large appliances with continuous and non-continues operation should be handled differently. Net total of general lighting and small appliances = 3 kVA + 2.1 kVA = 5.1 kVA Remaining 6 kVA (9 kVA – 3 kVA) at 35% = 2.1 kVA.For this reason, the first 3 kVA is rated at 100% while the remaining load can be rated at a demand factor of 35% (NEC Table 220.42). Similarly, all equipment are not always ON continuously such as electric iron, water heater, lighting, fans etc. ![]() (only one can be used as either electric heater or refrigerator depending on the temperature). Total of general lighting and small appliances = 4.5 kVA + 3 kVA + 1.5 kVA = 9 kVAĪs we know that all electrical appliances are not operational at once i.e. This way, the total general lighting and small appliances including laundry circuit rating: In short, a panel board or distribution board is a combination of multiple protective devices such as circuit breakers which is used to safely control and distribute the eclectic power to the load points such as lighting points and final circuits. load center, panel board, distribution board or consumer unit. Panelboard, Load Center & Distribution Board or Consumer Unitĭifferent terms are used for the same i.e. In today’s step by step guide, we will show how to select a right size panelboard (load center, distribution board or circuit breaker panel) according to NEC and IEC with solved examples. ![]() This way, load centers and distribution boards should be properly sized according to NEC and IEC or other applicable regional codes (similarly sizing a proper wire and cable, selecting right size MCBs or calculating the rating of plugs and outlets etc.). It is because the properly determined size of load center and panel boards will carry and handle the current as well as the future load (if any) safely and smoothly. Planning is the first and key priority for all electrical wiring projects and a proper estimation and analysis based on accurate calculation is must while designing and installation of a distribution system in residential or commercial applications. Sizing Load Center, Panelboards, Distribution Board & Consumer Unit According to NEC and IEC?
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