Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <CTCDW-at-aol-dot-com> For a distribution transformer, you don't really need the R/C protection as the delicate NST's need. Just a safety gap on the transformer to prevent overvoltage. Wouldn't hurt to use one, just not really necessary IMO. Besides, you will lose a bit of power in the resistors. Chris W