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An Ingress Protection rating is given to a garden lighting product (garden light, transformer or junction box) to show its resistance to entry by physical objects and particles in the atmosphere and its resistance to water entering the enclosure or housing. It consists of two digits after the capital letters “IP” - the first digit is resistance to objects and particles and the second digit shows the resistance to water.
The first digit provides a measure of protection against solids - how dust or insect proof the product is:
|4||Resistance to foreign bodies down to 1mm2 – this is the minimum for an exterior fitting in order to keep insects out of the areas where live parts are located – usually the lampholder and terminal block. It also tells you that your children should not be able to poke fingers or objects other than very fine wires into a light.|
|5||Generally proof against contact and dust|
The second digit measures protection against liquids – in practice this means that lights are weatherproof enough for outdoor use with a minimum rating of 4. Ratings of 5 and 6 means they are ok in areas where you are using a hosepipe (but not pointing a pressure washer directly at the light!). 7 is where lights start to become more than weatherproof – they can be regarded as waterproof for limited immersion in water – this rating was originally for marine fittings as a ship’s deck rolled into a wave. Only the 8 rating means the light is waterproof for use in ponds, bog gardens or riverside gardens prone to flooding. So if your lawn becomes very soggy for a while after heavy rain, make sure recessed lights are IP68 rated or provide drainage beneath and away from the underside of an IP67 light – a gravel-filled trench or tile drain along the cable route is often sufficient.
|4||Splashproof – limited ingress permitted as long as it doesn’t touch live parts|
|5||Hose-proof - limited ingress permitted as long as it doesn’t touch live parts|
|6||Pressure hose proof - limited ingress permitted as long as it doesn’t touch live parts|
|7||Protection against limited immersion in water|
|8||Continuous submersion in water, usually to 2 metres|
Ingress of water can still happen to IP68 lights if:
All exterior lights, especially IP68 lights, are prone to condensation inside if they have been fitted during weather conditions which mean damp air has been trapped inside; a few drops of condensation on the underside of a lens is often mistakenly exaggerated as water getting into the light on a larger scale. If this has happened, dry the interior of the fitting with tissue, then stand the light out of water facing vertically upwards with the lamp and lens fitted but without the top plate in place; switch the fitting on for 15-20 minutes so it warms up enough to dispel any moist air. Switch off and screw the top plate in position, having either waited for the fitting to cool to a temperature suitable for safe handling or wearing thermally insulated gloves.
Copyright 2008; Information based on products supplied by Lighting for Gardens Limited and is advisory only. The company accepts no responsibility for incorrect use or application of information given. Light fittings can become hot in use; exercise appropriate precautions. Exterior electrical installations should be undertaken by a qualified electrician.