Ukuba ukwimarike yoguqulo lwamandla, izitishi ezixineneyo kunye nee-switchgears, mhlawumbi unombuzo malunga nokuba ungazithenga phi. Ukusuka kwi-transformer umzi-mveliso or jikelele trade inkampani, inokukuzisela ukuthandabuza. Ukuba uthenge iimveliso kumzi-mveliso waseTshayina we-transformer, unokufumana ixabiso eliphantsi, kodwa ishishini lisenokungabi lula kakhulu okanye lisebenze kakuhle. Ukuba uthenge iimveliso kwinkampani yorhwebo yehlabathi, unokufumana ukukhululeka kweshishini lehlabathi, kodwa ixabiso mhlawumbi liphezulu kakhulu.

Ukukunceda ukusombulula le ngxaki, i-SPL ibonakala yenza ixabiso elifanelekileyo kunye nokukhululeka kweshishini lokuthumela ngaphandle linokwenzeka ngaxeshanye. I-SMTB, njengefektri ye-SPL, inokuqinisekisa umgangatho ophezulu kunye nexabiso elifanelekileyo labaguquli bamandla, izitishi ezihlangeneyo kunye nezixhobo zokutshintsha. I-SPEEDLINK, njenge-arhente yorhwebo yehlabathi ye-SPL, inokubonelela ngazo zonke izisombululo kwinkqubela phambili yokuthunyelwa kwemveliso.