circuit main

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1. In an air-conditioning system, a major duct or pipe for distributing to or collecting from various branches.
2. In any system of continuous piping, the principal artery of the system to which branches may be connected.
References in periodicals archive ?
The Danish stockbroker is no stranger to winning at a WSOP Circuit main event, after placing second in Atlantic City back in February.
We are continuing to see players favoring the WPT's big buy- in events over the World Series Circuit Main events -- as we continue to see slower than expected growth from the young WSOP Circuit.
Tenders are invited for Supply, storage, installation, testing, commissioning and handing over of electrical installation works like ht ring main unit, ht metering cubicle, 11kv ht switchboard, transformer, cables, sub mains, circuit mains, light points, wiring, power receptacles, light fixtures, lt panels, distribution boards, telephone/data/tv systems, earthing, elevators, etc.