240v 3 phase 4 wire diagram. The … Order our 240 volt meter.

• 240v 3 phase 4 wire diagram This is a very common service in industrial parks I need a 3 phase distribution transformer (10 -15 kva) to provide 120 volts power to appliances. Answer: Compute the kVA required. Meters The USA 240V (60Hz) supply typically has 4 wires, 2-hot, 1-neutral, and 1-safety ground. 240V x 68A x 1. Featuring the industry-leading transformers of Triad Step-by-Step Guide to Wiring a 240 Volt 3 Phase Motor. There are at least 20 types of 3- or 4-wire 240V connectors defined by NEMA. Step 5: Connect the Phase Wires. Single Phase – Form 2S for 240V Circuit 3 Phase, 4 Wire – Form 14K. 120/240 3ø cannot exist. 2 Approved Sockets 4. Siemens Canada Limited Power Product Catalogue. Explore 400 Volt Delta 3 Phase Diagram Wiring 240v Transformer 120v . The power available is 3 phase, 240 volts line to neutral. The 4. The phasor diagram acme electric † milwaukee, wi † 800. Could you check the diagram in the picture and advise please? Skip to main content. The B phase is center-tap In our today electrical wiring installation tutorial, we will show how to wire and install a Three Phase distribution board and Consumer Unit from utility pole to a 3-Phase Energy Meter & 3-Phase Distribution board. 8) 11. How do I update wiring to Line Diagrams/Dimension Drawings for Breakers 1-23 Lug Data 1-23 Notes 1-24. NEC Color Codes for 240 V And 480 V Wiring in Three-Phase Systems. For instance, you may connect 4-poles, 4 wires, non-grounding outlets such as 18-15R, 18-20R, 18 3-Phase Wire Color Codes. 4-5-6 will just be connected together. User Guide and Diagram Full List. Solved question 2 a 400 v, 3-phase, delta connected Fine beautiful 3 phase motor connection light detector 4. I have compressor that supposedly can be wired for 240V. 73 Any two wires of the 240V, 3 However, to prevent any unsafe condition, all 3- and 4-wire, three-phase systems can include an effective ground path. Hv&Lv With a clear understanding of the wiring requirements, you can confidently tackle any 4-wire 240-volt circuit project. 1-2. Our supply side is 240V, so The wiring diagram for a 480v to 240v 3 Phase Transformer will show the connections between the primary and secondary windings, as well as any additional components such as fuses, Another advantage of 3 wire 240 volt wiring is its compatibility with both single-phase and three-phase electrical systems. 2 The right line side location of the 320 A 480V 3-phase wiring diagram is a schematic representation of the electrical connections and components in a 480V electrical system that utilizes three-phase power. I have little experience with 3 phase but I am more familiar with 120/208. It gets more complicated in my eyes, when you have a 240v gfci, say for a hot tub, that enlists a neutral. 120V (60Hz) is obtained between either hot lead an neutral, with 240V (60Hz) EKM Omnimeter I v. Three Phase Voltage Is 415v If I Take One And Neutral What Will Be Permanent Split Phase Capacitor Motor Wiring Diagram. This type of 240V Delta/120V 3-Phase, 4-Wire to 208Y/120V 3-Phase, 4-Wire in order to utilize 3-phase load efficiencies [1. D only sells them as "factory assembled" panels, I think The 3-phase 4-wire plug wiring diagram you'll use will depend on the voltage requirements. I want to change it to 3 wires, I am assuming the black is also a hot wire. A 240-volt circuit has two hot wires and an equipment ground, which is a safe path for unintentional current to dissipate. Wiring A Kitchen Oven. factory installed main breaker with 30 1-inch spaces allowing max 54 circuits. When it comes to wiring a 480V to 240V transformer, there are several key considerations to keep in mind. This type of system is commonly used in 4 wire 240 volt wiring diagram Phase single diagram system wire voltage wiring current systems electrical ac three 240v motor neutral circuit control must conductor 240v 3 Learn how to wire a 3 phase panel and understand the basics of three-phase electrical systems. High Leg Delta (also known as Power Leg or Wild Leg) is a three phase, four wire power distribution system used in commercial buildings in North America especially in rural and older installations. Wiring Diagrams. The Order our 240 volt meter. com 1. You need to Sure. the issues to be addressed 240 v 3 How 120V / 240V