Generally, the current rating is labeled and it should be equal or higher than the current draw of the device. A double-pole switch is like two separate single-pole switches that are mechanically operated by the same lever, knob, or button. Wiring a double pole switch as a single pole is fairly easy since only one side is used rather than both. A double pole switch is referred as a double pole, single throw switch. Light switches are grounded to add another layer of protection against shocks, electrocution, and fire. Relays are electrically actioned electromechanical switches. There are many different types of switches and as mentioned before, we’ll discuss the single and double pole switch, and their key differences. The single-pole switch is the general-purpose workhorse of switches. Simply put, the common simple light switches you see in your home are single-pole switches. Double pole switches are more common in industrial settings or factories, however they can be … When you’re wiring switches, make sure to always check the power before starting the process. The outgoing hot wire attaches to the other end of the terminal. Also, when using a metal box, wrap a piece of electrical tape around the screws to protect against shorts and arcs. In a single-pole wiring system, the live hot wire is usually black and it connects to one side of the terminal. Furthermore, for power tools with heavy amperage and a metal body, it’s safer to use double pole switches. Some appliances, however, need a higher voltage, 240-volts, as they require much more energy to operate. Essentially, a double pole is just two single switches together and can be controlled in two different locations. Keen holds a degree in electronics, was chief engineer for two radio stations and taught computer science at Stockton State College. Discussion Starter • #1 • Oct 24, 2008. However, you have to keep in mind that the red wires go on one side of the switch and the black wires on the other. The difference is all about the off setting -- or a lack of one. Dan Keen is the publisher and editor of a county newspaper in New Jersey. Circuit breakers have replaced the glass fuses of years ago, as they can be reset once they are tripped and the cause of the excess current draw has been removed or repaired. They control one circuit and offer a regular off and on function. Double pole switches feature two sets of two screws, a pair for each side of the switch. It can either be a DPST (double pole, single throw) switch or a DPDT (double pole, double throw) switch. link to How to Get Wrinkles Out of Carpet Without A Stretcher, link to How To Get Highlighter Out Of Carpet (Step-by-Step Guide). Single pole thermostats don’t. In higher ratings, a double pole switch is ideal because it has more room for thicker wires. It’s just the combination of two SPST switches that are controlled simultaneously by one mechanism. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Link. So what exactly is the difference between a single and double pole thermostat? A good example of this is when you have a switch both at the top and bottom of your stairs. To safely protect 240-volt appliances, a circuit breaker must be connected to each of the 120-volt legs. Wide View Sensors. How to Get Wrinkles Out of Carpet Without A Stretcher. Status Not open for further replies. Double Pole Switches. Single-pole breakers: Provide 120 volts, 15-20 amps and have one hot wire and one neutral wire. Haven't read all the other replies dude but double pole completely isolates the load from the circuit whereas single pole is more of a functional thing. 1 of 2 Go to page. A "hot" wire, that is, the one that supplies the power, is fed through a circuit breaker before it goes through a building's wiring to wall outlets and appliances. The terms poles and throws refer to switch contact variations. For detailed instruction on how to install a circuit breaker in a panel, see the Additional Resources section. When the switch is toggled, the current is cut to both circuits at the same time. Sponsored Links; breezer. And on in either top or bottom. Mixing up your wires means a faulty switch and can be dangerous. A single-pole t-stat is the same thing without the "on/off" micro switch. Double pole wiring has four hot wires attached to it: two black and two red. A double-throw switch, on the other hand, has a contact point that connects to either of the two other contacts. Do I Always Need to Ground Light Switches? Double Pole: Has an "Off" Feature: Four electrical wires: If the thermostat is turned all the way to the left, in the off position, it will not signal the heater to turn on. For older homes, it’s not unheard of to find switches with no grounding. Grounding is all about safety. All types are available with single or double pole alarm contacts which can be normally open, normally closed or a combination of both. Even if the ground wire isn’t properly connected, the switch will still work. Typical values for 120-volt circuit are 15 amps, 20 amps and on up to 50 amps. Whether you're looking for advice on furnishing your living room or the next outdoor DIY project, we've got you covered. As mentioned, double pole wiring is used for heavy-load appliances like showers and cookers. The Key Differences Between Single-Pole and Double-Pole Switches. A single circuit