Discussion Starter • #1 • Oct 24, 2008. Whether you're looking for advice on furnishing your living room or the next outdoor DIY project, we've got you covered. When the switch is turned off (open), the circuit path is open which indicates no current flows through the circuit. So what exactly is the difference between a single and double pole thermostat? 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). Battery changeover switches are also known as battery isolation switches / battery isolator switches. 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. That way, if either "hot" leg draws too much current, both breakers will trip simultaneously, effectively stopping all voltage to the appliance. Also, when using a metal box, wrap a piece of electrical tape around the screws to protect against shorts and arcs. No. Single pole thermostat If you’re using a 120V power supply, you only need a single-pole switch. Single Pole, Dual Tech., Manual On, White: Related Products. A circuit breaker that is connected to a 110-volt circuit is called a "single pole" breaker. Double pole wiring is used for setting up two and three-way switching for lights and fixtures. Double pole switches are more common in industrial settings or factories, however they can be … Most switches in a typical home tend to be single pole. It can either be a DPST (double pole, single throw) switch or a DPDT (double pole, double throw) switch. Switches are used on anything that operates using electricity. Kids are attracted to all sorts of objects, but mostly those that are glittery, shiny, bright, and colorful. They are normally installed in situations where the breaker box is alr… SWX 200 Series. Typical values for 120-volt circuit are 15 amps, 20 amps and on up to 50 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). Single Pole vs. The single-pole switch is the general-purpose workhorse of switches. Joined: 3 Jan 2003 Messages: 23,324 Thanks Received: 30 It is used … I'm just adding a couple of new double switched sockets and have the choice of either single pole or double pole. Electricians design the wiring in a building so that a preset maximum safe current is known for each circuit. The ones I have used are off in the middle. Circuit Breakers Control One "Hot" Wire. As far as switches go, the single-pole switch is the go-to workhorse for general purposes. 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. To safely protect 240-volt appliances, a circuit breaker must be connected to each of the 120-volt legs. A double pole circuit breaker from www.HardwareAndTools.com, By creating an account you agree to the Hunker, Explanation of single & double pole breakers. Neutral wires are spliced together in the switch box to completely bypass the switch. A double pole switch is usually rated at 30 amps, twice than a standard switch rated at 15-20 amps. Double Pole Double Throw (DPDT) Manual switches are more common in day-to-day life, but you can apply the same concepts to relays. A "neutral" or "return" line is connected to appliances and outlet receptacles to complete the circuit. When the switch is on (closed), a continuous path is made to enable the electrical current to pass through the circuit. Wide View Sensors. 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. Physically, single-pole and double-pole circuit breakers have obvious differences. The terms poles and throws refer to switch contact variations. "Double pole" circuit breakers are used in this case, which consist of two single circuit breakers whose trip handles are physically tied together. When spec’ing a truck, selecting between a single pole system and a dual-pole system can be a larger decision than people realize. 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. Double-pole breakers will also require twice the space in a breaker panel as their single-pole counterparts. 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. Identifying a Single Pole Thermostat and Double Pole Thermostat. Even if the ground wire isn’t properly connected, the switch will still work. If you want to be able to operate a light switch in two locations (e.g. Double pole stats have a true off setting. Generally, the current rating is labeled and it should be equal or higher than the current draw of the device. Sponsored Links; breezer. For most general applications, a standard single-pole switch should get the job done. 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 … Do I Always Need to Ground Light Switches? Simply put, the common simple light switches you see in your home are single-pole switches. One pair of black and red wire connects to the power supply’s switch. It only has one pair of terminals which is why it’s called a single-pole switch. (both poles) 1; 2; Next. The difference is all about the off setting -- or a lack of one. Some appliances, however, need a higher voltage, 240-volts, as they require much more energy to operate. The difference is all about the off setting — or a lack of one. Folks, Doing a remodel for a customer and ran into a new situation. 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. Next Last. This is a case of on-off vs isolation switching. A double pole switch is referred as a double pole, single throw switch. The first, a single pole breaker and the second, a double pole breaker. In higher ratings, a double pole switch is ideal because it has more room for thicker wires. The Cat. On the flip side, a double pole switch features two sets of brass terminals and a ground screw. 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. Single-pole breakers: Provide 120 volts, 15-20 amps and have one hot wire and one neutral wire. These household appliances include electric ranges (ovens), dryers, water heaters, central air conditioning systems and electric baseboard heat. As a rule of thumb, neutral wires (usually in white) aren’t connected to the switch. 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. Double pole switches are generally used to control 240V circuits and operate higher demand appliances and motors. Switches are used for operating lights, fans, garbage disposal, and even large electrical mechanisms. Most homes and small businesses are connected to a local utility company's power grid, which supplies two AC (alternating current) voltages, namely 120-volt and 240-volt supplies. 