To save some transformer capacity, it may be possible to obtain a 208—120/240V 1ø drytype, connected in a split autotransformer configuration.
www.acmepowerdist.com/pdf/Page%2055-63.pdf
PRIMARY: 208 SECONDARY: 120/240 TAPS: 2, 5% BNFC

480V discharge fixtures should operate acceptably down to about 440V, although cold weather or motor starts on the 208V system my complicate this. If nonimal 208V runs low, moving the transformer connection from H4 to H3 will increase output voltage. {Its normal for 150°C-rise drytypes to run very hot—they should always be mounted in an area with adequate ventilation and clearances as labeled.}

[Linked Image from 6l6.net]




[This message has been edited by Bjarney (edited 01-22-2005).]