Cressall – power resistors designed and manufactured in the UK for a global market. Cressall have been in the electrical engineering business almost from the start of electrical engineering. Thanks to the achievements of those early pioneers, and their successors, Cressall is still the leading British company in its field a hundred years later. Cressall neutral earthing resistors (NERs) are employed in AC distribution networks to limit the current that would flow through the neutral point of a transformer or venerator in the event of an earth fault. The rating of an NER is chosen to meet the requirements of the system protection scheme; this will include consideration of maximum acceptable fault current, earth potential levels, and preventing damage caused by the fault.