Gali būti atliekama dviem būdais: spindulinis kontūras (kai nuo maitinimo šaltinio atvedamas kabelis tiesiai į rozetę ir čia baigiasi), žiedinis kontūras (kai kabelis nuosekliai vedamas nuo vienos rozetės prie kitos, kol galiausiai prieinama prie paskutinės ).
Žiedinis kontūras
Tai labiausiai paplitęs instaliacijos būdas. 2,5 mm2 skersmens trijų gyslų kabelis vedamas nuo maitinimo šaltinio prie artimiausios rozetės, nuo jos einama tolyn prie kitos, kol prieinama prie paskutinės rozetės. Tada kabelis nuo paskutinės rozetės atvedamas atgal prie maitinimo šaltinio, kur pajungiamas į tuos pačius kontaktus (kaip ir pradžios kabelis).
Tai gali pasirodyti keista, tačiau taip užtikrinamas mažesnis kabelių apkrovimas – mažesnė rizika, kad kabelis kur nors ims kaisti, kai įjungiami didesnės galios prietaisai. Jei vienas toks kontūras skirtas visam aukštui, paprastai jame įjungiamas 30 amp automatinis saugiklis. Jei daugiau – priklausomai nuo apskaičiuojamos galios. Rozetėse paprastai būna po du kontaktus L, N ir įžeminimo. Pajungimas paprastas: ateinančio ir išeinančio kabelio fazinis laidas jungiamas į L kontaktus, nulinis - į N kontaktus, įžeminimo - į tam skirtus kontaktus.Vienas 2,5 mm2 skersmens kabelis gali aprūpinti elektra maždaug 100 m2 grindų ploto patalpas, neviršijant 68 m ilgio, su prielaida, kad kabelių aplinkos temperatūra neviršys 30 laipsnių, kabeliai nebus susukti į gumulą ir nebus įvynioti į vatą. Rozečių skaičius faktiškai neturi reikšmės.
Lauko ar padidintos rizikos patalpų (vonia, pirtis – arčiau vandens) rozetėms numatomi kontūrai turėtų būti jungiami per srovės nuotekio reles, o pačios rozetės (ir montavimo dėžutės – jei montuojamos ant paviršiaus) – specialios (su dangteliu, apsaugotos nuo vandens poveikio).
Papildomos rozetės įjungimas į kontūrą
Papildoma rozetė gali būti jungiama dviem būdais – nuo bet kurios rozetės, jau esančios kontūre arba nuo paskirstymo dėžutė. Pagrindinė taisyklė – rozetėje ar paskirstymo dėžutėje negali būti daugiau nei du kabeliai (ateinantis ir išeinantis), t.y. – negali būti pajungta kitų papildomų rozečių. Taip pat, jei kontūre naudojamas aliuminio laidas (sena instaliacija), jungti papildomą rozetę naudojant varinį kabelį – negerai (skirtingos laidų varžos, gali imti kaisti kabelis). Reikia arba pakeisti visą instaliaciją, arba papildomai atšakai taip pat naudoti aliuminio kabelį.
Spindulinis kontūras
Tokio tipo instaliacija – nuo maitinimo šaltinio atvedamas kabelis iki rozetės, iš čia – tolyn iki kitos rozetės ir taip toliau, kol prieinama iki paskutinio taško. Nuo paskutinio taško negrįžtama atgal į maitinimo šaltinį. Nėra jokio apribojimo dėl rozečių skaičiaus tokiame kontūre, papildomos rozetės (kontūro atšakos) gali būti prijungiamos vėliau (prisilaikant reikalavimų). Naudojamas kabelio tipas priklauso nuo paskirties.
Didelės galios prietaisai (tokie kaip orkaitė, skalbimo mašina, šildytuvai ir pan.) dažniausiai turi savo atskirus kontūrus: kabelio tipą ir skersmenį reikia parinkti atsižvelgiant į numatomo naudoti prietaiso technines charakteristikas ir bendrus reikalavimus.
Bendri reikalavimai yra šie: 20 m2 grindų ploto patalpoms naudojamas 2,5 mm2 skersmens kabelis, jungiamas per 20 amp automatinį saugiklį (prielaida, kad kabelių aplinkos temperatūra neviršys 30 laipsnių, kabeliai nebus susukti į gumulą ir nebus įvynioti į vatą), kabelio ilgis – iki 37 m. 50 m2 ploto patalpai naudojamas 4 mm2 skersmens kabelis, pajungiamas per 30 amp automatinį saugiklį.
Lauko ar padidintos rizikos patalpų (vonia, pirtis – arčiau vandens) rozetėms numatomi kontūrai turėtų būti jungiami per srovės nuotekio reles, o pačios rozetės (ir montavimo dėžutės – jei montuojamos ant paviršiaus) – specialios (su dangteliu, apsaugotos nuo vandens poveikio).
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