 Chav ntsuas qhov tseem ceeb rau tus ntaiv-hom thiab tais- hom kev txhawb nqa cable
(3) Saib Table 3 rau qhov ntsuas qhov ntsuas qhov ntsuas ntawm cable troughs.
(4) Thaum lub cable tais raug ntsia thiab txuas rau hauv ib qho kev sib koom ua ke, qhov kev tiv thaiv ntawm txhua sab kev tsheb nqaj hlau (los yog txhua seem cable trough) yog:
R = L(r + 1/3r')
Qhov twg:
R - Tag nrho cov tsis kam ntawm tag nrho ntev ntawm sab rail (los yog cable trough) (mΩ);
r - Resistance ib chav tsev ntev ntawm sab rail (mΩ / m)
