All countries in the world have special regulations for testing and approvals of low voltage installations. In many countries these regulations are prescribing installers, inspectors etc. to check the electrical installation periodically.
The basis for the local regulations is in many occasions the IEC/EN 60364 “Electrical installations of Buildings”. In relation to this regulation, all important parts of a LV-installation need to be approved.
Prescribed tests that need to be performed are:
  • RCD test
  • Insulation resistance test
  • Earth loop impedance test
  • Earth loop resistance test (Rs-test)
  • Earth resistance test
Obviously, values such as voltage and frequency are part of every test as well. Secondly, the regulation EN 50110 “Operation of electrical installations” is translated and formed to many national regulations. This regulation is specifically for operation or maintenance of low voltage installations and distribution systems. These installations are mostly in housings, factories or office buildings.
Besides the regulations, the growing number of ‘aging’ installations as well as the increased product liability are important reasons to test all parts of installations thoroughly.
In order to test all necessary components of any installation and to perform all tests within the regulations, Nieaf-Smitt is offering several installation testers. There are individual testers for parts of the regulation and four combination testers.



Accessories for installation testers

Accessories for installationtesters

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New product

RCT-C Earth leakage switch tester

  • Contact current of the ALS
  • IF response time
  • Testing of Normal and Selective circuit breakers
  • Start at 0 or 180 degrees
  • Voltage detection phase - earth
  • Test current of 10/30/100/300/500 and 650mA
  • Two-colored display with background lighting

IRT-C Insulation resistance tester


The insulation resistance tester IRT-C is engineered for accurate measuring of LV-installations and appliances according the EN 61157 regulation. The tester has been developed to measure voltage and continuity.


ELT-S Earth circuit impedance tester


Digital Earth Loop resistance and netimpendancemeter without tripping the RCD. Internal memory for 500 measurements. RS232 output. Incl. set of test leads.



626000256 (NL version, UK on demand)

Digital earth resistance meter for all field measurements. Internal memory for 500 measurements. RS232 output. Incl. set of test leads.


Instaltest AT


Multifunction installation tester with Autotest. Up to 5 times faster testing, reports can be generated with the supplied software. Testing according to EN 50110 and NEN 1010.


Instaltest XE

  • Insulation resistance
  • Continuity
  • Contact voltage of the RCD
  • Trip time of the RCD
  • Automatic RCD test
  • Trip current of the RCD
  • Earthloop impedance without tripping RCD
  • Phase rotation
  • Earth resistance
  • Line impedance (Z-line)
  • Earthloop impedance (Z-loop)
  • Voltage
  • Earth resistance