(a) Each service line connected to a cast iron or ductile iron main must be connected by a mechanical clamp, by drilling and tapping the main, or by another method meeting the requirements of section 255.273 of this Part.
(b) If a threaded tap is being inserted, the requirements of section 255.151(b)-(c) of this Part must also be met.
(c) Service line connections shall not be brazed directly to cast iron or ductile iron mains.
(d) Service lines must meet the electrical isolation requirements of section 255.467(b) of this Part.