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id="content" class="site-content clr"> <article id="post-3823"> <header class="entry-header clr"> <h1 class="single-post-title entry-title" itemprop="headline">High Leg delta connection</h1> </header> <div class="entry-content clr" itemprop="text"> <div class="code-block code-block-2" style="margin: 8px 0; clear: both;"> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-4567036280313464" data-ad-slot="7226276104" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div> <p>Power is transmitted over long distances at high voltage. In order to supply domestic and residential applications, it needs to be stepped down to 120V or 230V single phase. This conversion happens inside a transformer. If the secondary of this transformer is delta then, the centre of any one of the phases is centre-tapped and grounded. This allows 120V single phase for single-phase loads and 240V three-phase for three-phase loads, both served by a single transformer.</p> <div class="wp-block-image"><figure class="aligncenter size-medium"><picture class="wp-image-3830"> <source type="image/webp" data-lazy-srcset="https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--298x300.jpg.webp 298w, https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--150x150.jpg.webp 150w, https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--50x50.jpg.webp 50w, https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg-.jpg.webp 493w" srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20298%20300'%3E%3C/svg%3E" data-lazy-sizes="(max-width: 298px) 100vw, 298px"/> <img width="298" height="300" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20298%20300'%3E%3C/svg%3E" alt="High leg connection diagram" data-lazy-srcset="https://web.archive.org/web/20210501233029/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--298x300.jpg 298w, https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--150x150.jpg 150w, https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--50x50.jpg 50w, https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg-.jpg 493w" data-lazy-sizes="(max-width: 298px) 100vw, 298px" data-lazy-src="https://web.archive.org/web/20210501233029/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--298x300.jpg"/> </picture> <noscript><picture class="wp-image-3830"> <source type="image/webp" srcset="https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--298x300.jpg.webp 298w, https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--150x150.jpg.webp 150w, https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--50x50.jpg.webp 50w, https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg-.jpg.webp 493w" sizes="(max-width: 298px) 100vw, 298px"/> <img width="298" height="300" src="https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--298x300.jpg" alt="High leg connection diagram" srcset="https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--298x300.jpg 298w, https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--150x150.jpg 150w, https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg--50x50.jpg 50w, https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg_orange-leg_red-leg-.jpg 493w" sizes="(max-width: 298px) 100vw, 298px"/> </picture> </noscript></figure></div> <h2><strong>What is a high leg delta connection?</strong></h2> <p>A <strong>high leg delta connection</strong> is a configuration in which one of the windings in a delta connected secondary of a transformer is centre-tapped and grounded. It is also known as <strong>red leg connection or wild leg connection or orange leg connection</strong>. By doing so, we are creating a split phase supply as well as a three-phase delta connected supply. </p> <p>This type of configuration is commonly used in North America, especially in the United States. By using a high leg delta connection, we can get two 120V supplies, three 240V supply and a 208V supply. The phase with 208V supply to the ground is called High-Leg or Orange leg. This conductor needs to be marked permanently by orange outer finish where ever connection is made. </p> <p>A substitute for high leg delta is WYE or star-connected secondary with the centre point grounded. This connection can also provide three-phase as well as single-phase connections.</p> <p><strong>Voltage calculations</strong></p> <div class="wp-block-image"><figure class="aligncenter size-large is-resized"><picture class="wp-image-3829"> <source type="image/webp" data-lazy-srcset="https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg-delta-transformer.jpg.webp 406w, https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg-delta-transformer-287x300.jpg.webp 287w" srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20224%20235'%3E%3C/svg%3E" data-lazy-sizes="(max-width: 224px) 100vw, 224px"/> <img src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20224%20235'%3E%3C/svg%3E" alt="High leg delta connection transformer" width="224" height="235" data-lazy-srcset="https://web.archive.org/web/20210501233029/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg-delta-transformer.jpg 406w, https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg-delta-transformer-287x300.jpg 287w" data-lazy-sizes="(max-width: 224px) 100vw, 224px" data-lazy-src="https://web.archive.org/web/20210501233029/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg-delta-transformer.jpg"/> </picture> <noscript><picture class="wp-image-3829"> <source type="image/webp" srcset="https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg-delta-transformer.jpg.webp 406w, https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg-delta-transformer-287x300.jpg.webp 287w" sizes="(max-width: 224px) 100vw, 224px"/> <img src="https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg-delta-transformer.jpg" alt="High leg delta connection transformer" width="224" height="235" srcset="https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg-delta-transformer.jpg 406w, https://web.archive.org/web/20210501233029im_/https://www.electricalclassroom.com/wp-content/uploads/2020/03/high-leg-delta-transformer-287x300.jpg 287w" sizes="(max-width: 224px) 100vw, 224px"/> </picture> </noscript><figcaption>High leg delta connection transformer</figcaption></figure></div> <p>The voltage between the phases,</p> <p>V<sub>AB </sub>=V<sub>BC </sub>= V<sub>CA </sub></p> <p>The phase to neutral voltage can be calculated using the following formula:</p> <p>V<sub>AN </sub>= V<sub>AB </sub>/ 2</p> <p>V<sub>BN </sub>= V<sub>AB </sub>/ 2</p> <p>V<sub>CN </sub>= 1.743 * V<sub>AN </sub>= 1.743 * V<sub>BN </sub></p> <p>If the V<sub>AB</sub> is 240V, then</p> <p>V<sub>AN </sub>= 240/ 2 = 120V </p> <p>V<sub>BN </sub>= 240/ 2 = 120V</p> <p>V<sub>CN</sub> = 1.743 x 240 = 208V</p> <p>The 208V connection is typically not used.</p> <div class="code-block code-block-7" style="margin: 8px auto; 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