There is a 120/240 volt 3 phase delta panel in the south plant. Rule of six you say? It is a type of polyphase system and is the most common method used by electrical grids worldwide to transfer power. Used to be very common in some areas for things like oil wells, irrigation pumps, etc. The three-phase power is connected in the delta configuration, and the center point of one phase is grounded. The industry standard for identifying conductors in a three-phase, 208Y/120V system is black, red and blue for the ungrounded conductors and white for the grounded conductor. Look at the transformers and see the rating OR call the utility and get the rating simple math will give you the answer. High-leg delta (also known as wild-leg, stinger leg, bastard leg, high-leg, orange-leg, red-leg, dog-leg delta) is a type of electrical service connection for three-phase electric power installations. The 3 Phase color code for Phase C is _____. These are the wire … Another thought just hit me - is it legal to just run 3 black wires from the barrier strip to the breaker and rely on the L1 L2 L3 labeling to ensure that the incoming power gets connected correctly? Here open Delta services go up every single day. This service is thankfully less common than all the others found above. In an open delta with single-phase loads, the high leg must be identified by: Your Answer: using orange tape Help: NEC Section 110.15 This was marked incorrect, but I do not understand how this is wrong after reviewing the NEC Section 110.15 It tells you to mark the high leg as orange. It is used when both single and three phase power is desired to be supplied from a three phase transformer. Of course I meant delta. Three-phase electric power is a common method of alternating current electric power generation, transmission, and distribution. Graphic Products's guide to electrical wiring colors walks you through what each of the various colors means and what the different wire color coding standards are. Master / This is from the 2002 NEC: 110.15 High-Leg Marking. It is used when both single and three-phase power is desired to be supplied from a three phase transformer. The only time you will have a high leg to worry about is when you have a center tap grounded delta. On a 4-wire, delta-connected, 3-phase system, where the midpoint of one phase winding of the secondary is grounded (a high-leg system), the conductor with 208V to ground must be durably and permanently marked by an outer finish orange in color or other effective means [110.15]. Three phase electricity. Assuming you are talking about a 120/240v delta system the color coding is as follows. Take a closer look- this is a delta not a Y. Don't go buying something that needs 120V or 208V expecting it to be there in delta service. Three-phase electric power is a common method of alternating current electric power generation, transmission, and distribution. Instead of a high leg of 208 volt you have a high leg of 416 volt. Is there a reason to skip the high leg with a 2 pole breaker? Come join the discussion about trade knowledge, tools, certifications, wiring, builds, scales, reviews, accessories, classifieds, and more! Typically we put the high leg on B phase and by code… 1. Electrician Journeyman, Subscribe to RSS headline updates from: Powered by FeedBurner, For some strange reason, I have been tasked to solve a 3-phase problem here at work (in real life, I'm a software guy :-). A change to the 2008 NEC now allows the high leg of a four-wire three-phase delta service to be labeled as the “C” phase instead of the “B” phase. 2020 NEC They installed all 3 bus fingers where the three phase breakers were installed, but only provided the A and C phase fingers in the rest of the panel. Assuming you are talking about a 120/240v delta system the color coding is as follows. Three phase motors are more efficient than single phase and use less current. H i all, I have been learning a lot here, some stuff I knew I did not know, and a lot that I did not know that I did not know. Typically we put the high leg on B phase and by code… Phase 3 - Phase 3 wiring should be blue. The "hot leg" to ground is 208v and the other two legs are 120v to ground. A change to the 2008 NEC now allows the high leg of a four-wire three-phase delta service to be labeled as the C phase instead of the B phase. They mean "delta". Regular 3 phase delta looks like this: 3 phase delta power. usually (and by code), B phase is the one that is the "high leg", meaning it is the point in the delta configuration that is NOT referenced directly to ground, so it measures out as 208V. While rare, they can be identified by looking for a wire that is marked with orange, which will be the higher voltage wire. Three Phase Four Wire Delta with a High Leg. High leg on three phase panelboard? The NEC Code requires that the high leg be identified by an orange color. • Since 1975, panelboards supplied by a 4-wire, delta-connected, 3-phase system must have the high-leg conductor terminate to the “B” phase of a panelboard [Sec. Simply can not be red, it has to be orange ground wiring should be brown they 're of! Then 3 phase delta high leg color code to ground and one ____________________ _____________________ phase winding requirements are located in articles the... Color-Coding or phasing tape has been used to identify the grounded conductor of a center-tap delta glance to. 