Metallic Outlet Boxes are Listed under the category Metallic Outlet Boxes (QCIT), in the UL Electrical Construction Equipment Directory. These outlet boxes are intended for installation in bearing and non-load bearing wood or steel stud gypsum wallboard walls with fire resistance ratings of 2 hours or less.
A. A fire-resistance rating refers to the period of time an assembly is able to contain a fire and perform its intended structural function. These ratings are determined by subjecting an assembly to a standard fire exposure as defined in ASTM E119.
Furthermore, what is a putty pad? Putty Pads are made from intumescent putty which is primarily used a firestopping product. Putty Pads are available as a 7″ x 7″ poly release faced pad for protection of recessed electrical boxes and as a through-penetration sealant.
Just so, where are putty pads required?
Putty pads, as mentioned above, are designed to be applied to the external surfaces of metallic and nonmetallic boxes. They are applied to the back surface of the box, as well as the three sides that are away from the stud. Openings for steel electrical boxes not exceeding 16 sq.
What is a 2 hour fire rated wall?
The 2–Hour Area Separation Wall System is a 2–hour fire wall consisting of 2 in. (50.8 mm) light-gauge steel H-Studs that secure two layers of 1 in. (25.4 mm) shaftliner panels friction-fit between studs and a minimum 3/4 in.
How thick is a 2 hour fire rated wall?
The fire-resistance rating of concrete masonry walls depends on the type of aggregate used in the units. A 2-hour rating can be achieved by a wall with an equivalent thickness of as little as 3 1/5 inches when expanded slag or pumice is used or 4 1/2 inches when siliceous gravel is used as the aggregate.
How do you get a 2 hour fire rated wall?
Use thicker drywall for a two-hour rating, if double-sheeting is not an option, with fire-resistant insulation between the wall studs. Cover wood-framed walls with a single layer of 3/4-inch Type X drywall rated for 120 minutes of fire resistance.
What is the fire rating of 5/8 drywall?
How do I know if my wall is fire rated?
The fire-resistance rating of exterior bearing walls shall comply with Table 601 or 602, whichever is greater. If the fire separation distance of the wall is greater than 5 feet, then the wall shall be rated against fire exposure from the interior side.
What is a 1 hour firewall?
According to the book “Commercial Drafting and Detailing,” a typical one-hour fire rated wall consists of 2×4 studs spaced 16 inches from the center of one stud to the center of the next, covered by 5/8-inch, type X gypsum board. Type X gypsum board is wallboard to which non-combustible fibers have been added.
What makes a fire rated wall?
A fire-rated wall is a feature of a building’s passive fire protection system that has been checked and certified by the proper regulatory agency. The first is a structurally stable wall that also is certified to prevent fire from spreading from one side of a building to the other.
What are fire ratings?
Bush Fire Danger Ratings are based on predicted conditions such as temperature, humidity, wind and the dryness of the landscape. The higher the fire danger rating, the more dangerous the conditions. Homes are not designed to withstand fires in catastrophic conditions so you should leave early.
What is fire caulk?
Firestopping is the use of building materials which prevent the spread of flames, heat or hot gases through penetrations in fire-rated walls, ceilings or floors for items such as pipes, ducts, conduits and cables. Fire Caulk: Fire caulk is designed to expand and fill that void of the melted pipe during a fire.
Are metal electrical boxes fire rated?
Listed metallic outlet boxes with metallic or nonmetallic cover plates may be used in fire-rated floor/ ceiling and roof/ceiling assemblies with ratings not exceeding two hours.
How do I install putty pads?
Installation Method: Remove poly liner from one side of pad. Align pad to the side of box partially overlapping the stud and adhere. If wall membrane is in place, pack putty into gaps between box and wallboard slightly overlapping inner wallboard surface. Press pad to surface of top, bottom and sides of box.
How do I put putty pads on an electrical box?
Press the pad into the area and adhere it to the top, sides, and bottom of the electrical box. Step 3: Remove the label or liner from the outer side of the Firestop putty pad. Remove any poly liner that is exposed. The putty pad can also be packed inside the conduit fittings to prevent smoke from passing through.