That part of a plumbing system that is so designed and installed as to serve more than one appliance, fixture, building, or system.
Related Code Sections
1315.7 Health Care Facilities and Medical Gas and Medical Vacuum Systems, Common Parts
The use of common parts in outlets/inlets, such as springs, O-rings, fasteners, seals, and shutoff poppets, shall be permitted. [NFPA 99:5.1.5.8] ...
(B) Wiring and Protection, Common Neutral
The ampacity of the neutral conductor shall not be less than the maximum net calculated load current between the neutral conductor and all ungrounded ...
(3) Wiring and Protection, Common Location
conductor shall be sized in accordance with 250.66 based on the service-entrance or feeder conductor(s) at the common location where the connection ...
610.15 Special Equipment, Common Return
Where a crane or hoist is operated by more than one motor, a common-return conductor of proper ampacity shall be permitted ...
(I) Communications Systems, Common Ground
A single bonding conductor or grounding electrode conductor shall be permitted for both protective and operating purposes ...