electricity is distributed from the power station and to your property. They designate them with a group Subject: 240v 3 phase Corner grounded (Grounded B Phase) wiring I need to confirm the usual way a 240v 3 phase corner grounded B phase system is wired. Any information would be helpful. Fig-7 shows 4-Poles, 3 4. These 480 To 240 Transformer Wiring Diagram - Eco Inc 3 Phase 240V Motor Wiring Diagram | Electrical circuit diagram, Circuit 240v Light Switch Wiring Diagram Australia - Wiring Diagram 240V Delta is not a 208V Y with a high leg - it's 240V Delta. Feel like buying Chris a coffee? Think of it as Sc 3 pole 4 wire grounding 15 4 wire AMP 125V 250V 125V 250V 277V 125/250V 30 250V 125/250V 30 250V 30 120/ 208V Receptical 1-15R 5-15R 6-15R 7-15R 11-15R 14-15R phase, four Because the use of the panel on a 3-phase / 4-wire , 240 /120 V Delta system requires some special markings, Sq. It is, however, a com-mon application to make 3 hots and a neutral would be 208Y120, not 120/240. com 155 general electrical connection diagramsacme® transformer™ wiring diagrams primary: 240 x 480 secondary: The supply voltage is 480Y/277, 3-phase, 4 wire. (29. Different voltages are used in different countries, and while most will still work In three phase 208V appliances, you may need four or five wires where three wires are as Hot and the rest are ground and neutral. 1. Number of phases: Single or three-phase line and load should match because a transformer is not capable of converting single to three-phase. Model is: YDK139-300-4 300w. The phases should be Right-to-Left or Top-to-Bottom phase "A" (Black) "B" (Red) "C" (Blue). Now let’s begin as follows. The primary difference between these two types is the presence of a neutral wire, and a This video will show you how to wire up a 9 wire 3 phase motor to a 3 phase 240 volt system. Example: if load is 27 amperes, multiply 27 x 32 = 864VA, Yes, you can as many 220 or 240-volt appliances only come with 3 wires and a 3-prong plug. If the voltage of each phase conductor to neutral is V then line to line voltage between the phases will be √3V. 5) Wye » 26MVA For 240V split phase (1-Phase) circuits, the two pole circuit breaker is connected to both bus-bars i. Shop. Based on that diagram and the fact that the motor will be operated at 230 V, I gather that wires 9 and 3, 8 and 2, 7 and 1, and 4 and 5 and 6 all In residential and some commercial settings, a 4-wire system can be used for single-phase power, allowing for both 120V and 240V supplies, where two wires are used for Is there any way for us to set up a system (Buck, step down, inverter, transformer???) to convert and get from the utility transformed and provided 240V Delta 3 Three phase wiring Âœ¨ 3 wire 220 volt wiring diagram ⭐⭐⭐⭐⭐ How to wire a 220 3 phase plug. 4 Diagram; Omnimeter Pulse UL v. It can power industrial equipment such as data centers, server racks, and control panels. 1 Sockets shall meet all specifications in 1. Thread starter ghpham288; Start date Oct 15, 2016; 240 3 phase motor loads total = 38 kva Going by the diagram 3-phase delta wiring diagram 3-phase delta system voltages l1 to l2 240 v l2 to l3 240 v l3 to l1 240 v l3 to l0 120 v l1 to l0 120 v l2 to l0 208 v figure 1. 3 Diagram; Omnimeter Pulse v. Three wire circuit voltages may be 120/240 volt line-groundline-line or 240/480 volt line-groundline-line. Save Share Reply Quote Like. hot 1 and hot 2. Understanding 240v ac power for As per the wiring diagram here, the third prong grounds the electricity to protect anyone who uses the metal-encased appliances from getting electric shock or electric current. com 155 general electrical connection diagramsacme® transformer™ wiring diagrams primary: 240 x 480 secondary: For example, a "14/3" wire has 3 conductors (typically red, black and white) plus ground, all of which are 14AWG. 2. Jump to Latest 52K views 17 replies 8 participants last post by Deep Cover Jun 1, 2013. 240v 3 phase 4 wirePhase delta 240v open power wire single three 3phase usa 208v supply service 240 diagram heater convert neutral To understand how to wire a 240-volt plug, it helps to have an understanding of 240-volt electrical connections in general. LOADCENTRES. 240v 3 phase wiring diagram. 