WELDING MACHINES SCHEDULE OF LOADS

Individual Welding Machine Capacity: 500 Ampere Volts: 230V Duty Cycle: 5% multiplier:.22

Freq.: Phase:

60Hz 1Φ

Icap.welding Ampere Capcity X multiplier x D.F = 500A x 0.22 x 0.75 = 82.5 82.5 used 22mm² or 30mm² THHN/THW Icap.welding 82.5 Group welding Machine: as the sum of 100 percent of the two largest welders, plus 85 percent of the third largest welder, plus 70 percent of the fo urth largest welder, plus 60 percent of  all remaining welders. = (82.5+82.5)+.85(82.4)+.7(82 (82.5+82.5)+.85(82.4)+.7(82.5)+.6(82.5x2) .5)+.6(82.5x2) 391.88 391.88 amp. Total Current: =

Total Current:

=

Individual Welding Machine Capacit 500 Ampere Freq.: Volts: 230V Phase: Duty Cycle: 5% multiplier:.22

60Hz 1Φ

Icap.welding = Ampere Capcity X multiplier x D.F = 500A x 0.22 x 0.75 = 82.5 Icap.welding = 82.5 used 22mm² or 30mm² THHN/THW

LOCATION: CKT. No.

L.O.

MAIN CB FEEDER:

WAREHOUSE LOAD DESCRIPTION

C.O.

VOLTS

PANELBOARD DESIGNATION: MOUNTING:

300AT, 500AF, 240V, 3P Y200

KW

HP

THW,

IMC

PHASE RATING ØAB

ØCA

ØBC

BRANCH CKT BKR. 3Ø

AT

AF

P

SIZE OF WIRES (THHN) KAIC

BRANCH CKT.

1

WELDING MACHINE

230

82.50

100

100

2

22 mm²

2

WELDING MACHINE

230

82.50

100

100

2

22 mm²

3

WELDING MACHINE

230

82.50

100

100

2

22 mm²

4

WELDING MACHINE

230

82.50

100

100

2

22 mm²

5

WELDING MACHINE

230

82.50

100

100

2

22 mm²

6

WELDING MACHINE

230

82.50

100

100

2

22 mm²

7

SPARE - 1

230

50

100

2

8

SPARE - 2

230

50

100

2

9

SPARE - 3

230

50

100

2

10

SPARE - 4

230

50

100

2

10.00 10.00 10.00 10.00

TOTAL

185.00

COMPUTATION:

175.00

175.00

MDP SURFACE GROUND

0.00

CONDUCTOR:

PROTECTION:

I T

=

I T

=

341.05

(0.8 DF)

100 KAIC, BOLT-ON,

I T

=

272.84

AMPERES

INDUSTRIAL TYPE MCB

USE:

185.00 X 1.732 + (0.25x82.5)

KVA =

272.84

Y200

X

1.735

X

USE:

IMC

THW,

300AT, 500AF, 240V, 3P

230

1000 KVA =

108.88

REQUIREMENTS

EXISTING TRANSFORMER:

200KVA, 480/230V, 3P, 60HZ, DRY TYPE

I CURRENT

= = USE: 150AT, 480V, 3P

108.88 1.74

130.73

X 1000 X 480

ampere

Transformer Wire: Primary:

1 set - 3-60mm² THHN/THW

Secondary:

1 set - 3-200mm² THHN/THW

CONDUIT SIZE