“Modular Switches” by ContractorBhai.com
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So What you are seeing right now is modular switch. Switches nowadays are commonly called modular switch. This is a switch board and all this parts this covered plate, switches and sockets this are all separate parts and like a modular system all parts are separate and you can replace them as and when required. So let’s say for exapmle if this thing was inside a wall and switch goes bad and you want to replace it, so this cover plat comes out, you un screw the four points and on the back side there are locks for every items, for switch for sockets. So you can try to open the locks and the switch comes out OK, and you get a new switch ofcourse there would be wiring and all that this is to be done by electrician. This video is only for information purpose. What electrician do he will unwire and remove the switch and then put a new switch inside again he would take care of the locks. It goes inside and electrician will wire the switch screw back whole thing in to the wall and the plat goes on top again, it will get lock aswell. So this switches are called modular switches. Because very beautifully very conveniently you can separat different parts and replace which ever parts is required and the olden days of system wooden switch board and there was lot of hassle and unorganised system inside. But modular switch makes very neat and clean and very easy to maintain.
https://www.mrmetric.com/?leadsource=MC1127 SEMS screws combine two separate components into one pre-assembled, cost-effective fastener. These handy devices combine the screw and the washer into a single part, eliminating the need to match the right items up and slip the washer into place by hand. It also simplifies your inventory by giving you one part to track and purchase instead of two.
SEMs typically come with some form of lockwasher to prevent slippage once the screw is firmly secured. Two popular choices include internal-tooth and external-tooth lockwashers. Double SEMs contain two washers instead of just one. In addition to a lockwasher, a double SEM also has a flat washer that sits on top of the locking washer. Of course, sometimes all these options can get a little confusing. Which SEM is right for your needs?
Well regarded as experts in metric, contact us 1-866-501-9504 and we’ll be glad to discuss it with you and help you with your purchase. Mr. Metric is the leading metric fastener specialist in North America.