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Wiring layout for adding a subpanel to a main panel
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parable loads operating at the same time are on opposite phases or buses This is easier to understand by referring to Fig 5-11, a simplified schematic for a single-phase, three-wire loadcenter Balancing lowers heat buildup in the wire terminals within the loadcenter and ensures a higher safe load on the panel If a loadcenter and main circuit breaker are rated for 200 A but the wiring permits a 300-A load on only one hot bus, the circuit breaker will trip However, if the load is split or balanced, the current will be only 150 A on each leg and this will be within the 200-A rating The circuit breaker tabs on each hot bus are arranged in opposite phases This permits single-phase branch circuit breakers with the same rating to be installed on opposite phases to cancel each other out By contrast, double-pole breakers are connected across both hot buses of the panel, so their current will balance automatically In general, breakers with the same ratings for loads that will be operating at the same time should be put on opposite phases For example, if two 5-A loads are put on the same phase, current in both the neutral and on one service entrance hot bus will add up to 10 A However, if they are put on opposite phases, 5 A will flow through each bus but will cancel out to 0 A in neutral Even if current on the neutral bus is not canceled, it will carry the difference between the loads on the opposite phases For example, if a 10-A load is on one phase and a 6-A load is on the other, the current through the service entrance neutral will only be 4 A; if they were both on the same phase, the neutral current would be 16 A
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SERVICE ENTRANCE, LOADCENTERS, AND GROUNDING
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This chapter focuses on the widely used miniature circuit breakers rated for 240 V or less Unlike the higher-voltage circuit breakers discussed in Chap 3, they are smaller and lower-rated versions of industrial-grade molded-case circuit breakers rated for 600 V or less These miniature breakers, called air circuit breakers, are based on thermal, magnetic, or combined thermal-magnetic principles They are now almost exclusively installed in all new residences, small businesses, and offices as well as updates of existing older electrical systems They are rated for amperes, voltage, and short-circuit or fault-current interruption Miniature circuit breakers perform the dual functions of a switch and a fuse They can open a circuit for safety or maintenance reasons simply by switching their toggle levers to the OFF position As substitutes for fuses, they provide automatic circuit protection and need not be replaced after a dangerous overcurrent has passed or a short circuit has been corrected The ampere rating defines the maximum current the circuit breaker can carry without tripping For typical miniature circuit breakers this rating is 15 to 125 A In residential applications, single-pole breakers protect 20-V branch circuits, and two-pole breakers protect 240-V branch circuits The voltage rating of a circuit breaker can be higher than the circuit voltage, but never lower The fault current interruption rating (or short-circuit interrupting rating) is the maximum available fault current that could be expected from the overhead or padmounted distribution transformer outside a residence If the transformer can produce 10,000 A of current, each breaker in the loadcenter should be rated for at least 10,000 A While residential breakers have ratings of 10,000, 22,000, 42,000, and 65,000 A, the available fault current for most single-family homes rarely exceeds 10,000 A Each miniature or branch circuit breaker, as shown in the cutaway view Fig 5-16, includes a bimetal strip or element When this strip is heated to its threshold tempera-
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Figure 5-16
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