Plaster ring extension install#
Plaster ring extension code#

There's many ways that engineering services are bought and one condition was stated by the OP! Support wire(s) used for enclosure support shall be fastened at each end so as to be taut within the ceiling cavity. The enclosure shall be secured, using methods identified for the purpose, to ceiling support wire(s), including any additional support wire(s) installed for that purpose. The installation shall comply with the provisions of 300.11(A). The framing members shall be adequately supported and securely fastened to each other and to the building structure. An enclosure shall be fastened to the framing members by mechanical means such as bolts, screws, or rivets, or by the use of clips or other securing means identified for use with the type of ceiling framing member(s) and enclosure(s) employed. An enclosure mounted to structural or supporting elements of a suspended ceiling shall be not more than 1650 cm3 (100 in.3) in size and shall be securely fastened in place in accordance with either (D)(1) or (D)(2). In walls and ceilings constructed of wood or other combustible surface material, boxes, plaster rings, extension rings, or listed extenders shall be flush with the finished surface or project therefrom. In walls or ceilings with a surface of concrete, tile, gypsum, plaster, or other noncombustible material, boxes employing a flush-type cover or faceplate shall be installed so that the front edge of the box, plaster ring, extension ring, or listed extender will not be set back of the finished surface more than 6 mm (? in.). My guess is the 'electrician' will say, 'We've always done it this way before.'

Plaster ring extension code#

What 300.11 isn't telling me, and I can't find the reference for, is that I can't Sandwich the ceiling tile between the junction box and the smoke detector rrect? What's the code reference? If I'm interpreting 300.11 incorrectly, or should be referencing some other section of the code please let me know.

Plaster ring extension install#

Cables and raceways shall not be supported by ceiling gridsTo my mind, this means that if I install a smoke detector on a suspended ceiling I must:ġ - Use a 'T-Bar' hanger to span between the grid.Ģ - Attach the junction box to the 'T-Bar' hanger.ģ - Run a support wire from the junction box to the structure above the ceiling tile. Where independent support wires are used, they shall be secured at both ends. Support wires and associated fittings that provide secure support and that are installed in addition to the ceiling grid support wires shall be permitted as the sole support. Support wires that do not provide secure support shall not be permitted as the sole support.

Raceways, cable assemblies, boxes cabinets, and fittings shall be securely fastened in place.