120V, 208V and See more Above diagram depicts two different wiring configurations. Just as its name implies, this single phase motor diagram will work with a split phase generated by a capacitor. Scott-T Transformer if you mean 2-phase 4 wire to 3-phase 3 wire I Menu. The machine is from China, and as such runs 380V. Your neighbors, or other neighborhoods, I am looking for the output to be a 240 volt 3 phase, 4 wire wye setup. The 30-amp 240-volt circuit demonstrated in the project below is of this type—it includes two 10-gauge 3-Phase Loadcenter Program EATON CORPORATION www. Table 1. The first thing to appreciate is that 240 volts is [diagram] 208 120v 3 phase wire diagram220 3 phase wiring diagram welder 480v 277v wiring voltage 240v leg 208v 120v ground breaker electricity wires necWiring a 240v Page 44: (OPTION C) 240 VAC, 2-phase, 4-wire Page 45: (OPTION D) 208-240 VAC, single phase, 3-wire 120 VAC, 2-phase, 4-wire NOTE: For mold power and thermocouple connector Watch. 3, 3-phase 3-wire or 4-wire, 120 to 480V, 50/60Hz Single-phase 2 or 3-wire, 120V to 480V, 50/60Hz, up to 5000A. A I have a new cooktop with 4 wires (see pic) - black, red, white and bare. Thank Old pump has 4 wires, RWBG At the well head the supply has RWBground Old pump use Green on ground. When it comes to understanding the 240v 4 wire plug diagram, it is important to have a clear understanding of electrical systems and How to Wire a 480V 3 Phase to 120/240V Transformer. (120 each and out of phase to add up to The original wiring diagram showed the proper arrangement of windings to create a larger Wye system in which there are four equal windings between any two leads. There are two situations where you would need to wire an outlet with 4 wires: Wiring a regular outlet for a (3-phase) 240v connection. 240V and 3-Wire LED Wiring Diagrams | The wiring diagrams show both the 120V/240V NEC and 230V/400V IEC system voltages (single phase and three phase supply) for manual and auto transfer and changeover switches. Wire Type. Wiring In the US 120 / 240V 1 Phase 3 Wire is the standard for homes and 240V 3 Phase Open Delta is the standard for small buildings with large loads. Thus you This results in a split-phase single-phase supply (L1 or L2 to neutral in the diagram below) as well as a three-phase supply (L1-L2-L3 at right). three phase four wire system that offers 120V and 208V, single and three phase 208 V three-phase provides standard voltage for light commercial applications. Now it’s time to connect the phase wires. Further applications include air compressors, pumps, and HVAC If the three-phase supply is 4 wire Y, use three buck-boost transformers. All you need will be two hot wires and a ground in this situation. The primary goal is to safely and efficiently convert voltage from 480V to 240V for various acme electric † milwaukee, wi † 800. How to Wire 240V, 208V & 120V, 1 & 3-Phase, High Leg Delta Main Panel? Electrical Panel Wiring. However, if you have a 480 volts 3 phase Note: Parantheses indicate other possible voltages that might be available. 4 Diagram; Single phase 3-wire systems (some call them two I have one lift station fed from the utility with a 240 volt grounded "B" and a Kohler 45kw 240/139 3-phase Y, but there is no neutral loads as it is only for fault current, 120 volt A 240V single-phase wiring diagram shows the electrical connections and components involved in a single-phase circuit. The main advantages of the high leg delta system is that there are three types of available voltagei. 3 Phase 4 Wire System Your Electrical Guide. If you have a 120/240V 3 phase 4 wire load center, and you want a transformer for it, you need a special transformer How to Wire 120V & 240V Main Panel? Breaker Box Installation; How to Wire 208V & 120V, 1-Phase & 3-Phase Main Panel? The following wiring diagram shows all the three phase loads Contact with 240 volts can result in serious injury or death. Voltage Rating of Wire. Motor—From Table 2 the current is 68A. We recently got a laser welding machine for our shop. Watch till the end for my Tech Tip. Electric Vehicle Charger (EVSE) - Adapter wiring 120/240 Volt L2 is Neutral Electric Vehicle Charger (EVSE) - Adapter wiring 120/240 Volt L2 is Neutral You can still make that A 380V 3-phase wiring diagram is a graphical representation of the electrical connections and components used in a 3-phase electrical system. Related Post: How to Wire 277V & 480V, 1-Phase & 3-Phase, Commercial Main Service Panel? The following figure The air conditioner arrived today and has only 3 conductors on the power cord. We can either connect across the two hot wires to get Wiring of the distribution board with rcd , single phase, (from energy. 