Custom earthing resistance (NER / NGR)

Performance, safety and reliability in demanding environments


The electrical distribution networks are often the subject of fortuitous faults . In other words, following occasional circumstances, without apparent cause.
It is therefore essential to install protection systems .

METAL DEPLOYE RESISTOR offers a neutral point resistance range , or earthing resistance (MALT) depending on your electrical needs and your environments ( NER / NGR ).

Earthing resistance (MALT)

What are the protection systems for electrical distribution networks?

3 types of “neutral” protection

The type of protection depends on the treatment of the neutral line, which can be done via 3 different methods:

  1. Isolated neutral : for small size and low voltage networks
  2. Direct earthing of neutral : 20 to 30 times the value of the nominal current
  3. Earthing of the neutral line with current limitation default

Advantages of protection with resistance ”

Only methods using resistance allow:

  • quick and easy fault detection
  • to offer reference potential whose stability is suitable
  • current control artificially created short circuit
  • maximum security for the environment
Wind farm

Our range of earthing resistors (MALT)

Earthing resistors for any application: NER / NGR

We offer different types of “general” resistors and specific to certain applications:

Neutral earth resistance
Neutral earth resistance

Possibility of integrating all types of accessories

Our resistors can integrate all kinds of accessories: CT, control elements, SIGMA Relay, contactors, switches….

Internal earthing resistance
country of intervention
3 707
implemented projects
1 507
international clients

French design and manufacturing
World leader in tailor-made resistors

A tailor-made, technical and reliable response for all application sectors

Petrochemical oil refinery plant

For multiple applications, often with demanding constraints and located throughout the world, METAL DEPLOYE RESISTOR provides a suitable technical solution:

Earthing resistors designed in compliance with current standards

All METAL DEPLOYE RESISTOR earthing resistors are designed in accordance with EC289 and EEE32-1972 standards .

Indeed, these standards define a maximum admissible temperature of the resistor according to the duration of the fault.

This temperature for resistant stainless steel elements is 760 ° C for a short-term fault.

METAL DEPLOYE RESISTOR, is at your disposal to define the specific parameters linked to your needs.

Our range of resistors meets the international standards .