What Are GFCI and AFCI — And What’s the Difference?

If you’ve looked inside your electrical panel or at certain outlets in your home, you’ve probably seen the terms GFCI and AFCI. They’re both safety devices—but they protect you in completely different ways.

Understanding the difference is critical, especially under CEC 2024 requirements in Canada.

When a hairdryer, connected to power, falls into water, it poses a serious shock hazard.

What Is a GFCI?

A Ground Fault Circuit Interrupter (GFCI) protects people from electric shock.

It constantly monitors the current flowing in the hot and neutral wires. If it detects even a small imbalance (as low as 5 mA), it shuts off power instantly.

Where GFCIs Are Used:

• Bathrooms

• Kitchens

• Garages

• Outdoor outlets

• Anywhere near water

What It Protects Against:

• Electric shock

• Ground faults (electricity leaking to ground)

👉 Typical example:If a hairdryer falls into water, a GFCI trips immediately to prevent serious injury.

When an arc happens, it may cause a fire hazard.

What Is an AFCI?

An Arc Fault Circuit Interrupter (AFCI) protects your home from electrical fires.

It detects dangerous electrical arcing—tiny sparks caused by damaged wires, loose connections, or worn insulation—and shuts off the circuit before a fire can start.

Where AFCIs Are Required:

• Bedrooms

• Living rooms

• Hallways

• Most general living areas

What It Protects Against:

• Electrical fires

• Hidden wiring damage

• Loose or deteriorated connections

👉 Typical example: A damaged wire inside a wall starts arcing. An AFCI detects this and trips before it turns into a fire.

Key Differences (Simple Breakdown)

Feature	GFCI	AFCI
Main Purpose	Protect people	Prevent fires
Detects	Ground faults	Arc faults
Trip Sensitivity	Very small leakage (≈5 mA)	Abnormal electrical patterns
Common Locations	Wet areas	Living spaces

Do You Need Both?

Yes—in many cases, both protections are required.

Modern electrical codes often require:

• AFCI protection for most circuits

• GFCI protection where water is present

In some installations, you’ll see dual-function breakers that combine both protections into a single device.

When to Upgrade

You should consider upgrading if:

• Your panel is older and lacks AFCI breakers

• You’re renovating or adding new circuits

• You want to improve safety beyond the minimum code

Bottom Line

• GFCI = protects YOU from shock

• AFCI = protects your HOME from fire

Both are essential layers of protection in a modern electrical system.

To see if your outlets and system are protected by any GFCI or AFCI protecting device, you can read this article or contact us to assess your home wiring.