IK ratings measure an enclosure's resistance to mechanical impact, defined by IEC 62262. The scale runs from IK00 (no protection) to IK10 (20 joules, equivalent to a 5kg mass dropped from 40cm). The most commonly specified ratings for electrical products are IK07 (2 joules), IK08 (5 joules), and IK10 (20 joules).
The standard: IEC 62262
IK ratings are defined by IEC 62262 (EN 62262 in Europe). The standard was first published in 2002 and provides a classification system for the degree of protection provided by enclosures against external mechanical impacts.
While IP ratings tell you what can get into an enclosure (dust and water), IK ratings tell you what happens when something hits the enclosure from outside. The two ratings are complementary. A product can be IP65 (dust-tight, jet-proof) but only IK07 (2 joules of impact protection). Or it can be IP20 (finger-proof only) but IK10 (20 joules).
The IK rating table
| IK Code | Impact energy (joules) | Equivalent impact | Mass x drop height |
|---|---|---|---|
| IK00 | Not protected | -- | -- |
| IK01 | 0.14 J | Negligible | 0.25 kg from 56 mm |
| IK02 | 0.2 J | Very light | 0.25 kg from 80 mm |
| IK03 | 0.35 J | Light | 0.25 kg from 140 mm |
| IK04 | 0.5 J | Light | 0.25 kg from 200 mm |
| IK05 | 0.7 J | Moderate | 0.25 kg from 280 mm |
| IK06 | 1 J | Moderate | 0.25 kg from 400 mm |
| IK07 | 2 J | Significant | 0.5 kg from 400 mm |
| IK08 | 5 J | Heavy | 1.7 kg from 300 mm |
| IK09 | 10 J | Very heavy | 5 kg from 200 mm |
| IK10 | 20 J | Severe | 5 kg from 400 mm |
The scale is not linear. The jump from IK07 (2J) to IK08 (5J) is 2.5x the energy. The jump from IK08 (5J) to IK10 (20J) is 4x the energy. Each step up represents a substantially more robust enclosure.
What the joule values mean in practice
Numbers like "5 joules" and "20 joules" are abstract. Here are practical equivalents:
IK07 (2 joules): Roughly equivalent to a 500-gram steel ball dropped from 40 centimeters. This is the impact you would expect from a hand tool accidentally striking an enclosure during installation. A screwdriver slipping off a screw or a cable drum bumping into a wall-mounted box.
IK08 (5 joules): Roughly equivalent to a 1.7-kilogram mass dropped from 30 centimeters. This handles accidental impacts from moving equipment, trolleys bumping into wall-mounted enclosures, and moderate vandalism attempts. A fist punch delivers approximately 5-10 joules.
IK10 (20 joules): Roughly equivalent to a 5-kilogram steel mass dropped from 40 centimeters. This handles deliberate abuse, heavy tool impacts, and impacts from moving vehicles in warehouse environments. A hammer blow at moderate force delivers approximately 15-25 joules. IK10 is the highest standard rating.
How the test works
IEC 62262 specifies a pendulum hammer test or a free-fall test. The test piece (the complete enclosure with its normal mounting arrangement) is struck at the points most likely to be vulnerable, typically flat surfaces and at seals or joints.
For ratings IK01 through IK06, the test uses a 0.25 kg hemispherical steel striker. For IK07, a 0.5 kg striker. For IK08 through IK10, the striker mass and drop height increase as shown in the table above.
The test is performed at 5 impact points (or more, depending on the enclosure shape) with one impact per point. After testing, the enclosure must still provide its rated IP protection. If a dust-tight IP65 enclosure is rated IK10, it must remain IP65 after receiving the IK10 impacts. If the enclosure cracks, deforms, or allows ingress after the impact test, it fails.
Where IK ratings matter in electrical distribution
Luminaires
IK rating is a critical specification for commercial and industrial luminaires. A recessed ceiling luminaire in an office might only need IK02. A surface-mounted luminaire in a parking garage needs IK08 or IK10 because it will be struck by vehicles, shopping carts, and sports equipment.
Common luminaire IK ratings:
| Application | Typical IK rating |
|---|---|
| Office recessed downlight | IK02-IK04 |
| Corridor and stairwell | IK07-IK08 |
| Parking garage | IK08-IK10 |
| Sports hall | IK10 |
| Prison / psychiatric facility | IK10+ (anti-ligature) |
| Outdoor public area | IK08-IK10 |
Enclosures and distribution boards
Wall-mounted distribution boards in residential settings may not specify an IK rating (or specify IK07 as standard). In commercial and industrial settings, IK08 or IK10 is common for floor-standing cabinets and boards mounted at accessible heights.
Switches and sockets
Industrial switches and sockets (Schuko, CEE, etc.) in factory environments often specify IK07 or IK08. Surface-mounted weatherproof sockets for construction sites frequently carry IK08 ratings.
Smoke detectors and safety devices
Smoke detectors in public buildings and custody environments often require IK04 to IK07 to prevent tampering or accidental damage.
IK ratings in product data
IK rating is an increasingly important filterable attribute in electrical product catalogs, especially for luminaires and enclosures. Many project specifications now require a minimum IK rating alongside the IP rating.
Common data quality issues
Missing IK ratings. Many suppliers do not include IK ratings in their data feeds, even when the product has been tested. This forces distributors to look up the rating from the product data sheet.
Confusing IK with IP. The "I" in both stands for a different word (Impact vs Ingress). Some systems accidentally store IP ratings in IK fields and vice versa. A value of "65" in an IK field is clearly an IP rating, since IK ratings only go to 10.
Non-standard formats. IK ratings appear as "IK08," "IK 08," "IK8," "08," or "8" in different supplier feeds. Normalize to the two-letter prefix plus two-digit code: IK08, IK10.
Validate IK codes in your catalog using the free IK rating validator. It checks the format and confirms the rating falls within the IK00-IK10 range defined by IEC 62262.
Beyond IK10
Some applications require impact protection beyond the IK10 standard. Anti-vandal luminaires for prisons, psychiatric facilities, and high-security areas are sometimes marketed as "IK10+" or "exceeds IK10." There is no official IK11 or higher rating in IEC 62262. Products claiming performance beyond IK10 are using proprietary test methods, which may involve heavier masses, repeated impacts, or different striker geometries.
When you encounter "IK10+" in product data, store it as IK10 for filtering purposes but note the enhanced rating in the product description. Use the IK rating validator to ensure the base rating is correctly formatted.