279B series are double action stations with six inch (150mm) wire leads for field wiring connections. These switches make it possible to safely isolate appliances. When it comes to neutral wires, neither the single or double pole has the terminals for them. If you’re looking to turn on or off a demanding electrical device, a double pole switch is required. Switches don’t have to be grounded if the junction box is metal and the said box is grounded. Every electrical outlet in a home is connected to a wiring system that gets its power delivered through a circuit breaker. Similar to the single-pole switch, a double pole switch comes with an on/off labeling. 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). Status Not open for further replies. 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. Go. Conversely, “throws” describe the number of separate positions that the switch can adopt. Double pole stats have a true off setting. 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. This sensor’s chase nipple attachment makes surface mounting to a finished ceiling simple and secure. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Link. However, not all single pole switches have the on/off labeling, most notably the rocker style switches. In terms of safety, both switches require ground screws that must be attached to a circuit ground. Single Pole No "Off" Feature: Two electrical wires Double pole switches feature two sets of two screws, a pair for each side of the switch. When you’re wiring switches, make sure to always check the power before starting the process. No. A double-pole switch controls two separate circuits. Planning out which switches and sockets to have in your home bears many questions. A double-pole switch is like two separate single-pole switches that are mechanically operated by the same lever, knob, or button. Generally, the current rating is labeled and it should be equal or higher than the current draw of the device. According to the National Electrical Code (NEC), all new circuit installations are required to have proper grounding. Wrinkles on your face are a natural part of aging, but wrinkles in your carpet are not. 1 of 2 Go to page. However, not all switches are the same. Both are types of line voltage thermostats, which typically control radiant, convection or resistance heaters. up and down the stairs), use double pole wiring. If you closely look at a single-pole switch, you’ll see a pair of brass terminals and a ground screw. In that case, a black tape should be wrapped around the white wire indicating that the neutral operates as a hot wire. 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. Double-pole breakers: Provide 240 volts, 20-60 amps and have two hot wires that share one neutral wire. The Cat. Single pole switches work best for turning on and off a light fixture or appliance. This cost saving could drastically effect the product price, however I do not want to compromise on quality & safety of the product. A "hot" … In a single-pole wiring system, the live hot wire is usually black and it connects to one side of the terminal. On the other hand, if you want to operate a device at two locations, you need a double pole switch. So what exactly is the difference between a single and double pole thermostat? There are many different types of switches and as mentioned before, we’ll discuss the single and double pole switch, and their key differences. Well, single-pole breakers and double-pole breakers differ in the voltage and amperage they provide as well as how they are wired. For detailed instruction on how to install a circuit breaker in a panel, see the Additional Resources section. The Key Differences Between Single-Pole and Double-Pole Switches. Essentially, a double pole is just two single switches together and can be controlled in two different locations. 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". Both are types of line voltage thermostats, which typically control radiant, convection or resistance heaters. Dan Keen is the publisher and editor of a county newspaper in New Jersey. Grounding is all about safety. socketboy, 30 Dec 2004 #1. When the switch is toggled, the current is cut to both circuits at the same time. In essence, wiring a single pole and double pole switch are similar. There is definitely a difference between Single Pole light switches and 3-Way light switches. BS7671 requires that only the live is switched in a circuit if its single pole else both live and neutral if double pole. This type of switch operates a circuit with two hot wires. Mixing up your wires means a faulty switch and can be dangerous. They operate one circuit and offer a standard on and off function. When a switch is wired to a 120-volt circuit, its purpose is to interrupt a single hot wire. We are a team of homeowners and home improvement enthusiasts who enjoy sharing decorating, gardening, home improvement, and housekeeping tips with other homeowners! For over 30 years he has written books and magazine articles for such publishers as McGraw-Hill. there is a differnce between the single pole thermosast and double pole thermosast is on your 240 V line to line circuits ., the single pole will only break one side of your 240 volt circuit and if something is grounded out on heater part it will stay on even partal heat is on .,, Single-Pole Switch. Under the hood, single-pole switches come with two brass-colored screw terminals that connect to the power source wires. For those appliances that require 240-volts, two power legs are connected to them, each with 120-volts, but that are in opposite phase. When replacing switches, an equipment ground isn’t required. The question is why or when should I use a double pole switched socket rather than a single pole one? 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. While a double pole is just up on and down off. Double pole wiring has four hot wires attached to it: two black and two red. Can I Wire a Double Pole Switch to Work As a Single-Pole? All types are available with single or double pole alarm contacts which can be normally open, normally closed or a combination of both. However, in the instance that the neutral is attached to the switch, it functions as a hot wire. However, we are here to help! As far a a double pole double throw. 