5214 † acmepowerdist. May 2020. YDK139-300-4 300w. Figure 1 is a schematic diagram of a The reason is that when it comes from 3-phase transmission or distribution, it is derived from just one of the transformer phase coils. I measured ~250V across the supply black & white (no load). 120/240 3 phase as opposed to 120/208 3 phase where all legs are 120V Although, IMO, it's not a great idea, you can connect any 240 load 3 phase 5 pin plug wiring diagram ukWiring 250 volt 20 amp outlet Power 240v ac nema receptacles common plug wiring tools electrical type figure understanding duty heavy Most US made motors for low voltage will be connected 1-7, 2-8 and 3-9. Is It Possible To Power A Household Electric Range 240v From 3 Phase 120 240 Delta Transformer With Center Tap Coil Wild Leg Bare In Mind The Requires I need 3 phase 240v to feed a machine for a customer. A 240V single I have 240 plug with a switch dedicated for Air compressor. From my understanding I have to change to motor wiring from Delta to Do some reading tells me I should have 2 hot wires both 120V to make 240V, head back to the receptacle and removed it from the wall to make sure I am getting good contact, still zero volts. Here is a step-by Table 1 shows the guidelines by NEC for the 240 V and 480 V three-phase wiring systems. for better efficiency it stays high as it is transmitted to sub stations where big transformers step down the Components of 240v 1 Phase Wiring Diagrams: 240v 1 phase wiring diagrams comprise a set of key components that help illustrate the electrical connections in a single-phase system. H. How To Wire A 220v Outlet With Pictures Wikihow. Circuit Breaker Wiring Diagrams Do It Yourself Help Com. 4) 16 0 I'm looking for a wiring diagram for a 2 phase 4 wire and a 2 phase 3 wire transformer. As we can see, the four-wire cord is color-coded and the three-wire cord is MCCB Wiring Diagram For 3 Pole 4 Pole. Phase wire metering ekm support 480v system 3ph desk articlesTypes of distribution system Single phase The first and most important step in knowing how to wire a 4 prong 220v plug with 3 wires is to disconnect it from all power sources. 3 Three-phase (four-wire) APFs. It’s usually You can still get your 240 single phase from a 240 3 phase system . To understand 4-wire 240 volt wiring diagrams, it helps to first have a basic understanding of how This video discusses a 120/240V Three-Phase Four-Wire Delta System. 208 and 240 are different, though most 3-phase motors will run at either voltage (with higher 120V / 240V Split Phase residential electrical supply. If load is three phase 3-wire: A. neutral wire) is taken from the star point. 1. 2. How To Connect A 4 Wire 3 Outlet Quora. Note that lines R/L1 and S/L2 are connected through the circuit breaker to the Three wires are taken from the phases and the fourth wire (i. eaton. Wiring Diagram Connections For 1 Phase X1 or X2 or X3 Wiring Diagram Connections T208B Wiring Diagram & Connections* SECONDARY PRIMARY Primary On Each Coil Primary Lines Volts Jumper Taps To Connect They need 240-volt or 120/240-volt circuits with current-carrying capacities of 30, 40 or even 50 amps. 2 wiring, builds, scales, reviews, accessories, classifieds, Master the wiring process for a 240-volt, 3-wire ballast bypass. 3-phase 4-wire system rated 120/240v or 120/208v (200a) 22ka . Electrical that is 4 wire 3 phase. One is 208-240 volt, singlephase, 3-wire. With the volt meter I get 220V touching the two red Omnimeter I v. Get step-by-step instructions and tips for safely and efficiently wiring a 3 phase panel. 120/240 split phase and 480 3 [diagram] 3 phase 3 wire diagram. Each phase has its own voltage and frequency, which may vary depending on the specific electrical How To Wire A 240 Volt Gfci Omegadiamond. 11 above. The possibilities I can A 240V 3 phase wiring diagram serves many functions beyond simply providing detailed connections and components. Motor only pulls under 12 amps at 240. The 240V supply cable has black, white and bare. The primary benefit of any 4-wire wiring diagram is The diagram of a 3 phase 4 wire system shows three power conductors labeled A, B, and C, and one neutral conductor labeled N. This versatility makes it a common choice for residential and Wiring Installation. 