Mc Cable Support Above Ceiling

My co worker and i both understand that you cannot support mc with batwings to the ceiling grid wire.

Mc cable support above ceiling.

It has long been accepted as good practice to support cables above suspended ceilings. Yes cable ties are permitted. So we had a discussion at work today regarding support of 3 8 mc above a drop ceiling. Mc supports and suspended ceiling wires forgive me if this has already been addressed i searched for about 15 minutes and couldn t find a previous topic.

Section 330 30 a provides the general requirements and permits cable ties. Independent support wires are used they shall be distinguishable by color tagging or other effective means. We were using metal tie wire that comes in bundles but we stopped when questioned by the gc. This new 2017 code language also allows the electrician to install mc cable on the underside of floor and ceiling joists assuming the electrician supports the cable at every provided joist.

He said however that you can support it on the support wire holding the light fixtures up since it s part of the electrical system and not part of the grid. Are cable ties or ty raps allowed for supporting type mc cable in a ceiling. Section 330 30 requires mc cable to be fastened within 12 inches of each box and at 6 foot intervals. Section 348 30 requires fmc to be fastened within 12 inches of each box and at 4 5 foot intervals.

The ceiling support system shall be permitted to support branch circuit wiring and associated equipment where installed in accordance with the ceiling system manufacturer s instructions. General consensus is that you shouldn t support mc cable from suspended ceiling wires yet i d venture a guess anyone of us who said we ve never done that might be lying but i can t find it. Type mc cable can be unsupported where the cable is. The two main reasons for this are electrical safety and fire safety.

This is also new for 2017 as permission for this method of installation did not exist prior to the 2017 code cycle. 1 fished through concealed spaces in finished buildings or structures where support is impracticable or 2 not more than 6 ft long from the last point of cable support to the point of connection to luminaires or other electrical equipment within an accessible ceiling. Section 358 30 requires emt to be fastened within 3 feet of each box and at 10 foot intervals.