UL Standards free download UL 697-2021 pdf download – Toy Transformers UL 697-2021 pdf download - Toy Transformers. 48 Details 48.1 Each transformer, as a routine factory test, shall be capable of withstanding without breakdown for 1 minute a 60 Hz essentially sinusoidal potential of: a) 1000 Vapplied... 02-11 Download Now