5. When a 13W system is balanced, the total watts of connected load between the

neutral and one hot wire is equal to the watts of connected load between the

neutral and the other hot wire.

Under these conditions, the currents in the hot

wires are equal and no current flows in the neutral. Hence, you would measure the

current in the neutral wire to determine whether or not the loads were balanced.

(The current should be zero if the system is balanced.)

7. 220 1.73 = 127.1 or 127 volts.

11. Table 1, for a 2,500 man 48' x 110' laundry gives the connected lighting as

8.2 KVA and the connected power load as 27.9 KVA.

This results in a total

connected load of 27.9 + 8.2 or 36.1 KVA. Table 2 gives the demand factor for a

laundry as 1.00. Hence, the demand load is 36.1 x 1.00 or 36.1 KVA.

13.

1

Table 1, attached memorandum.

2

Table 2, attached memorandum.

Referring to Table 1D, this system is predominantly motors (107.8 KVA) with some

lighting (21.99 KVA). From Table 3, attached memorandum, generator factor for this

type of load is 0.85.

Generator capacity (KW) =generator factor X sum of

individual demands (KVA), giving 0.85 x 122.59 = 104.2 KVA.

14. Enough

excess

generator

capacity

should

be

provided

to

supply

maximum demand when the largest generator is out of service. Two 60 KW and one 30

KW

will

provide

150

KW,

which

is

enough

to

supply

the

required

capacity,

but

provides

no

excess

generating

capacity.

Two

100

KW

generators

will

supply

the

required

capacity,

but

only

when

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