Nkọwa dị mkpirikpi:

Igwe ikuku nke abụọ nke transformer na-enye ike na usoro ọrụ eletrik

ma ọ bụ ngwaọrụ nchedo metering nwere ngwaọrụ nchedo fuse na oghere nkwụnye eriri; Nke

nha na udi nke oghere casing kwekọrọ na ọkọlọtọ America IEEE Std 386. The

Ọkọlọtọ elu voltaji dị elu nke oghere casing bụ mkpuchi zuru oke, kpuchie ya, ma mechie ya kpamkpam