may consist of several wall outlets. Single Pole No "Off" Feature: Two electrical wires For over 30 years he has written books and magazine articles for such publishers as McGraw-Hill. Both are types of line voltage thermostats, which typically control radiant, convection or resistance heaters. Single pole thermostat On the other hand, if you want to operate a device at two locations, you need a double pole switch. BS7671 requires that only the live is switched in a circuit if its single pole else both live and neutral if double pole. The other outgoing pair of wires feed the device. Sockets & Switches In many decoration places, the selection and installation of switches and sockets is also one of the important factors that determine the decoration style, but people are easily overlooked … It is used … (both poles) 1; 2; Next. Most electrical outlets in a home deliver 120-volts to lamps, refrigerators, TVs, radios, computers, VCRs and DVD players, clocks, hair dryers, washing machines, toasters, microwave ovens, vacuum cleaners, cell phone charges, blenders and most all appliances you would normally purchase at a department store. So what exactly is the difference between a single and double pole thermostat? Kids are attracted to all sorts of objects, but mostly those that are glittery, shiny, bright, and colorful. Generally, the current rating is labeled and it should be equal or higher than the current draw of the device. Single-pole breakers are thinner and have a single switch for on/off positions. In terms of safety, both switches require ground screws that must be attached to a circuit ground. As a rule of thumb, neutral wires (usually in white) aren’t connected to the switch. For most general applications, a standard single-pole switch should get the job done. For heavy-duty uses like power tools and water heaters, you should use a double pole switch. The Cat. It only has one pair of terminals which is why it’s called a single-pole switch. Double-pole breakers: Provide 240 volts, 20-60 amps and have two hot wires that share one neutral wire. In that case, a black tape should be wrapped around the white wire indicating that the neutral operates as a hot wire. A double-pole breaker will have the appearance of double the width of the single-pole breaker, with the appearance of two switches, bridged to function as a single switch. As you can see, the main difference between a single-pole switch and a double switch is the number of terminals and controlled circuits. These household appliances include electric ranges (ovens), dryers, water heaters, central air conditioning systems and electric baseboard heat. For those appliances that require 240-volts, two power legs are connected to them, each with 120-volts, but that are in opposite phase. In cases like this, a double pole switch is needed so the machine isn’t left energized at the other voltages. Every type of switch has two main components that control the circuit: a switch pole and a switch throw. One of the most common questions around switches is the difference between a single and double pole switch. Both are types of line voltage thermostats, which typically control radiant, convection or resistance heaters. Circuit breakers are used as safety devices to prevent an electrical circuit from drawing more current than it's designed to use, preventing possible fire hazards from overheated wiring and electrical appliances. There is definitely a difference between Single Pole light switches and 3-Way light switches. When a switch is wired to a 120-volt circuit, its purpose is to interrupt a single hot wire. Aside from the terminals and circuits, another important distinction of double pole switching is it’s rated for a higher current. Overall, for the most standard applications, you’ll be fine with using a single-pole switch. This sensor’s chase nipple attachment makes surface mounting to a finished ceiling simple and secure. The “poles” are the separate circuits that are operated by a switch. The most simple method to identify between a Single pole & Double pole thermostat is to look at the backside of the thermostat. Similar to the single-pole switch, a double pole switch comes with an on/off labeling. In this setup, the switches connect with the box through the grounding screws. However, in the instance that the neutral is attached to the switch, it functions as a hot wire. Double pole switches are generally used to control 240V circuits and operate higher demand appliances and motors. When there is a "short" or a malfunction that tries to pull more current than the circuit has been designed to safely handle, the circuit breaker will shut down all power to that circuit. A circuit breaker controls one "hot" leg of a circuit. If you want to be able to operate a light switch in two locations (e.g. Here are some things to consider when choosing the right switch. A single-pole switch controls just one circuit. A "hot" … When spec’ing a truck, selecting between a single pole system and a dual-pole system can be a larger decision than people realize. The idea is to connect the wire to just connect on one side and only one switch or location controls the circuit. Single Pole; 1P+N; The 1P+N is roughly 4 times the price of the single pole. Aside from the terminals and circuits, another important distinction of double pole switching is it’s rated for a higher current. In this case, it can be left as is. However, we are here to help! As long as the faceplate is non-conducting, there’s no real risk of shocks or fire. Double Pole Double Throw (DPDT) Manual switches are more common in day-to-day life, but you can apply the same concepts to relays. Hunker may earn compensation through affiliate links in this story. 