What to Do First During a Power Outage

Most people don't realize: during a power outage, the real risk isn't the power going out — it's the power coming back. The voltage spikes that occur the instant the grid returns can permanently damage anything from TVs and computers to refrigerators and industrial machinery. A blown fuse is the lightest outcome; a fried motherboard, a damaged compressor, or a burnt motor winding is the worst.

In many regions — especially during summer when air-conditioning loads are heavy, in winter storms, or right after planned maintenance outages — we frequently encounter this scenario. In this guide, Berksan Jeneratör walks through the steps to take at home and at work during an outage, the protective equipment to use, and the measures that will permanently safeguard your devices.

What to do at home the moment the power goes out

Following these steps calmly when the grid fails protects both you and your devices:

• Unplug sensitive devices. Pull the plugs of TVs, computers, modems/routers, gaming consoles, and audio systems. This shields them from the voltage spike that occurs in the first seconds when the grid returns.
• Don't open the refrigerator or freezer. A closed fridge holds its temperature for 4-6 hours, a freezer for 24-48 hours. Repeated opening cuts these times in half.
• Check your boiler and thermostat. Some boiler models can struggle with the sudden restart. Switch the boiler off until the grid stabilizes.
• Stop running washing machines, dishwashers, and ovens. Programs cut mid-cycle can damage the electronic boards when power returns.
• If using candles, keep them away from flammables. Candle fires account for a significant share of fire department calls during outages. A battery-powered LED lamp is far safer.
• Save your phone for communication. Don't drain it on games and social media. In an emergency, the phone may be your lifeline.
• Stay away from elevators. If anyone is trapped, don't force the doors; call the fire department.

Important: don't plug devices back in the moment power returns. Wait 5-10 minutes — the first minutes carry the heaviest voltage fluctuations, and that brief delay drastically reduces the damage risk.

What to do at work the moment the power goes out

Workplaces are more complex because human safety, equipment protection, and business continuity must be managed simultaneously.

• Verify that emergency lighting has engaged. Fire and evacuation regulations require automatic emergency lighting in every workplace.
• Watch the UPS alerts in the server room. UPS battery time is limited (typically 15-30 minutes). Servers must be gracefully shut down within that window.
• Assess work-in-progress on production lines. Some processes (heat treatment, oven exit, pressing) turn the WIP into scrap when power is lost. A quick assessment with the foreman is critical.
• Check POS and till systems. Outages in retail and restaurants are a source of incomplete transactions and data loss. Switch to a mobile POS backup if available.
• Monitor cold-chain equipment. Cold storage, pharmaceutical fridges, dairy storage — once the temperature threshold is crossed, product loss begins. Check your temperature loggers if you have them.
• Check automatic doors and security systems. Building entry security, CCTV recorders, and alarm panels may go offline during the outage.
• Inform customers and staff. Transparent communication greatly reduces customer dissatisfaction during unexpected outages.
• If you have a generator, confirm the ATS engaged. The automatic transfer switch should engage within 5-15 seconds. If longer, manual intervention may be needed.

The hidden danger of returning power: voltage fluctuation

When the grid fails, there's no stabilized energy in the system. When the grid returns, every device in the area kicks in at once; this sudden current draw creates a voltage fluctuation in local transformers that can last 1-3 seconds.

This fluctuation manifests in several ways:

• Overvoltage: voltage briefly jumping to 240-280V instead of nominal 220V. Burns electronic motherboards.
• Undervoltage / brown-out: voltage dropping to 180-200V instead of 220V. Motorized devices (HVAC, fridge) strain and overheat their windings.
• Phase loss: one phase disappearing in three-phase systems — one of the most destructive scenarios for industrial motors.
• Transient spikes: brief microsecond pulses reaching 1,000-6,000V. Comparable to the effects of a lightning strike.

Any one of these four conditions is enough to destroy a modern electronic device's motherboard in a tenth of a second.

For sensitive devices: UPS protection

For high-value, sensitive electronics, the right answer is a UPS (Uninterruptible Power Supply). Many users see a UPS only as "a device that keeps things running for 5-10 minutes during an outage." It actually has two main functions:

• Power continuity: battery-feeds the device during an outage to prevent abrupt shutdown. Prevents data loss and file corruption on servers.
• Voltage conditioning: this can be even more important. Modern UPS units continuously filter incoming power and deliver clean, stable voltage at the output. They absorb sudden spikes, dips, and transient pulses.

Which UPS type fits which device?

