Laika pa-hkap la ai hte rubber-plastic-hkap la ai cable ni hpe makawp maga ai chyam dinglik ai lam hta, madung hku nna gaw, n-gun hpe ninghkap lu ai hte hkam sharang lu ai voltage chyam dinglik ai lam ni hpe sha galaw ai.
Cable insulation hpe ninghkap ai lam hpe chyam yu ai shaloi, lawu na lam ni hpe sadi ra ai:
1) Insulation n-gun hpe shadawn ai ladat gaw, galu kaba ai cable ni a matu htuk manu ai. Megohmmeter hpe madung hku nna hka htung n-gun hpe shadawn nna sawn la na matu lang ma ai. Ndai zawn re ai chyam dinglik masa hta, cable insulation kaja wa yang, absorption ratio grau law wa na re.
2) Cable insulation hpe ninghkap ai manu ni a matu, madung hku nna, masat da ai tara ni n nga ai. Cable langai a insulation masa hpe shawng na record ni hte shingdaw nna chye lu na re. Hpa majaw nga yang, nbung katsi ai lam gaw cable langai a insulation resistance hpe hkra machyi shangun ai majaw, shingdaw yu na matu cable insulation chyam dinglik ai shaloi nbung katsi ai hte nbung katsi ai zawn re ai nbung masa ni hpe ka matsing da ra ai.
3) Megohmmeter hpe lang na: 1 kV npu na n-gun rawng ai cable ni a matu 500-1000 V megohmmeter hpe lang na; kV hte dai hta jan ai n-gun rawng ai cable ni a matu 1000-2500 V megohmmeter hpe lang u.
4) Chyam dinglik ai lam garai n galaw shi yang, cable hpe hkum tsup hkra shapraw kau nna, conductive core hte cable a magri shingnip hpe ground galaw nna ground galaw ra ai.
5) N chyam yu shi yang, cable terminal sleeve a ntsa hpe jasan jaseng nna, ntsa kaw na hka n pru hkra galaw ra ai. Kaga n-gun n rawng ai cable core hpe shingnip shingna hku lang u. Ndai n-gun n rawng ai core a lahkawng maga na conductor ni hpe n-gun rawng ai core a sleeve (sh) insulation hte n-gun rawng ai magri wire hte matut nna, megohmmeter a shield terminal ni hte n matut shi yang, kalang lang shinggrup da u.
6) Insulation ninghkap ai lam hpe shadawn ngut ai hpang, cable hpe discharge galaw nna ground galaw ra ai. Cable galu wa yang, insulation masa grau kaja wa na re. Grounding aten gaw grau galu ra ai, madung hku nna n yawm htum minit mi daram rai ra ai.
DC resistand voltage chyam dinglik ai lam gaw cable project hpe ap ya ai (sh) makawp maga ai chyam dinglik ai lam a matu madung chyam dinglik ai lam rai nna, cable line langai hpe bungli galaw na matu htuk manu ai kun ngu ai hpe chye na lu na matu mung madung madung chyam dinglik ai lam rai nga ai. Operating cable ni hpe DC hkam sharang lu ai voltage hpe ayan chyam yu ra ai, leakage current hpe mung shadawn ra ai.
