Qhov sib txawv tseem ceeb ntawm ob hom toroidal transformers yog qhov sib txawv ntawm kev tiv thaiv voltage thiab kub. Kev tiv thaiv hluav taws xob ntawm UL1015 hlau yog 600V, thiab qhov kub tsis kam yog 105 degrees; Lub zog tiv thaiv ntawm UL1007 hlau yog 300V, thiab qhov kub tsis kam yog 80 degrees; Tus neeg xyuas pib ntawm ob qho tib si yog tib yam, tab sis lub nominal rwb thaiv tsev thickness ntawm cov hlau thiab sab nraud txoj kab uas hla ntawm cov hlau yog txawv, uas yog, lub sab nraud txoj kab uas hla ntawm 1007 hlau yog nyias thiab lub sab nraud txoj kab uas hla ntawm 1015 hlau yog tuab.