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Safety switches refer to enclosed switches that are designed to serve as disconnecting means for service entrance as well as offer fault protection for motors. The enclosure offers personnel a degree of protection against incidental contact with the live electrical equipment.
In addition, it protects enclosed equipment against certain environmental conditions. Safety switches may have a switch or fuses and a switch.
Purpose of Safety Switches
Safety switches monitor the electrical flow thus, any irregularities in the flow of the current causes the switch to trip and stop the supply of power to the device. Some of the switches have the capability of cutting down power in just about 30 milliseconds.
Non-Fusible Safety Switch
A non-fusible switch refers to a safety switch that does not have any associated fuses. This switch does not also possess circuit protection capabilities; hence it only offers the convenience of opening and closing a circuit. By opening the circuit, it disengages the load from its electrical power source while closing the circuit links the load to the source. External overcurrent devices like circuit fuses and circuit breakers must provide protection of the circuit.
Fusible Safety Switch
A fusible safety switch refers to a safety switch that has been linked with fuses within a single enclosure. Thus, the switch offers a more convenient way of opening and closing the circuit manually while the fuse offers protection from overcurrent.
NEMA Rating Switches
There are different categories of NEMA rating of safety switches. They are classified as follows:
NEMA 1 – These are inclusions that are deemed ideal for indoor use. They offer people protection from contact with lie equipment.
NEMA 3R – These switches are ideal outdoor usage as they offer a higher degree of protection from electrical faults arising from external elements like sleet, ice formation and rain.
NEMA 4/4X - These are designed for both indoor and outdoor usage. These enclosures offer the circuits protection from damage risks due to hose water, rain, ice formation and splashing. The difference between “4” and “4X” is “4X” also offers protection against protection.
NEMA 5/12 offer inhabitants protection against any settling circulating or airborne dirt. In addition, it also offers protection against any dripping, falling as well as non-corrosive liquids.
The Required Amperage Rating
To make the right choice, it is important to take into account the required amperage rating, which is denoted by an A, when installing safety switches. The safety switches have varied amperage rating that include 800A, 400A, 600A, 200A, 100A, 60A and 30A. The rating is dependent on the amount of power that is required to run every electronic appliance, device or equipment on the property. Overall, those points that draw more electricity require safety switches that have higher amperage rating. Circuits that require less electricity only need low amperage safety switch.
Voltage Rating on Safety Switches
Voltage rating outlines the maximum amount of voltage that a safety switch may be exposed to. Thus, the voltage requirement could vary when purchasing the appropriate safety switch depending on the circuit. For instance, circuits supplying more voltage while powering high electricity-consuming equipment would need high voltage safety switch like the 600v. On the other hand, for circuits that supply power to devices that consume normal electricity, a 250v safety switch will be appropriate.
Single or Three Phase Safety Switches
Single-phase safety switches are ideal for electrical connections of between 230 to 250 volts that are common in houses. On the other hand, three-phase safety switches are perfect for powerful electrical connections of 450 volts and above, which are common in commercial establishments.
Whether it is a commercial building, industrial setting or normal dwelling, safety switches are mandatory for the protection of property from potential risk of electrical hazards. From the assets to human life, everything is dependent on the protection offered by safety switches in the event of electrical malfunction.
Author Bio: Jeson Pitt, Online marketing manager, writes on behalf of D&F Liquidators. He constantly shares his thoughts on innovations evolving in the field of electrical engineering, and is committed to helping people with any ‘electrical’ dilemmas or questions.