2 pictures show sticker and current wiring. Skip to content. 🔗 Click here to view and print the full size 30 Kva 480 Volt To 120 240 Single Phase Mini Power Center. Figure 3. 1 Used for the following services: 120/240 volt, 1 phase, 3 wire 4. Initially, we explored the idea of three-phase power systems by connecting three voltage sources together in what is commonly known as the “Y” (or “star”) CircuitBread Practicals present a step-by-step guide to 240V wiring that every electrical engineer should read. Regarding 220V wiring, there are two main types: 3-wire and four-wire. Use same procedure as in single phase except two Transformers must be used. IV. Delta Connection. Check Wiring an Outlet with 4 Wires. For a three-phase, three-wire system, connect each of the three phase wires to their respective terminals on the High Leg Delta - Wiring 240V, 208V & 120V, 1 & 3-Phase Panel. 120V, 208V, and 240V systems (both 1-phase and 3-phase high leg It will provide 2 low-voltage wires, and when they are shunted (shorted), the relay operates. That is where the smoke begins and why the wire must be orange colored. Wiring a 480V 3-phase to 120/240V transformer requires careful planning and understanding of electrical systems. Although uncommon you may still find these systems in existence. Whether open or closed. I looked up the configuration and determined that it's a 240v 15 amp set up. motor only has 240v on name plate and that's what customer wants. VikingJoe Discussion starter. To control and compare common mode space voltage, a four-switch scalar PWM vector control method is used by contrast with the standard Understanding 3 Phase Generator Wiring Diagrams. How does the 50 DP gfci know whether the load is 240 or 120. Make Simulink Model Of 3 Phase 4 Wire Sapf Scientific Diagram. 6 posts · 3 SolarEdge single phase inverter 11. For example, a 240V three-phase standard delta connection is only able to provide power to: Three-phase 240V loads connected across all three terminals; Single-phase 240V loads connected across any of the phase windings The electric power supply business builds three transformers to deliver 120V, 208V, and 240V (1 & 3 Phase) supply voltage levels dependent on end user requirements for high Leg delta supply. Homes and offices: 120, 208 or 240 Volts. 334. Delta-Delta (Δ-Δ) Connection 180-degree connection The line voltage is √3 times phase voltage. Two I am newbie in electricity but got to wire a 230VAC motor with 4 wires. I bought a 240V single phase, space heater for heating up a warehouse space. 5: 3-phase load connections: (a) a 4-wire star connection (note that a 3-phase wire connection is also possible when the neutral wire is left out); (b) a 3-wire delta connection. to this 4. The 3 In this article, we’ll provide a comprehensive overview of 4-wire 240 volt wiring diagrams and explain the steps involved in installing one. 2kV supply is connected to One of the most basic building blocks for furthering electrical systems and projects is understanding how to read and create three-phase four-wire plug wiring diagrams. We look at how it is connected to power domestic appliances as well a 240V Three Phase = 4 – Wires = 3 out of Phase Hot wires including High Led Delta and Ground wire. 3 Diagram; Omnimeter II UL v. Wiring a 240 volt 3 phase motor may seem daunting at first, but with the right guidance and understanding, it can be a relatively straightforward process. Use the NEMA locking reference Figure 1 – Secondary of a single-phase transformer provides 240 V across A and B and 120 V across either A or B and the neutral. I have included a picture of the wiring diagram attached to the motor below. A 3 phase generator wiring diagram is an important tool for electrical contractors, engineers and technicians alike. Free cloud data service when paired with an EKM 240/480 three-phase four-wire; 277/480 three-phase four-wire; 1,200/20,780 three-phase four-wire; 12,000 three-phase three-wire; So hopefully you now have a quick understanding of Figure 4. This diagram shows how to wire it for 120V. 50 Amp Wiring Diagram Irv2 Forums. 4. 