Saxanka rasaastu wuxuu u baahan yahay inuu ahaado 4 ilaa 5 mm qaro weyn si uu uga ilaaliyo shucaaca.Qaybta ugu muhiimsan ee saxanka rasaasta waa rasaasta, saamigeedu waa culus yahay, cufnaanta ayaa sarreeya;Saxanka rasaasta rasaasta waa nooc saxan ah oo lagu sameeyo mashiinka rasaasta rasaasta ee birta dhalaalaysa ka dib.Waxay leedahay hawlaha ilaalinta shucaaca, ilaalinta daxalka, caabbinta aashitada iyo ka hortagga raajada iyo dhexgalka kale ee raajo.Waqtigan xaadirka ah dhumucda saxanka macdanta "lead" ee caadiga ah waa 1 ilaa 10 millimitir, saxanka rasaasta ee loo isticmaalo ilaalinta iftiinka farsamo ahaan, dhumucdiisuna waxay caadi ahaan tahay 4 ilaa 5 milimitir bidix iyo dhinaca midig waxay si wax ku ool ah uga hortagi kartaa shucaaca.

Cadaadiska sare ee Ray 75kV, dhumucdiisuna tahay saxanka sunta rasaasta ≥1mm;Xadhkaha sare ee shucaaca waa 100kV, dhumucda saxanka rasaasta ilaalintuna waa ≥1.5mm;

Ray danab sare 150kV, dhumucdiisuna saxan macdanta hogaanka ilaalinta ≥2.5mm;Ray danab sare 200kV, dhumucdiisuna saxan macdanta hogaanka ilaalinta ≥4mm;

Ray danab sare 250kV, dhumucdiisuna waxay saxan hogaanka ≥6mm;Ray danab sare 300kV, dhumucdiisuna saxan macdanta hogaanka ilaalinta ≥9mm;

Ray danab sare 350kV, dhumucdiisuna saxan macdanta ledhka ≥12mm;Ray danab sare 400kV, dhumucdiisuna waxay saxan hogaanka ≥15mm.