Is Your Breaker Box Waterproof?

Are you concerned that your breaker box seems to be getting wet? In some areas, local regulations require that the breaker box be installed outside the home. In this case, homes should have a waterproof circuit breaker box. Water in and around an electrical box is dangerous and should be avoided. Moisture can get into the box through condensation and leaks.

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Are Breaker Boxes Waterproof?

An indoor breaker box is most likely not waterproof, while outdoor types are usually water-resistant. When it comes to waterproof electric boxes, the terms waterproof and water-resistant mean almost the same thing. The breaker box must cope with all types of weather including rain, sleet, snow and ice without allowing water inside the box.

This type of electric box will typically have a NEMA Type 3R water-resistant rating that's suitable for outdoor use. You can also get NEMA Type 4 enclosures that are waterproof even when sprayed by a powerful hose, but these aren't commonly used for breaker boxes.

Where Is My Breaker Box?

The location of the breaker box depends on the local electrical code. Over the last 20 years, many authorities have specified that the breaker box must be placed on an outside wall for new or renovated homes. It will usually be where the electrical supply comes into the house. This is so the fire department can easily reach an outdoor breaker box to disconnect the electrical supply in case of a fire or flooding.

If your home is older or you live in a state that has no requirements above the National Electrical Code (NEC), the electrical box may be inside the home. You'll often find it in a utility room or basement.

What Happens If a Breaker Box Gets Wet?

If you have an indoor breaker box that gets wet, you should immediately disconnect the power if it's safe to do so and call an electrician. Don't touch any metal components, as you risk a dangerous electrical shock.

With a weatherproof outdoor panel, it's fine if the outside gets wet. But if the cover leaks or water somehow gets inside the breaker box, don't touch it. There's a risk of shock, short circuit or electrical fire. In that case, call an electrician or the local utility company. Be especially careful of water on the ground around the panel, as this may increase the risk of a dangerous electrical shock.

Can You Install a Waterproof Circuit Breaker Box?

If you're a licensed electrician, you can install a breaker box yourself. If you aren't, you need to get a licensed, insured contractor to do the installation.

A waterproof switch box is essential if it's outside or there's any risk of the breaker box getting wet. Always make certain the breaker box has a minimum NEMA Type 3R rainproof rating. The box must have a lid or door fitted with weatherproof seals to prevent the ingress of water. Make certain all cable entries are properly sealed, and avoid any openings on the top of the box, as they're difficult to seal. Keep the box closed except when using it.

For added protection, you might consider a NEMA Type 4 electrical box that's totally waterproof. These provide added protection but are more expensive and less readily available.

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How Much Does a Waterproof Circuit Breaker Box Cost?

The cost of a NEMA 3R waterproof circuit breaker panel varies on average from $101 (CAD 140) for a 125 Amp 12 space unit up to $722 (CAD 1,003) for a 225 Amp 42 space electric box. You need to add the cost of installing the panel and auxiliary equipment such as circuit breakers and wiring. The average cost to replace a 200 Amp electrical panel, including additional requirements such as permits, wiring and labor costs, can range from $520 to $2,900 (CAD 722 to CAD 4,030).

Protecting Your Family With a Waterproof Breaker Box

If you have an outdoor breaker box, it must be waterproof or water-resistant. You can tell whether you have a waterproof circuit breaker box by looking for the NEMA rating, which should be stamped on the panel. The minimum outdoor panel ratings are NEMA 3 or NEMA 3R. But if there's any doubt, contact an electrician and ask them to inspect the panel to confirm its rating.

All CAD conversions are based on the exchange rate on the date of publication.