I know each leg has 240v to another phase or to ground ⦠In a corner grounded delta system, one of the three phase legs is intentionally grounded. Solidly-grounded Delta System. Don(resqcapt19) IP: 64.12.101.177. The term grounded half loop would be an accurate descriptor. It could also prohibit a corner grounded 240V delta since using a grounding transformer a 240V system could be grounded with a L-G voltage of only 139V. 4 Wire Delta Transformer. Let's assume I have to use a 230V 3 phase motor. Be careful when installing slash-rated breakers on a solidly grounded high-leg delta system. The requirements you reference are used to prohibit ungrounded 208Y systems. My Design was to Corner Ground the 480V Delta SDS, so as to derive a Stable Voltage-To-Ground⦠Compared with the solidly-grounded wye system of Figure 1 this system grounding arrangement has a number of disadvantages. There is no way of grounding a 480V system (or any over 260V L-L) to meet ⦠We use our trainer model ⦠The grounded loop is a ground image antenna. I didn't think, it even existed. Both plants had ground fault indicator lights. I have multiple 240v single phase loads and (1) 240v 3 phase load. I was well experienced with the 240 volt version. A corner grounded (delta) transformer is an industrial hack from the 1950âs. For me, the last Corner Grounded Delta I have dealt with was on a Design-Build Project we did back in October 2009. You can feed 3 phase loads with a 2 pole breaker and be in compliance with the code. Member Name: Jim Sutton Email: ⦠Hello I need a 240V 3 phase source to supply a new motor. In addition, if you have any sort of rectification stage, for example in a VSD, then the DC rail voltages relative to ground will be very different. Section 230.90(B) generally prohibits an overcurrent protection device to be placed in the grounded conductor if it does not open all the circuit conductors simultaneously. A corner grounded delta system will put more stress on the insulation between windings and ground. This exceeds the 120V line-to-ground voltage rating of the 120/240V slash breaker. This demonstration video shares the wiring, voltage and history of a corner grounded delta bank. The phase-to-ground voltages are not equal, and therefore the ⦠It is always a half loop with the other half an Earth Image. The system is a 240v 3phase corner grounded delta system with "B" phase intensionally grounded. This is a specialty case for our site as all of our motors are 480V. If the leg chosen is the B phase, then the voltage to ground for A and C will be 240 volts, while for B it will be zero. The grounded conductor in a corner grounded system is no different than any other grounded conductor and does not require OCPD. ... 240V 3ph. The delta system can also be grounded, as shown in Figure 2 below. 3 Wire Service Section for "Power"; both derived from a single 240/120V 3ph. I know you cannot get any 120v loads but what about single phase 240v loads. I honestly, never had any experience with 480 volts, corner grounded delta. Our electric supply is 480V B-Phase Ground (Corner Grounded) Delta. Slash marked circuit breakers such as 120/240V or 277/480V must not be used on corner-grounded delta systems. Do not install them on corner-grounded, resistance-grounded, or ungrounded systems. This antenna is inherently unbalanced like a ground mounted vertical or an elevated vertical with a ⦠With `` B '' phase intensionally grounded to ground ⦠the requirements reference! 240 volt version be in compliance with the 240 volt version not require.... 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