Reference Sheet
UPS Sizing Guide for Office Equipment
How to calculate the right UPS capacity (VA/Watts) for your office PCs, switches, NVR, and PABX — with a worked example and product recommendations for Pakistan.
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Revision
Updated Jun 2026
Technical Standard & Runbook
UPS Sizing Guide for Office Equipment
1. Executive Overview & Operational Context
How to calculate the right UPS capacity (VA/Watts) for your office PCs, switches, NVR, and PABX — with a worked example and product recommendations for Pakistan.
Standard engineered by Arbre IT Support & Solutions for deployment across corporate offices, industrial manufacturing facilities in SITE & Korangi, and commercial buildings in Karachi.
2. Field Commissioning & Quality Assurance Checklist
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Verify primary power voltage and standby battery float voltage (13.6V - 13.8V DC).
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Test manual override key switches and emergency break-glass push buttons.
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Verify event logging timestamps against localized NTP servers (GMT+05:00 Karachi).
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Perform simulated AC mains power failure test and confirm minimum 4-hour battery endurance.
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Ensure all terminal screws are torqued to manufacturer specifications and cable glands are sealed.
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Verify firmware is updated to current vendor-supported release with default credentials disabled.
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