1) Ɛsɛ sɛ wɔyɛ nhama nhama a wɔde ahyɛ mu foforo no mu nhwehwɛmu a ɛkyerɛ sɛ wogye tom na wowie gye a wogye tom no ho nhyehyɛe ansa na wɔde adi dwuma.
2) Wɔ nhama a anyinam ahoɔden atwa bɛboro dapɛn biako nanso ennu ɔsram biako ho no, ɛsɛ sɛ wɔde megohmmeter susuw wɔn insulation resistance ansa na wɔasan de adi dwuma. Ɛnsɛ sɛ insulation resistance no so tew 30% sɛ wɔde toto sɔhwɛ kyerɛwtohɔ a atwam no ho (wɔ ɔhyew koro no ara mu). Sɛ ɛnte saa a, ɛsɛ sɛ wɔyɛ DC withstand voltage sɔhwɛ. Wɔ nhama a anyinam ahoɔden atwa bɛboro ɔsram biako nanso ennu afe biako ho no, ɛsɛ sɛ wɔyɛ DC ahoɔden a wɔde gyina ano ho sɔhwɛ wɔ ahoɔden a wɔde siw ano no fã.
3) Wɔ cables a ɛwɔ re-terminals, intermediate connectors, anaa intermediate connectors a wɔde ahyɛ mu foforɔ no, ɛsɛ sɛ wɔhwɛ phase gyinabea no, ɛsɛ sɛ wɔde megohmmeter susuw insulation resistance, na ɛsɛ sɛ wɔyɛ withstand voltage test. Bere a sɔhwɛ ahorow no nyinaa twam akyi nkutoo na wobetumi ama nhama no asan afi ase ayɛ adwuma.