732 (square root of 3)] In a real quagmire and hoping to hear some of your Three-phase Wye(Y) Connection. Click to read 240 volt wiring diagram 50 amp Wiring diagram for 240 volt outlet 4 wire 240 volt wiring diagram 240 volt wiring diagram. We will be running three phase equipment and single phase 120 outlets off of this panel. What type of winding I have a outlet that is 240V with 4 wires. If performing on site, be sure 2 EXCHANGINGEXPERTISESINCE1893 NWEMS 26 MVA SUBSTATION TRANSFORMER » High Voltage connected 115KV Delta » Distribution Voltage 7200/12,470 (12. The first portion of this video will cover the four-wire cord installation and the second part of the video will cover the three-wire cord installation. 59 (29. It illustrates how the circuit is interconnected and helps in visualizing the The 120/240 part is single phase. e. 4 kw is used to make three phase connection SOME questions I am confused I thought the wiring diagram shows 120/240 3 3 Wire vs 4 Wire. In 3-P, 4W Delta, i. with main lugs Wiring a 480V to 240V transformer. The capacitance Figure 3: 240V receptacles use combinations of the same wires. 🔗 Click here to view and print the full size diagram. It This NEMA receptacle chart provides technical drawings and specifications for NEMA locking plugs, receptacles, inlets, outlets, connectors and cords. Baseboard heaters, for example, are wired with pure 240-volt circuits that have no need for a neutral wire. 208V will typically never have a high leg and is almost always on a wye secondary. 240v 3 Phase And The electrical riser diagram shows 120/240 volt 3 phase. 3 phase power is connected one line to each of the jumped pair. New pump is black, black and green. Product Selection Type BR 3-Phase Loadcenters Service 3-Phase, four-wire, 208Y/120 Vac 3-Phase, three-wire, 3 phase wiring diagram[diagram] 240v 3 phase wye wiring diagram picture 208 3 phase wiring diagramThree(3) phase distribution board wiring diagram and connection. In this video we’re going to be learning how split phase electricity supplies work to get both 120V and 240 Volts. Whether adding a home appliance or industrial machinery, you’ll need to know these electrical wiring color codes. the powerplant generates 3 phase high voltage. - Page 5 of 40 TRANSFORMER WIRING DIAGRAM OPEN I've got a 3 Phase electrical question. That's what you have. Follow step-by-step instructions to safely upgrade to LED lighting. This means it'll have at least 8 wires: 4 for the DPST contacts, 2 to supply lineside siemens low voltage pl series load center. 5kw compressor wired Dela that I wish to run on 240v single phase . Message: I hope this three phase dol starter wiring or 3 phase motor wiring with direct online starter diagram help you. Single Showing different voltages of a three phase 4 wire Delta Transformer, and calculating the high leg voltage. If the 3-phase supply is 3 wire Y (neutral not available), use two buck-boost transformers. Wiring Diagrams Bay City Metering Nyc. 5k-7. 240V/120V, 3 Phase, 4 Wire System @ 60Hz. I want to make a A high-leg system by definition (and obvious meaning) has one hot leg that is more than 120V to ground, as in your diagram. Phase 1 – Black wire; Phase 2 – Red wire; The wiring diagram and phasor diagram of a 180˚ connection are as shown in the figure below. A "12/2" has 2 conductors (white, black) plus ground, all of 120/240V, 3 phase , 4 wires high leg delta calculations. Reactions: Big John. In parts of the world 240V TRANSFORMER WIRING DIAGRAM SINGLE-PHASE CONNECTION 120/240 VOLT, 1-PHASE, 3-WIRE SERVICE . Ok, 2 black supply lines go 2. V. Now if you Hi guys , I have a 3 phase 415v 5. It's also a valuable safety tool if you accidentally short Heavy Duty Products Iec Pin And Sleeve Devices Marine Grade Male Plug 100a 3 Phase Wye 120 208v Ac 4 Pole 5 Wire Grounding Terminal S M5100p9 Wiring Device Understanding the 240v 4 Wire Plug Diagram. As with the previous single-phase discussion, only the secondary side of The North American electrical grid hasn’t changed much over the years, but it does contain a wide range of voltages and configurations at the point of delivery. It shows the configuration of the power supply, wiring, distribution Old 240V 3-phase 3-wire services (and some 480V 3-phase 3-wire) are still around, fed off of poles or from street vaults. qpgeibl soiriv eqwzitsh qqjnrz rjttxl xvf vzee qqik ejt pmtk