Kubuda kwemvura pasi imvura inosvika pasi nenzira isina kurongerwa. Kune mapoka maviri: kubuda kwemvura pasi kusingarongerwa kunokonzerwa nekuvharwa kwemidziyo kana kutadza kwemidziyo uye kubuda kwemvura pasi nemaune kunokonzerwa nemagadzirirwo akaitwa michina. Kubuda kwemvura "muchigadzirwa" kunogona kuita sekusinganzwisisike, asi dzimwe nguva hazvidzivisiki - semuenzaniso, michina yeIT inowanzoburitsa mvura kunyangwe iri kushanda nemazvo.
Pasinei nekuti kubuda kwemvura kwabva kupi, kunofanira kudzivirirwa kuti kusakonzere kuvhunduka kwemagetsi. Izvi zvinowanzoitwa nekushandisa RCD (leakage protection device) kana RCBO (leakage circuit breaker ine overcurrent protection). Vanoyera current iri mu line conductor voienzanisa ne current iri mu neutral conductor. Kana musiyano wacho ukadarika mA rating yeRCD kana RCBO, inogumburwa.
Kazhinji, kubuda kwemvura kunoshanda sezvaitarisirwa, asi dzimwe nguva RCD kana RCBO zvinoramba zvichidonha pasina chikonzero - iyi "rwendo runonetsa". Nzira yakanakisa yekugadzirisa dambudziko iri ndeyekushandisa mita yekuyera mvura inodonha, yakaita seMegger DCM305E. Izvi zvinosungirirwa patambo neconductor isina kusimba (asi kwete conductor inodzivirira!), uye inoyera simba rekudonha kwemvura pasi.
Kuti muone kuti dunhu ripi rakakonzera kudonha kwenhema, dzimai maMCB ese ari muchikamu chinoshandisa simba moisa chibatiso chekudonha kwepasi chakatenderedza tambo yemagetsi. Batidzai dunhu rega rega richitevedzana. Kana zvikakonzera kuwedzera kukuru kwekudonha kwemvura, izvi zvingangove dunhu rine dambudziko. Danho rinotevera nderekuona kana kudonha kwemvura kwaive kwemaune. Kana zvakadaro, imwe nzira yekupararira kwemutoro kana kupatsanurwa kwedunhu inodiwa. Kana kuri kudonha kwemvura kusingatarisirwi—mugumisiro wekukundikana—kukundikana kunofanira kuwanikwa uye kugadziriswa.
Musakanganwa kuti dambudziko ringave riri reRCD kana RCBO isina kunaka. Kuti muone, itai bvunzo yeRCD ramp. Kana mudziyo we30 mA - chiyero chinowanzoonekwa - unofanira kudonha pakati pe24 ne28 mA. Kana ukadonha nemagetsi akaderera, ungangoda kutsiviwa.