Wis. Admin. Code § PSC 135.279
After the text in 49 CFR 192.279, insert:
(1w) Copper pipe shall be joined by using either a compression type coupling or a brazed or soldered lap joint. The filler material used for brazing shall be a copper-phosphorous alloy or silver base alloy. Butt welds are not permissible for joining copper pipe or tubing.
History: Cr. Register, October, 1999, No. 526, eff. 11-1-99.