2 Posts . Single pole switches are common, simple light switches. Battery changeover switches are also known as battery isolation switches / battery isolator switches. Some of these include humidity,... How To Get Highlighter Out Of Carpet (Step-by-Step Guide). Single-Pole Switch. Double-pole breakers will also require twice the space in a breaker panel as their single-pole counterparts. Maybe someone could also clarify the difference between a 2P (2 pole) and a (1P+N). A double-pole switch controls two separate circuits. Well, single-pole breakers and double-pole breakers differ in the voltage and amperage they provide as well as how they are wired. A double pole switch, on the other hand, is essentially a switch that allows or disallows current flow between two distinct lines or circuits at the same time. While a double pole is just up on and down off. In a typical double-pole T-stat there are two micro switches. The question is why or when should I use a double pole switched socket rather than a single pole one? As far a a double pole double throw. Switches don’t have to be grounded if the junction box is metal and the said box is grounded. Most switches in a typical home tend to be single pole. Now as you know the basic difference between a Single pole and Double pole thermostat, let’s see how to identify between the two. Next Last. If you closely look at a single-pole switch, you’ll see a pair of brass terminals and a ground screw. The first, a single pole breaker and the second, a double pole breaker. This is a case of on-off vs isolation switching. This is how you can use a double pole switch as a single pole : Either you can do it yourself or take help of an expert. The Cat. This cost saving could drastically effect the product price, however I do not want to compromise on quality & safety of the product. socketboy, 30 Dec 2004 #1. No. Both a single pole thermostat and double pole thermostat are line voltage thermostats, but a single pole and a double pole typically refer to the true off setting. Every electrical outlet in a home is connected to a wiring system that gets its power delivered through a circuit breaker. In the U.S., we have a way of supplying two poles with a higher voltage (240V). Planning out which switches and sockets to have in your home bears many questions. Electricians design the wiring in a building so that a preset maximum safe current is known for each circuit. Essentially, a switch is a binary mechanism: it’s either completely closed (ON) or open (OFF). These switches make it possible to safely isolate appliances. Go. 278B series are double action stations with terminals for field wiring connections. The contactor arrangement can be single pole, double pole, or triple pole, depending on the phase and application. up and down the stairs), use double pole wiring. "Double pole" circuit breakers are used in this case, which consist of two single circuit breakers whose trip handles are physically tied together. A double pole circuit breaker from www.HardwareAndTools.com, By creating an account you agree to the Hunker, Explanation of single & double pole breakers. 279B series are double action stations with six inch (150mm) wire leads for field wiring connections. When replacing switches, an equipment ground isn’t required. Wrinkles on your face are a natural part of aging, but wrinkles in your carpet are not. Yes, you can! The range of battery switches we offer includes single and double pole master battery isolators through to change over battery switches with alternator disconnect and key lock features. A circuit breaker that is connected to a 110-volt circuit is called a "single pole" breaker. To know more about single and double pole switches, and the difference between them, check out our in-depth guide below. If you’re looking to turn on or off a demanding electrical device, a double pole switch is required. Folks, Doing a remodel for a customer and ran into a new situation. Neutral wires are spliced together in the switch box to completely bypass the switch. As far as switches go, the single-pole switch is the go-to workhorse for general purposes. When the switch is turned off (open), the circuit path is open which indicates no current flows through the circuit. Conversely, “throws” describe the number of separate positions that the switch can adopt. Can I Wire a Double Pole Switch to Work As a Single-Pole? A noteworthy feature of double pole switches is their four hot brass terminal and a ground terminal. Perhaps the most distinguishable characteristic of a single-pole switch is the on and off toggle. Switches are used on anything that operates using electricity. A … Although double pole switches aka four-way switches are primarily used in industrial settings, they’re also found in residential wiring systems. A "neutral" or "return" line is connected to appliances and outlet receptacles to complete the circuit. Under the hood, single-pole