5. 2022_Short Circuit Study-Results for 200A disconnects.pdf
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- Solicitation number
- 12505B22R0025
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This document includes a federal solicitation for building services and a related technical report. The United States Department of Agriculture Agricultural Research Service is seeking proposals to replace two air compressors at a building in Ames, Iowa under solicitation number 12505B22R0025. The requirement is set aside exclusively for small businesses with a size standard of $16.5 million. The construction value is estimated between $500,000 and $1,000,000. The period of performance is 365 calendar days from notice to proceed. A pre-bid site visit was held in August 2022. Proposals are due by August 2022. The technical report details failures of two switches and associated buses during a short circuit study, requiring attention.
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2.2 SHORT-CIRCUIT FAILURE RESULTS
There were some equipment failures that surfaced during the study from the two scenarios that will require attention. The use of the utility source and generator contributions produced high short-circuit current values with motor contributions vs the rating of the equipment bus and breaker short circuit current ratings. See the following tables indicating areas of concern.
2.3 TABLE 1 - NORTH CAMPUS SCENARIO 1
As Found Normal Operating Condition Equipment Failures
Device/Bus Status Description Voltage (V) INT kA X/R
Manufacturer Bus/Device/ Rating% Calc/Dev/Series Rating%
AIR-COMP-1-DIS SWITCH Failed DH Heavy Duty 480 *14.09 1.61
BUS-0120
30-1200A 600 10.00
CUTLER-HAMMER
DH 80.00 *140.90
AIR-COMP-2-DIS SWITCH Failed DH Heavy Duty 480 *14.58 1.65
BUS-0121
30-1200A 600 10.00
CUTLER-HAMMER
DH 80.00 *145.80
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