I was thinking of the availability of the material. 250 is pretty common, & if the pulls are short there wouldn't be a considerable ammount of extra labor...as for the metering setup. The POCO here places the CT's right over the secondary spades in the Padmount, & I've changed out transformers before without involving the Metering Dept. You simply unbolt all of your paddles, and slide the CT's over the paddles, & down the conductor. Works great, & is really quick !