![]() If the extra is 0.49 or less, round down to the next whole number. When the ampere calculation exceeds a whole number by 0.5 or more, round up to the next whole number. Rounding - Refer to 200.2(B) to end the rounding mystery.Thus when you calculate branch-circuit, feeder, and service loads, you must use a nominal system voltage of 120V, 120/240V, 208Y/120V, 240V, 347V, 480Y/277V, 480V, 600Y/347V, or 600V unless otherwise specified (220.2) ( Fig. Voltage - The voltage to use for your calculations depends on the system design voltage.Two items associated with this type of calculation repeatedly need clarification: 210 says about continuous loads, and understand the overcurrent protection requirements set forth in Art. ![]() For example, you must know the definitions in Art. The National Electrical Code (NEC) covers commercial calculations in Art. Note: This article is based on the 2002 NEC.Įven if you work with stamped drawings, you'll eventually need to do commercial load calculations in the field or on a licensing exam. If you’d like to see updated information on this topic, please check out this recently published article, Load Calculations - Part 1. Thank you for visiting one of our most popular classic articles.
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