What Is the Difference Between IP65 and IP66 Electrical Enclosures?

IP ratings define the degree of protection an electrical enclosure provides against solid particles (first digit) and water ingress (second digit). Both IP65 and IP66 enclosures offer full dust protection, but they differ significantly in water resistance.

IP Code Breakdown

• First digit 6: Dust-tight. No ingress of dust; complete protection against contact with internal live parts. This applies to both IP65 and IP66.

• Second digit: Water protection level.

◦ 5: Protected against low-pressure water jets from any direction. Limited ingress permitted, no harmful deposit.

◦ 6: Protected against high-pressure powerful water jets from any direction. No harmful water ingress.

IP65 Electrical Enclosure

• Water test: Low-pressure spray jets from all angles.

• Application: Indoor installations, outdoor locations with occasional light rain splash. Not suitable for high-pressure washing.

• Typical use: Electrical control box, junction box, distribution box, indoor OEM equipment housings.

• Key note: Can withstand rain splashes, but high-pressure water cleaning may push water through seals.

IP66 Electrical Enclosure

• Water test: High-pressure, heavy water jets from any direction.

• Application: Outdoor environments, sites requiring regular high-pressure washdown, dusty factories, coastal areas.

• Typical use: Field electrical cabinets, machine enclosures, equipment exposed to heavy rain or wash cleaning.

• Key note: Stronger sealing structure, designed to resist powerful water jet impact.

How to Choose

- Pick IP65 : Indoor /outdoor cabinets, equipment sheltered from direct heavy washing; cost-effective for normal splash protection.

- Pick IP66 : Equipment needs to endure heavy rain, outdoor exposure or periodic high-pressure cleaning. IP66 usually costs slightly higher due to upgraded sealing design.

Both IP65 and IP66 metal enclosures keep dust out. The main difference lies in water jet resistance. Confirm your site weather and cleaning method before selecting the protection grade for your custom sheet metal enclosure.