Neutral Earthing Enclosures
Neutral Earthing Enclosure IP ratings
A well-ventilated neutral earthing enclosure allows more rapid cooling and so for a given duty less resistor material is required. Given that the materials inside the resistor enclosure are stainless steels, ceramics and ceramic insulators, all suitable for unprotected outdoor use, we consider that enclosure ratings of IP23 are the right balance between good ventilation and the need to keep out birds and animals. We do also offer IP54 to IP56 enclosures where requested, either with or without filtration.
After a full fault some parts of a neutral earthing enclosure may be hazardously hot. The effects of this can be mitigated by labelling, by ventilation design, by enclosure construction or by the addition of heat shields that keep the hot parts out of reach. Bearing in mind that substations are not heavily populated and that faults are rare and never full duration, a solution that does not add disproportionate cost is obviously wanted: we consider that large, clear warning labels (Danger: hot surfaces) are the best approach.