Why Every Workstation Should Use a Properly Sized Pure Sine Wave UPS

Help Desk Admin

Aug 02, 2026

107

Article ID: KB26080010

Quick answer

A compatible uninterruptible power supply (UPS) can provide short-term battery power and voltage protection for a computer during an outage or power fluctuation. PCMIT recommends an approved, properly sized pure sine wave model for supported workstation equipment.

Why sizing and compatibility matter

A UPS has both a volt-ampere rating and a watt capacity. The connected load must remain within the manufacturer's limits.
Pure sine wave output improves compatibility with computer power supplies, including equipment that uses active power-factor correction.
Runtime depends on the UPS battery, its age, the connected load, and the condition of incoming power.
A UPS is not a substitute for building electrical repair, grounding, surge planning, data backup, or safe shutdown procedures.

Before you begin

✓ Ask PCMIT to confirm the UPS model, watt and volt-ampere capacity, and approved connected equipment for the workstation.

✓ Confirm the wall outlet is grounded, secure, dry, undamaged, and suitable for the UPS according to the manufacturer's instructions.

✓ Save open work and follow the site's approved shutdown procedure before changing power connections.

Safe workstation setup

Place the UPS upright on a stable, dry, ventilated surface.
Connect the UPS directly to an appropriate grounded wall outlet unless its manufacturer and a qualified professional specify otherwise.
Connect only the approved computer, monitor, and specifically approved low-draw network equipment to battery-backed outlets.
Keep airflow openings clear and keep liquids, heaters, and direct heat away.
Label the UPS with its location and service or battery-replacement date.
Report replace-battery lights, fault codes, unexpected shutdowns, or repeated alarms to PCMIT.

Do not connect these items to an ordinary desktop UPS

Laser printers or copiers
Space heaters, fans with large motors, refrigerators, microwaves, or coffee equipment
Vacuum cleaners, shredders, or other high-current appliances
Another UPS, an extension cord, or a daisy-chained power strip
Equipment whose maximum load has not been evaluated

Laser printers can draw very high current during operation. Schneider Electric/APC advises against connecting a laser printer to ordinary Back-UPS battery or surge-only outlets. A specially engineered installation requires separate sizing and approval.

Expected result

The workstation remains protected by an approved UPS without overload or fault indications. During a brief outage, users have time to save work and follow the approved shutdown process; the UPS is not used to continue normal work indefinitely.

⚠️ Stop and contact PCMIT when

⚠ The UPS displays a fault, overload, replace-battery warning, or continuous alarm.
⚠ Equipment turns off when the UPS transfers to battery.
⚠ The UPS or battery is hot, swollen, cracked, leaking, smoking, or producing an unusual odor.
⚠ The wall outlet is loose, damaged, ungrounded, wet, discolored, or sparking.
⚠ You need to add equipment or do not know which outlets are battery-backed.

Do not open a UPS or battery enclosure. For smoke, fire, sparks, or immediate electrical danger, move away, follow the site's emergency procedure, and call emergency services when appropriate.

Contact the PCMIT Help Desk

☎️ Phone: 888-910-1114
✉️ Email: [email protected]
🌐 Portal: help.pcmitcorp.com

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