• Offline / Standby UPS: sufficient for home PCs, modems, small office computers. Bypasses power normally, switches to battery during outages.
• Line-Interactive UPS: for small servers, professional workstations, small POS systems. Voltage regulation is always active.
• Online (Double Conversion) UPS: for data centers, hospital equipment, critical lab instruments. Continuous battery-inverter conversion between grid and device; the output is always clean.

For a home user, a 600-1500 VA line-interactive UPS will keep modem-router-PC running for 15-30 minutes and shield them from voltage fluctuations. This investment is less than the price of replacing a single damaged motherboard.

For the entire facility: voltage protection relay (and surge protectors)

A UPS protects what's plugged into it. Protecting the entire facility requires protective devices added to the main electrical panel. This is a three-layer protection strategy:

1. Voltage protection relay

Continuously measures grid voltage. When it falls outside a defined lower or upper limit, it cuts power to the entire facility automatically. When voltage returns to normal, it restores power after a configurable delay (typically 10-30 seconds).

• Single-phase models (residential) typically cut power below 175V and above 250V
• Three-phase industrial models also detect phase loss, phase sequence errors, and imbalance
• The reconnect delay ensures power is restored only after grid fluctuations have stabilized

2. Surge Protective Device (SPD)

Diverts very brief, very high-voltage pulses — caused by lightning, grid switching events, or large industrial equipment startup — to ground. Engages on events too fast for a voltage relay to detect.

• Type 1 (Class B): against direct lightning strikes, in the main panel
• Type 2 (Class C): against indirect lightning and grid surges, in sub-panels
• Type 3 (Class D): before sensitive devices, integrated into outlets

3. Circuit breakers and residual current devices

Should already be in any standard panel. Provides protection against overcurrent and ground faults. But these aren't sufficient for voltage fluctuations; a voltage protection relay must be considered in addition to them.

The right trio: voltage protection relay + SPD + UPS. Working together, they shield a home or workplace from nearly all outage-related signal disturbances.

For businesses: load analysis and priority protection

In larger businesses, treating all loads with equal importance isn't sensible from a cost or operational standpoint. The right approach is a load analysis to identify which systems get priority protection.

A typical priority hierarchy:

• Vital priority: servers, network equipment, security systems, cold chain, hospital operating rooms — UPS + voltage relay + SPD
• High priority: production line PLCs and control cabinets, ATS panel, BMS server — voltage relay + SPD + generator
• Medium priority: main lighting, office computers — generator
• Low priority: decorative lighting, secondary HVAC — can be excluded from protection

Regular maintenance: the invisible half of protection investment

Even the best protection equipment loses its function without maintenance. Frequently skipped maintenance items:

• UPS battery capacity test: battery life is 3-5 years. Annual internal resistance and capacity tests are required. With a dead battery, a UPS won't last 5 seconds during an outage.
• SPD condition check: every SPD (especially Type 2) absorbs energy each time it operates and consumes its lifespan. The status indicator (green/red window) should be checked periodically.
• Voltage relay test: setpoint values and delay times should be verified annually.
• Grounding resistance measurement: SPDs and other protective devices depend on a healthy ground. Grounding resistance should be measured every 5 years.
• Thermal camera scan inside the panel: loose connections turn into hot spots over the years. Detected with a thermal camera.

Outage preparation and immediate response checklist

Protection inventory to complete at home and at work before an outage occurs:

• Is there a UPS for sensitive electronics?
• Has a voltage protection relay been added to the main panel?
• Has an SPD been installed at the right type for the facility? (Type 1/2/3)
• Is grounding resistance within proper values?
• When were UPS batteries last tested?
• Are SPD status indicators monitored?
• Has a load priority analysis been done for the business?
• Is emergency lighting working?
• Has the outage response procedure been shared with staff?
• For homes, are LED flashlights and a portable powerbank ready?

What gets protected and what doesn't during an outage is determined not at the moment it happens, but by decisions made long before. Protection investments are inexpensive — repair and replacement costs are not.

Conclusion: backup power + protection equipment = energy security

Full protection against power outages is not provided by backup power generation alone (generator + UPS); it also requires protective equipment that monitors the quality of incoming power. The outage itself isn't the only threat; the "dirty" power that returns afterward is far more insidious.

The right architecture has three layers:

• Generation layer: generator — for long outages
• Bridge layer: UPS — keeps loads running through the first seconds
• Protection layer: voltage relay + SPD — shields against "dirty" voltage from the grid

At Berksan Jeneratör, we deliver an integrated energy security solution: correctly sized generators, UPS integration, main panel protection devices, periodic maintenance, and remote monitoring. Turning an outage from a crisis into a routine procedure is only possible when these three layers are designed together.