Portable Generator Use + Safety Reference

Overview

Portable generators are common but cause hundreds of carbon monoxide deaths annually. As locksmiths/technicians often consulted on emergency power, knowing portable generator safety is essential.

Critical safety: carbon monoxide

CO is odorless, colorless, deadly.

Sources:

• Exhaust from generator engine
• Any combustion engine

Risk level:

• 70 ppm: mild headache after 1-2 hours
• 200 ppm: severe headache + nausea after 2-3 hours
• 800 ppm: dizziness + nausea after 45 minutes; death after 2-3 hours
• 1,600 ppm: headache + nausea immediately; death after 1 hour

A portable generator inside a garage can reach 1,000+ ppm within 10 minutes.

Rules:

• NEVER run a portable generator indoors - not in garage, not in basement, not in shed, not even with door open
• Generator must be outside, 20+ ft from house openings
• Exhaust direction: away from doors, windows, vents
• CO detector indoors: every floor of home with sleeping area

Despite these warnings, 70-80 Americans die from CO poisoning during outages each year. Always educate customers.

Generator placement during use

Minimum distances:

• 20 ft from any building (some areas require 25+)
• 15 ft from any window or door
• Never closer to AC intake (CO drawn into home)

Surface:

• Dry, level, fire-resistant
• Concrete, gravel, paving (NOT grass or wet ground)
• Out of weather (rain/snow can damage)
• Some generators have weather-resistant features; check spec

Refueling:

• Generator must be COOL (15-30 minutes after shutdown)
• Refueling hot generator = fire risk
• Outside, away from ignition sources

Connection methods (most dangerous topic)

Method 1: Extension cords (safest portable)

• Generator outside; extension cords to appliances inside
• 12-gauge minimum, 50-100 ft maximum
• Heavy-duty outdoor cords only
• Run cords under door if needed (with door slightly open + sealed)
• Each appliance: one cord (don't daisy-chain)

Method 2: Generator transfer switch (proper installation)

• Permanent transfer switch at panel
• Generator plugs into outlet, transfers selected circuits
• installed
• Safe + code-compliant
• See: Transfer Switch Installation HowTo

Method 3: Generator inlet (with transfer switch)

• Inlet box (outdoor receptacle) connects to transfer switch
• Generator cord plugs into inlet
• Better than other methods for ease + safety

What NEVER to do (illegal, dangerous):

Backfeed:

• Plug generator cord into outlet
• Generator energizes home wiring
• Generator output goes BACKWARD through panel into utility lines
• Lineman repairing utility lines gets electrocuted by your generator
• CRIMINAL CHARGES POSSIBLE if a lineman dies from your backfeed
• ILLEGAL EVERYWHERE

If a customer is doing this, intervene + recommend transfer switch ASAP.

Reverse-plug "suicide cord":

• Plug with male ends on both sides
• Plugs into generator + into outlet
• Same backfeed risk + creates exposed energized prongs
• ILLEGAL + deadly

Fuel handling

Gasoline:

• Approved fuel containers only
• 5-gallon max per container
• Fresh fuel (degrades in 3-6 months without stabilizer)
• Stored in well-ventilated area
• Away from ignition + heat sources
• Generator shutdown + cool before refueling

Propane:

• Tank in vertical orientation
• Approved tank fittings
• Storage outdoors only

Diesel:

• Less flammable but still hazardous
• Approved containers

Operating procedure

Starting:

1. Place generator outside, 20+ ft from home
2. Connect fuel if not direct-connected
3. Open fuel valve
4. Set choke ON
5. Pull start cord OR turn key
6. Allow warmup (1-2 minutes)
7. Set choke OFF
8. Verify smooth operation

Loading:

1. Connect heaviest load first (e.g., AC pump)
2. Wait 30 seconds for generator to stabilize
3. Add additional loads gradually
4. Never exceed generator capacity (printed on data plate)

Shutdown:

1. Disconnect loads
2. Run unloaded for 30-60 seconds (cool down)
3. Turn off fuel
4. Allow remaining fuel to burn out (carburetor) OR turn off ignition
5. Let cool before refueling

Maintenance

Before every storm season:

• Test run (5-10 minutes)
• Verify fuel: fresh, in container, accessible
• Verify oil level
• Verify spark plug functional
• Test outlet receptacles

During use:

• Check oil level every 6-8 hours of run time
• Refuel as needed (after cool down)

After use:

• Clean exterior
• Drain old fuel OR add stabilizer for storage
• Store in dry location

Long-term storage:

• Drain fuel + run dry, OR use stabilizer
• Disconnect spark plug
• Cover lightly (but allow air circulation)

Buying advice for customers

Sizing for portable:

• 3-5 kW: essential circuits only (fridge, lights, phone charger)
• 5-7 kW: above + small AC OR microwave
• 7-10 kW: above + medium AC + multiple essentials
• 10+ kW: borderline whole-house but typically standby

Features to look for:

• Electric start (vs pull start)
• Built-in fuel gauge
• GFCI outlets (required by 2020 ANSI)
• Low-oil shutoff
• Wheel kit (for portability)
• Hour meter

Brands:

• Honda, Yamaha: premium, quiet, reliable
• Generac, Kohler: mid-tier, good value
• Champion, DuroMax: budget, less refined

Honda 5kW: (premium) Generac 5kW: (mid) Champion 5kW: (budget)

Inverter generators

Newer technology:

• Cleaner power output (for sensitive electronics: laptops, TVs, medical devices)
• Quieter operation
• Higher fuel efficiency
• 25-50% premium price

Worth the premium if customer has expensive electronics OR noise concern.

Code reminders

• EPA + ANSI standards: most modern generators comply
• Carbon monoxide detection: ANSI/CSA standard now requires CO detection that shuts off generator in elevated CO situations
• Fuel cap leak: ANSI requires cap that prevents leaks

Standards from 2020 onwards represent significant safety improvement.

Customer education at install / sale

Every customer should know:

• Where generator goes (outside, 20+ ft, exhaust away)
• How long it runs on a tank (typical 5-10 hours for portable)
• Fuel handling safety
• Connection method (extension cords vs proper transfer switch)
• When to refuel (after cool-down)
• Storage for hurricane season
• CO detector check before storm season

When customer needs upgrade

If customer has portable + repeatedly uses during outages:

• Sell standby generator
• Permanently installed
• Auto-start, no refueling
• Whole-house power
• 5x cost but transforms outage experience

References

• ANSI/CSA portable generator standards
• CPSC (Consumer Product Safety Commission) generator safety
• OSHA generator safety
• Manuall internal: Generator Sizing for Residential, Generator Fuel Options Reference