There was a recent article in Fine Homebuilding regard wiring a load center
in which the author used wire ties to organize circuits.
Naturally this generated discussion as to whether this was bundling. The
author replied it wasn't and no inspector ever dinged him for it.
Bundled does not become a problem until you have 24" bundled together.
Unfortunately some inspectors may try to add up all the bundles.
The place where this bites a lot of installers is where Romex goes
through the top plate and it gets foamed in. 334.80 says where more
than 2 NM cables go through foam, it must be derated (no minimum
distance) so if you have more than 9 total #14 or #12 current carrying
conductors in that bundle you have exceeded the 90c rating. It is best
to only run one other cable through a hole with a #10 since the 90c
rating is only 40 and you get there pretty quickly.
Yes it is not uncommon. In fact it is almost implied in the change to
200.4 in the 2011 cycle
(D) Grouping. The ungrounded and grounded circuit conductors
of each multiwire branch circuit shall be grouped
by cable ties or similar means in at least one location within
the panelboard or other point of origination.
Exception: The requirement for grouping shall not apply if
the circuit enters from a cable or raceway unique to the
circuit that makes the grouping obvious.
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