19PreparationsWhen installing the camera on a wall or a ceiling, there are four methods as specified below.(☞ Pages 20 and 21)• Using the two-gang junction box• Installing the camera directly on the ceiling or wall• Using the optional ceiling mount bracket WV-Q174 (for embedded installation on a ceiling)SF539 SF538• Using the optional ceiling mount bracket WV-Q105*1 (for direct mounting on a ceiling)IMPORTANT:• Procure 4 screws (M4) to secure the camera to a wall or a ceiling according to the material ofthe installation area. In this case, wood screws and nails should not be used. For mounting acamera on a concrete wall, use an anchor bolt (for M4) or an AY plug bolt (M4) for securing.(Recommended tightening torque: 1.6 N·m {1.18 lbf·ft})• Required pull-out capacity of a single screw/bolt is 196 N {44 lbf} or more.• If a ceiling board such as plaster board is too weak to support the total weight, the area shallbe sufficiently reinforced or the optional ceiling mount bracket for the camera, WV-Q105, mustbe used.The mounting conditions of the camera are described as follows:Installation place Applicablemount bracketRecommendedscrewNumber ofscrewMinimum pull-outstrength (per 1 pc.)Ceiling/wall Two-gang junctionboxM4 4 pcs. 196 N {44 lbf}Ceiling/wall (Direct mounting) M4 4 pcs. 196 N {44 lbf}SF539 SF538Ceiling WV-Q174(approx. 280 g{0.62 lbs})– – * 2Ceiling WV-Q105*1(approx. 150 g{0.33 lbs})– – *2*1 For Europe*2 Make sure that the installed mount bracket can support more than 5 times of the weight of thecamera.