York S1 025 15798 700 Transformer Els PW 29614 the distance is typically determined the distance is typically determined by the voltage drop across the 14 to 18 AWG field wiring Simplified Identification: Color coded red thermal switch housing prevents installation errors with lower temperature blue or yellow limit counterparts The 250VA power rating offers a robust safety margin for transformer voltage conversion in systems where standard 40VA or 75VA units would fail under inductive load you can safely use a higher 250VA rated transformer like the S1 025 15798 700 to replace a unit with a lower VA rating (such as 150VA)