Views: 33 Author: China Micro Switch Manufacturer Publish Time: 2020-07-27 Origin: https://www.unionwells.com/
It's sad that many technicians do not have the slightest idea of the switch they are installing. They just go ahead and install switches without reading any instructions. Micro switches are of different types, including dead-front switch, clock-operated switch, bypass isolation switch, general-use switch, general-use snap switch, knife switch, door switch, transfer switch, motor-circuit switch. If you do not have the right idea about what you are working on, you probably will not get the best out of what you are doing. There has been several requests regarding what a general use snap switch is all about. This post will be making a comprehensive explanation of what it is and many others as well. Knowing a thing or two about switches will help you in the long run. So let's dig through them one after the other.
General Use Switch
This type of switch has been termed necessary for general distribution as well as branch circuits. They rate this very type of switch in amperes, while it is also capable of an interruption of its rated current at the rated voltage. In the same light, a switch that is rated at 15 amperes should be capable of opening or interrupting a current of 15 amperes alongside a 125V that is working within its terminals.
These switches are designed in such a way that they can be fit into a device box or mounted on covers. They can also be used along with systems that are compatible with their coding. General use switches are actually efficient and reliable when used in the items mentioned above.
General Special-Use Snap Switch
As a UL 1054 compliant switch, this one happens to be a special use snap switch that is fitted into an application so that it can accomplish a particular purpose. General special use snap switches aren't approved to be used in place of the preceding switch type, since it lacks the code system. That makes them a little limited in the way they can be used and where they can be applied.
General Use Snap Switch
General use snap switches on the other hand can be used within ganged boxes, with the condition that the voltage existing between adjacent switches should not be more than 300 voltage. A simple way to illustrate this is by having two similar switches in one box, with the two switches adjacently positioned to each other, while they are being fed from different phases. In that instance, both phases will be separated with a voltage of 480 volts, making it necessary for a barrier or separate box to be in place.
Many experienced installers try to bypass the 300 volts reference for these switches, thereby ending up exposing everybody within that space to serious electrical hazards. Although this 300 volts figure can be bypassed, you have to make sure the equipment is properly grounded for it to be safely used. There are a couple of ways to get the grounding done properly.
The first grounding option is by connecting both switches to the bonding jumper of the equipment, ultimately to the equipment's grounding conductor which is also a component of the circuit. Another alternative will be to connect the switch to any grounded metal box using metal screws, or with the help of non-metallic box courtesy of integral measures for having the switch device within the plastic container grounded appropriately.
Counting on the screws for the metal yoke connection where it's mounted is quite different from a situation that involves a receptacle. The normal screws that help hold a receptacle in place are not good enough for grounding because the receptacle is liable to more movements compared to an ordinary switch. Snap switches ought to make room for faceplates to be grounded regardless of whether a faceplate has been initially installed or not.
Grounding the switch assures that a metallic faceplate will not be unnecessarily energized when there is no path where any faulty current will be directed to the ground. When replacing a switch, this can be however exempted. That means, if a switch is being used to replace another switch, the grounding thing can be omitted, particularly where there is no provision for the switch to be grounded in the equipment.
Therefore, due to this exception, a ground switch can be beneath the ground, not too far from the conducting surfaces, with a non-conducting as well as non-combustible material faceplate. As that will be a safer way to have the current redirected to the earth where it will not cause any harm or inflict any onto the equipment where it is being installed. If you look at the switch types above, you would discover that they all look alike and closely similar. But if you have noticed that all the switches are not the same. They may look similar but are to be used according to the manufacturers' prescriptions.
Installing a switch outside the recommendations of the manufacturer will only result in more harm in the long run. If you are bypassing any of the standard connection practices, then you ought to do so along with the conditions you are expected to fully observe. We have been able to show in this post that switches are many. They are so many that sometimes installers tend to mistake one for another. What is worse is that they even go ahead and carry out their installation without observing the necessary instructions. In the course of this post, we have successfully narrated what general snap use switches are and what they can be used for. Once again, always remember that you cannot afford to mix these switches up. Doing that can lead to some serious consequences. To cut the long story short, general use snap switches are to be installed with specific instructions. So it will do you a lot of good to have those instructions observed.