Location of the recessed fixtures and distance between them must be determined
Then, The right opening on the BT1200 Insulated ceiling box must be chosen according to the whole diameter. This will depend on the housing of chosen recessed fixture. In this demonstration, we have model number 300-130 with the hole opening diameter of 3-7/8 inches.
To install the insulated ceiling box, the four bar hangers have to be fastened to the bottom of the joist and secured with nails or wood screws. The opening on the box must be adjusted horizontally to the bar hangers. Then, the desired position of the plaster frame has to be secured by bending the lock and tabs on the bar hangers. Your installation box is installed, now to add the lights
Now that the BT1200 and Gypsum panels are installed, its time to cut the hole in the ceiling to install the recessed fixtures.
Before connecting the wires, power must be turned off. Then black wire, the live, have to be connected to the color wire. White wire, the neutral, has to be connected to the white wire. Bare Copper, the ground, has to be connected to the bare copper wire from the fixture. The use of a wire clip and connectors is mandatory. Notice, insulation must be in conformance with the electrical code of your region and the manufactures connections must not be removed.
The recessed fixture is now inserted in the ceiling opening.
Tighten the two screws with a drill or screwdriver until the fixture sites firmly in place.
Now the bulb and trim can be installed. Notice: Verify bulb orientation beforehand. If the ceiling is located under an attic space, a vapor barrier needs to be installed over the insulated ceiling box and taped onto the polyethylene barrier to block air circulation and prevent condensation.