"Drip Loop" [Linked Image] The roof is not tight. [Linked Image]

If things go the way we would like, it goes like this.

We arrive on the job before any interior walls go up.

1)Mark on floor with spray paint all electrical circuits and locations, we have a color code that identifies what it is, power, lights, HVAC, FA etc.

2)Install every bit of cable attaching it as high as possible to trusses beams and decks, leaving a coil more than long enough to reach the boxes yet to be installed.

3)Walls get built, we install all boxes.

4)Now all our guys have to do is look up and drop the previously run MC down the wall and cut into the box. The slack is already "waste" no sense of putting it in the dumpster, we use what we need in the box and work the slack back into the ceiling leaving tie wrapped coils of slack almost every where.

These come in very handy when things need to get added, as in slack to cut in a J-box.

However the wall you are looking at has a large air duct right above it, no place to leave slack, resulting in the drip loop, if we need slack it will pull up through the cable supports.

Bob

Bob Badger
Construction & Maintenance Electrician
Massachusetts