Lesi siguquli siyi-epoxy resin evalwe ngesakhiwo esivaleke ngokuphelele kanye nokuvala okugcwele. Yakhelwe ukusetshenziswa ukulinganisa amandla kagesi, amandla kagesi kanye nokuvikela okudluliswayo kusistimu yamandla enefrikhwensi elinganiselwe engu-50Hz – 60Hz kanye ne-voltage elinganiselwe engu-3,6, 10 kV noma ngaphansi. Usayizi omncane, isisindo esilula singafakwa kunoma iyiphi indawo.