OHM’s law and our pie chart are the only calculations and formula that the test taker should focus on. P divided by Current (I) times the Voltage (E) is used for calculating demand loads, calculating transformers, calculating services, calculating the minimum number of circuits required for a particular dwelling/occupancy, and in calculating a wire size […]
Transformer questions are actually quite simple, however the state exam writers intentionally include a lot of distracting information. The unprepared test taker will read too much into a transformer question and then draw a complete blank. However, if it asks to size the maximum or minimum short circuit, ground-fault, or any other over current protection […]
We all know article 100 is the DEFINITIONS article. This does not mean that general terms or technical terms from related codes and standards will be found in this article. Article 100 only includes definitions are that essential to the proper application of the Code. Also, keep in mind that only the terms that are […]
When dealing with a transformer question the test taker must determine whether or not the question is a calculation question that involves the sizing of over current protection devices, or is simply just a question using Ohms Law to size the transformer. www.TexasElectricalExam.com
BE CAREFUL HOW THEY WORD THE NUMBER OF CONDUCTORS. They note that “A 250 kcmil …. Conductor … WITH (3) other similar conductors…” therefore we are actually dealing with a total of 4 conductors. This is a common wording used by the state exam writers and it causes many test takers to be fooled. www.TexasElectricalExam.com
Helpful Tip # 109 It is attention to minute, specific details that can make a 5-to-10 point difference on a test examiners score. It is highly imperative to reread a test question after you think you’ve formulated your answer just to ensure that you have in fact actually picked the answer that matches exactly word […]
Helpful Tip # 108 Usually in the field, we express answers or express measurements as square inches or square feet or cubic feet such as 39.37 sq. in. The code; however, states the inches in parentheses and then has the word square on the outside. Example: (39.37 in.) square www.TexasElectricalExam.com Get Square for your […]
Helpful Tip # 107 One of the key items about the PSI exam in Texas is that the test writers are very specific with the phraseology and wording of both a test question and the answer. One critical component that you have to pay attention to; is literally, how does your answer matchup word […]
Helpful Tip # 106 Another formula needed for the Master’s exam is: The Square Root of (I2A + I2B + I2C) – (IA X IB) – (IB X IC) – (IC X IA) This Formula is used to calculate the “Imbalanced Load” on a Neutral in a Three Phase system. It is a complicated and […]
By Mike Holt, NEC Consultant Though it covers solar power systems, Article 690 is not light reading.Article 690, consisting of eight Parts, applies to Photovoltaic (PV) electrical energy systems, array circuit(s), inverter(s), and charge controller(s) for PV systems. The requirements of Chapters 1 through 4 apply to these installations, except as specifically modified by Article 690.These […]