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. It’s just the combination of two SPST switches that are controlled simultaneously by one mechanism. Light switches are grounded to add another layer of protection against shocks, electrocution, and fire. A noteworthy feature of double pole switches is their four hot brass terminal and a ground terminal. To know more about single and double pole switches, and the difference between them, check out our in-depth guide below. How to Get Wrinkles Out of Carpet Without A Stretcher. Maybe someone could also clarify the difference between a 2P (2 pole) and a (1P+N). Single pole switches are common, simple light switches. On a side note, the power source or hot wires are black in color. This enables you to attach the switch to two pairs of power sources from a 240-volt circuit. A single-pole switch controls just one circuit. And on in either top or bottom. A … Single pole thermostats don’t. Unlike the single pole setup, the power supply of a double pole isn’t directly tied to the heater – it’s powered by a separate circuit. Overall, for the most standard applications, you’ll be fine with using a single-pole switch. A special kind of circuit breaker is the tandem breaker, which is designed to allow two 120-volt circuits to be fit into a single slot in the circuit breaker box. 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… The switch only controls the flow of the current in one direction. A good example of this is when you have a switch both at the top and bottom of your stairs. For heavy-duty uses like power tools and water heaters, you should use a double pole switch. Its just an added belt and braces point of isolation. 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. WARNING: Make sure that you always ground your switches for safety reasons. 278B series are double action stations with terminals for field wiring connections. Here are some things to consider when choosing the right switch. Single Pole; 1P+N; The 1P+N is roughly 4 times the price of the single pole. There’s a switch in the thermostat that completely shuts off power to the heater. In this case, it can be left as is. 2 Posts . 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. They control one circuit and offer a regular off and on function. This type of switch is used to operate lights, fans, or any other device from a single location. A switch, in a mechanical and electrical setting, is a control device that is used to establish or interrupt … Aside from the terminals and circuits, another important distinction of double pole switching is it’s rated for a higher current. A single-pole t-stat is the same thing without the "on/off" micro switch. In this setup, the switches connect with the box through the grounding screws. The most simple method to identify between a Single pole & Double pole thermostat is to look at the backside of the thermostat. Relays are electrically actioned electromechanical switches. In the U.S., we have a way of supplying two poles with a higher voltage (240V). A circuit breaker controls one "hot" leg of a circuit. A single-throw switch features a pair of contacts that can be close or open. Every type of switch has two main components that control the circuit: a switch pole and a switch throw. For example, if you need a switch to operate a light or fan, a single switch works best. One of the most common questions around switches is the difference between a single and double pole switch. SPDT vs. DPDT “SPDT” stands for “single pole double throw,” while “DPDT” stands for “double pole double throw.” Both terms are varieties of switches. Electrical switches are used to interrupt the electrical flow in a circuit. A double pole breaker is primarily used with … Some of these include humidity,... How To Get Highlighter Out Of Carpet (Step-by-Step Guide). No batteries, no “power-stealing”. The contactor arrangement can be single pole, double pole, or triple pole, depending on the phase and application. What’s the Advantage of Double Pole Over Single-Pole? They are constructed with one hot wire and one neutral wire. A single circuit may consist of several wall outlets. Furthermore, for power tools with heavy amperage and a metal body, it’s safer to use double pole switches. Double Pole Switches. Ceiling Sensors. Single-pole breakers are thinner and have a single switch for on/off positions. As you can see, the main difference between a single-pole switch and a double switch is the number of terminals and controlled circuits. As mentioned, double pole wiring is used for heavy-load appliances like showers and cookers. A circuit breaker controls one "hot" leg of a circuit. Although double pole switches aka four-way switches are primarily used in industrial settings, they’re also found in residential wiring systems. Perhaps the most distinguishable characteristic of a single-pole switch is the on and off toggle. The other outgoing pair of wires feed the device. Essentially, a switch is a binary mechanism: it’s either completely closed (ON) or open (OFF). For older homes, it’s not unheard of to find switches with no grounding. The outgoing hot wire attaches to the other end of the terminal. Yes, you can! The “poles” are the separate circuits that are operated by a switch. However, for isolating a circuit, a double pole works better and mainly because it’s safer. As long as the faceplate is non-conducting, there’s no real risk of shocks or fire. 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. Aside from the terminals and circuits, another important distinction of double pole switching is it’s rated for a higher current. In a typical double-pole T-stat there are two micro switches. 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. Hunker may earn compensation through affiliate links in this story. The idea is to connect the wire to just connect on one side and only one switch or location controls the circuit. Also, the switch controls the device, fixture, or mechanism from a single location. In cases like this, a double pole switch is needed so the machine isn’t left energized at the other voltages. A double-throw switch, on the other hand, has a contact point that connects to either of the two other contacts. Now as you know the basic difference between a Single pole and Double pole thermostat, let’s see how to identify between the two. With five contractor friendly mounting methods, … Wiring a double pole switch as a single pole is fairly easy since only one side is used rather than both. 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