Neutral Earthing Resistors (also known as neutral grounding resistors in US influenced regions) are a key component in earth fault protection of medium voltage electricity generation and distribution systems.
Cressall NERs limit the current that would flow through the neutral point of a transformer or generator in the event of an earth fault.

Features of Cressall earthing resistors include:

  • Any current or voltage rating
  • Compliance with IEEE C57.32a (2020), Terminology and Test Procedure for Neutral Grounding Devices (formerly IEEE-32)
  • Stainless steel resistors and enclosures as standard, IP23 to IP56.
  • Type-tested standard designs (certificates available)

Options include:

  • Supply of resistor banks only for incorporation into customer’s own enclosures
  • Shock-tested marine designs
  • Provision for CTs, heaters, special cabling, etc.
  • Interlocked off-load by-pass isolators
  • Single or multiple vacuum contactors
  • High resistance grounding resistors (for use where regulations permit, e.g. some offshore installations)

DISCOVER THE FULL RANGE OF CRESSALL NEUTRAL EARTHING RESISTORS

neutral earthing modular resistors

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