Chapter 12 Branch Circuits and Feeders 153
Copyright Goodheart-Willcox Co., Inc.
Showroom Storage
area
Sample Problem 12-9
Problem: The hardware store introduced in Sample
Problem 12-5 will have one duplex receptacle for
every 12′ of wall around the storage area and show-
room. A total of twelve floor receptacles will be used.
Determine the receptacle load, including show-
window receptacles for 20′ and 25′ show windows.
Solution: Receptacles will be placed along six 80′-long
walls and two 40′-long walls. Determine the number
of receptacles needed for each 80′-long wall:
Receptacles per 80′ wall =
= 6.67
80′
12′
Seven receptacles are needed for each 80′ wall. Next,
determine the number of receptacles needed for each
40′ wall:
Receptacles per 40′ wall =
= 3.33
40′
12′
Four receptacles are needed for each 40′ wall. The total
number of wall receptacles can now be calculated:
Wall receptacles = (6 × 7) + (2 × 4)
= 42 + 8
= 50
One receptacle is needed for every 12′ of show win-
dow length, so the 20′ show window requires two
receptacles and the 25′ show window requires 3 recep-
tacles. Therefore, the show windows require a total of
five receptacles. The total number of receptacles can
be found by adding together the wall receptacles, floor
receptacles, and show-window receptacles:
Total receptacles = 50 + 12 + 5
= 67 receptacles
The total receptacle load can then be determined:
Receptacle load = 67 × 180 VA
= 12,060 VA
The total receptacle load is 12,060 VA. For feeder siz-
ing, the first 10,000 VA must be counted at 100%, but
only 50% of the additional load needs to be consid-
ered. Determine 50% of 2060 VA:
2060 VA × 0.50 = 1030 VA
Feeder load = 10,000 VA + 1030 VA
= 11,030 VA
The receptacle load on the feeder is 11,030 VA.
Showroom Storage
area
Equipment Loads
Within this category of branch-circuit loads is a vast
array of equipment, such as appliances, water heaters,
washers, dryers, and cooking equipment. Most of these
items are used for brief periods and are considered
noncontinuous, so the required load supplied by the
circuit is identical to the equipment requirement.
Equipment is often hard-wired, but can also be cord-
and-plug connected to a receptacle. Branch circuits for
appliance loads must have conductors with an ampacity
equal to or exceeding the ampacity of the appliance. The
ampacity of the appliance is marked on the unit by the
manufacturer. If the appliance has a motor, the ampacity
of the branch-circuit conductors must be 125% of the
current rating of the motor.
Commercial kitchen equipment loads
Loads for commercial cooking equipment are
discussed in Section 220.56 of the Code. The total feeder
load is simply the sum of the nameplate ratings of the
appliances. If there are three or more pieces of cooking
equipment, the feeder load can be derated in accordance
with Table 220.56. The table in Figure 12-6 lists the
demand factors. The branch-circuit loads cannot be
derated using these factors.
Ovens, grills, fryers, food warmers, large vat blending
machines, booster heaters, conveyors, and tray assem-
blies are considered kitchen equipment and may be
derated in accordance with Table 220.56. Auxiliary
equipment such as exhaust fans, space heaters, and air-
conditioning units are not counted as kitchen equipment
and cannot be derated.