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Application of a demand factor Because all loads do not operate at the same time, accept the first 10,000 and take 40 percent of the remainder:
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First 10 kVA of general load @ 100% Remainder of general load @ 40% (28,920 Total general load 04) 10,000 VA 11,568 VA 22,568 VA
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Net computed load for 120/240-V, three-wire, sin-
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gle-phase service: 22,568 VA 240 V 94 A
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This installation could get by with a 100-A loadpanel, meter base, and service entrance cable, but 200 A would provide a better safety margin and permit load increases
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The amperage rating of the loadcenter is determined by the size of the building and the anticipated electrical load The meter base, loadcenter, and SE cable must be sized
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TLFeBOOK
SERVICE ENTRANCE, LOADCENTERS, AND GROUNDING
for the same amperage rating The lowest-rated loadcenters are rated for 100 A, but some are made with ratings up to 800 A Loadcenters with 200-A ratings are now most commonly ordered for new home construction, but 400-A units are increasing in popularity Because of increasing electrical loads, year-round single-family home loadcenters should not be rated for less than 200 A today (Exceptions might be made for summer vacation cottages or cabins) Load calculations might indicate a load of only 150 A, but the possibility of increased loading must be considered If a loadcenter is undersized or is running close to its maximum load, the heat generated within the cabinet could trip the main circuit breaker In situations where the load is estimated at more than 200 A for example, 220 A two options are available: install both a 200-A and a 100-A loadcenter, or install a 300A loadcenter If two loadcenters are to be installed, the second should be installed next to first one, with parallel SE cables coming directly from the meter base bus bars, which have lugs or clamps that permit parallel-service wiring There are three reasons for installing two loadcenters rather than one large one
1 Difficulty in installing the wiring: A 200-A cable is difficult to bend and install, but
400-A cable is even more difficult to bend and install
2 Low availability of 300- and 400-A main circuit breakers 3 Space limitations of a single loadcenter: Two loadcenters with more wiring space
avoid cramming a large number of branch-circuit wires inside a single large cabinet To avoid installation problems, a careful estimate should be made of the number of branch circuits required before specifying the size of the loadcenter For example, a 200-A loadcenter that can contain from 8 to 40 circuits is typically designated as 40/40 In this case, the first figure refers to the number of tabs or stabs for installing full-size circuit breakers and the second figure refers to the number of available circuits if two-in-one or dual breakers are used A loadcenter designated 30/40 indicates that it can hold 30 full-size breakers for 30 circuits However, 40 circuits can be obtained with the 30 tabs if dual breakers are intermixed with full-size breakers, usually at locations near the bottom of the buses In situations where the number of branch circuits exceeds the rated capacity of the main panel or loadcenter, a subpanel can be used The diagram Fig 5-15 illustrates the method for connecting a main panel to a subpanel Both neutral and ground wires can connect to the same bus Because the ground and neutral buses are separated to keep neutral current off the grounding system, a main breaker is not required in the subpanel
BALANCING THE LOAD
A balanced electrical load is wired in the loadcenter so that current on one 240-V hot bus or leg is equal or close to the current on the other hot bus, canceling out any current in the neutral bus This balancing calls for determining the loads on each leg and organizing the circuit breakers in the panel so that, as far as is practical, comTLFeBOOK
LOADCENTERS (MAIN SERVICE PANELS)
Figure 5-15
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