99NEC Article 321 — Messenger Supported Wiring 321-1. …exposed wiring… to support insulated conductors by…: (2) A messenger with a field-installed lashing material for conductor support.
Not aware of 4-insulated-conductor construction, but based on referenced text, it may be possible to make or modify existing product [like original ‘quadruplex.’] Custom made in suitable quantities through a wire house may be cost effective.
hmmmm, ok thanks, BTW,we have a Belden co up here, probably a good place to ask.
The concern was to address an overhead feeder to a poolhouse, for a pool. As i've talked the customer into a UG feeder this now becomes hypothetical, yet somewaht a 680 qaugmire.....