My more than 25 year old rheem furnace gave out recently the culprit was easy to spot a burned out control board in the furnace that no longer allowed the blower fan to operate while the ac compressor was running of course a direct replacement board isnt available anymore but a little searching miraculously turned up this icm control board. Load furnace 15 kw i phase 230v find current kva wire size circuit breaker size use xlp use wire for underground wiring awg copper minimum 6 14 02 chapter 3 nec code rules and design practice 8 13 nec code rules and design practice 11 13 . Get started you will love this easy to use diagram software edraw max is perfect not only for professional looking flowcharts organizational charts mind maps but also network diagrams floor plans workflows fashion designs uml diagrams electrical diagrams science illustration charts and graphs and that is just the beginning. Figure 6 is a diagram for a 480 276 volt three phase four wire system this system serves hotels shopping centers etc transformers are used to get 120 volt single phase circuits figure 7 figure 7 shows the system used for large industrial plants where most of the load consists of motors it is a 480 volt delta three phase system. The power coming into your house does so on three wires 2 hots and one neutral if you were to take the cover off of your panel board and measure between the two hots you would find 220vac if you then measure between each hot and the neutral you would see 110vac your 220volt heater does not require a neutral nor does any 220vac load
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