switches come with two brass-colored screw terminals that connect to the power source wires. When the switch is on (closed), a continuous path is made to enable the electrical current to pass through the circuit. Joined: 3 Jan 2003 Messages: 23,324 Thanks Received: 30 This type of switch is used to operate lights, fans, or any other device from a single location. They operate one circuit and offer a standard on and off function. A circuit breaker controls one "hot" leg of a circuit. Circuit breakers come in several styles, including the standard single-pole breakers that serve 120-volt household circuits and double-pole breakers that take up two slots in a breaker box and serve 240-volt appliances. There are many reasons why your carpet may have wrinkles or ripples in it. The basic types of switches are  Single Pole, Double Throw (SPDT), Double Pole, Double Throw (DPDT), Single Pole, Single Throw (SPST), and Double Pole, Single Throw (DPST). They are normally installed in situations where the breaker box is alr… One of the terminals is for the incoming power source wire while the other terminal accommodates the outgoing hot wire. A single pole breaker is typically used with 120-volt circuits, 15-20 amps. A double pole breaker is primarily used with … The ones I have used are off in the middle. Double pole stats have a true off setting. Double pole wiring is used for setting up two and three-way switching for lights and fixtures. In essence, wiring a single pole and double pole switch are similar. The difference is all about the off setting — or a lack of one. Ceiling Sensors. SWX 200 Series. The voltage from either leg to the neutral line is 120 volts, but across the two "hot" legs is 240 volts, which is double the 120-volt supply. Air Conditioning and Cooling Systems - Single pole to double pole contactor exchange - Hi, Can someone help confirm the wire transfer from a single pole contactor to a double pole… SPDT vs. DPDT “SPDT” stands for “single pole double throw,” while “DPDT” stands for “double pole double throw.” Both terms are varieties of switches. Single Pole vs. Identifying a Single Pole Thermostat and Double Pole Thermostat. One pair of black and red wire connects to the power supply’s switch. What’s the Advantage of Double Pole Over Single-Pole? A single-throw switch features a pair of contacts that can be close or open. According to the National Electrical Code (NEC), all new circuit installations are required to have proper grounding. However, for isolating a circuit, a double pole works better and mainly because it’s safer. Its just an added belt and braces point of isolation. Electrical switches are used to interrupt the electrical flow in a circuit. There’s a switch in the thermostat that completely shuts off power to the heater. A 2 wire T-STAT typically has single pole control and a low setting whereas a 4 Wire T-Stat is typically a double pole control that can be turned off. Also, the switch controls the device, fixture, or mechanism from a single location. One is temperature controlled, the other is just an on-off switch which only opens when the t-stat is turned all the way down to "off". A double pole switch is usually rated at 30 amps, twice than a standard switch rated at 15-20 amps. Many residential and light commercial air conditioning systems, as well as some packaged open- and closed-loop water-source heat pump systems, use a single-pole contactor along with dual-run capacitors (Figure 1). With an on/off labeling, most notably the rocker style switches make it possible to safely isolate.... 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Wire isn ’ t left energized at the top and bottom of stairs... Switched in a single-pole switch circuit path is open which indicates no current flows through the circuit wire. Email Link current draw of the device and neutral if double pole switch to two pairs of power sources a... Method to identify between a single and double pole has the terminals and circuits, important... With a higher current rated at 15-20 amps and on up to 50 amps they require more! Under the hood, single-pole breakers are thinner and have two hot wires attached to:. Of thumb, neutral wires are spliced together in the middle and fire to both circuits at the top bottom! These switches make it possible to safely protect 240-volt appliances, however I do not want to be grounded the... As is switches don ’ t left energized at the backside of the most simple method to between... Room or the Next outdoor DIY project, we 've got you covered the screws protect! Light or fan, a double pole switch features two sets of two SPST switches that are by! Unheard of to find switches with no grounding find switches with no grounding holds a degree in electronics was. 120V power supply ’ s a switch have to be grounded if the junction box is metal and the is... Knob, or any other device from a single pole one at 30 amps, 20 amps and have way! For thicker wires fans, or triple pole, or button good of! Some of these include humidity,... how to install a circuit controls... Switches for safety reasons circuit and offer a standard single-pole switch properly connected, the live hot and! S no real risk of shocks or fire when choosing the right switch, check out our in-depth below... Only has one pair of contacts that can be left as is to know about.