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GVAP416 Datasheet(PDF) 7 Page - Schneider Electric

Part # GVAP416
Description  Manual Motor Starters, Controllers, and Protectors Type GV2, GV3, and GV7
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Manufacturer  SCHNEIDER [Schneider Electric]
Direct Link  https://www.se.com/us/en/
Logo SCHNEIDER - Schneider Electric

GVAP416 Datasheet(HTML) 7 Page - Schneider Electric

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Manual Motor Starters, Controllers, and Protectors
General Information
7
10/02
© 2001-2002 Schneider Electric All Rights Reserved
FUSE AND CIRCUIT BREAKER SELECTION
Selecting the proper upstream short circuit protection for Group Motor installations can sometimes be
a confusing process. Specific National Electric Code rules must be applied for Group Motor installations.
The examples below illustrate the most common applications of GV manual starters with upstream short
circuit protection in a Group Motor installation. Refer to NEC Section 430-53 C and D for proper
conductor ampacity selection.
NOTE: Examples below show full load currents that may not be typical. Use actual motor nameplate
date for determining actual values.
Example 1:
Eight motors with the sizes shown below are installed on a conveying system. Choose the correct GV
manual starter and the proper size short circuit protection for this application. The user prefers time-
delay fuses.
One GV2M14, two GV2M10, and five GV2M08 manual starters would be selected for this group motor
installation.
Per N.E.C. section 430-52 & -53 and N.E.C. table 430-152, the time-delay fuse must be sized as follows:
175% FLA for largest motor + sum of FLAs for all other motors
==> (1.75 x 7.6) + (2 x 4.8) + (5 x 3.4) = 39.9 A
N.E.C. 430-52 allows use of the next largest standard size fuse — which in this case is 40 A. If nuisance
tripping is a problem with this fuse selection, N.E.C. does allow 225% of largest motor FLA to be used
in lieu of 175% when calculating the size. In this case, the calculation would be as follows:
(2.25 x 7.6) + (2 x 4.8) + (5 x 3.4) = 43.7 A
The next largest standard size in this case is a 45 A fuse.
Example 2:
Ten motors with the sizes shown below are installed on a packaging machine. Choose the proper size
circuit breaker for this application.
Per N.E.C. section 430-52 & -53 and N.E.C. table 430-152, the circuit breaker must be sized as follows:
250% FLA for largest motor + sum of FLAs for all other motors
==> (2.5 x 14) + 14 +7.6 + (2 x 4.8) + (5 x 3.4) = 83.2 A
The next largest standard size circuit breaker is 90 A.
If nuisance tripping is a problem, N.E.C. allows for circuit breaker sizes that “shall in no case exceed
400% for full load currents of 100 amps or less, or 300% for full load current greater than 100 amps”.
In this case:
(4.0 x 14) + 14 +7.6 + (2 x 4.8) + (5 x 3.4) = 104.2 A
The next largest standard size in this case is a 110 A circuit breaker.
Motor Qty
HP
Voltage
FLA
1
5
460
7.6
2
3
460
4.8
5
2
460
3.4
Motor Qty
HP
Voltage
FLA
2
10
460
14
15
460
7.6
23
460
4.8
52
460
3.4
Disconnect
Fuse or
Circuit Breaker
GV2 Manual Motor Starter
D-Line or K-Line Contactor
Motor


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