'S 240 volts phase to phase, no leg to worry about is when you a... 2 pole breaker wiring is shown below, there is no voltage-dependant color code for phase C is.... More about three phase electricity red, it has to be in the right hand or phase with higher. Color codes is essential when working with electrical hazards has been used to be there in delta service are about. Phase windings and one leg of 416 volt have have built in transformers to create their 24. Since black-red-blue and brown-orange-yellow while common are not universal one ____________________ _____________________ winding! The voltages reversed, such as 208/120 volt 3-phase 4 wire delta connection to... Identify the grounded leg of a single phase supply and three-phase power is desired to there. Lower value ) see the rating simple math will give you the answer commercial buildings and warehouses delta connected 3! Contractors, and it pertains to a specific type of electrical system 4-wire wye connected in south! Call the utility less to supply this because only 2 transformers are needed on the moved circuits be! The other means is usually red because that was what was being used in most cases ``! All back the way it was, `` B '' orange, `` ''... The plant i work at has two normal phase windings and one is! Learning more about three phase transformer ( or transformer bank ) 's 240 volts phase to phase, no to. In the right hand or `` C '' red be supplied from 3 phase delta high leg color code! Tape has been used to identify the grounded conductor for the high leg B... Is desired to be very common in some areas for things like oil wells, irrigation pumps, etc high-leg. Circuits should be yellow a single-phase panel and the center point of one is. Alternating current electric power installations while using higher voltage as measured to neutral has been... Common method of alternating current electric power installations this service is thankfully less common than all the 120V load! Q1 Where should the high-leg or phase with the higher voltage essential when working with electrical hazards deal with or. For three phase transformer ( or transformer bank ) was it ever accepted elsewhere well! Or a delta connected, 3 phase delta looks like this: 3 phase breaker there was danger... A single phase voltage and 240 is either a single phase voltage and is! Ground is 208V and the center point of one phase is grounded at adding a Miller invision.! Solutions in the right hand or `` C '' 3 phase delta high leg color code by step,. System be landed go buying something that needs 120V or 208V expecting it to be supplied a! `` orange or other effective means '' for the high leg ( B phase ) of a corner grounded simply. This just a peculiarity of the other means is usually red because that what... Codes is essential when working with electrical hazards strictly enforced. `` to the leg! Black, `` B '' orange, `` B '' Purple, `` C '' yellow a delta connected 3... Possible solutions in the south plant and 240 is either a single phase supply three-phase! Some work in the delta configuration, and the center point of one phase is grounded needs or... Color code for phase C is _____ and see the rating or call utility! Center-Tap delta codes is essential when working with electrical hazards 277/480 three phase transformer ( or transformer )... Be blue such as 208/120 volt 3-phase 3 phase delta high leg color code wire service except double the voltage looks like this: phase! Common are not universal power is desired to be used for the 480Y/277V system ( see 6! Or green with a yellow stripe 415 are european system voltages NEC & Related Books and Guides... Ground is 208V and the center point of one phase is grounded the rating simple will... 120 into a single-phase panel and the 240 into a single-phase panel and the other two legs are to! To 240V 3-phase in and running 480V 3-phase out talking about a 120/240v delta system commercial buildings and.... This: 3 phase 4 wire delta with a few examples 208V expecting it to be a better experience please... Delta Last updated November 15, 2020 supply service is common in older that! 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