Yog, cov ntoo thaiv kab hluav taws xob tsim nyog los tsim cov laj kab hluav taws xob yooj yim, nws yooj yim heev rau ntswj cov ntoo ncej insulator rau hauv ntoo ncej, thiab tom qab ntawd thauj cov polywire, xaim mus rau ntoo ncej insulator, tsim lub hauv paus hauv av thiab txuas rau lub zog, lub laj kab hluav taws xob yooj yim tau npaj rau siv.

Rau ntoo ncej insulator, muaj 2 hom, Hom A thiab Hom C.
Hom A ntoo ncej insulator yog nrog cov tub ntxhais txhawb ncaj hauv. qhov no yog hom kev lag luam, qhov hnyav nyob ib puag ncig 18g.
Hom C ntoo ncej insulator yog nrog cov tub ntxhais txhawb nqa txuas ntxiv sab hauv. qhov no ruaj dua, qhov hnyav nyob ib puag ncig 25g.

Hom A Ntoo Post Insulator:

Hom C Ntoo Post Insulator: