ETAS is electrical installation testing, analysis, reporting and management software for Windows.

Users of ETAS currently include electrical contractors, building owners, facility services companies, maintenance teams, and site managers.

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Save Money

  • No software or support subscription costs, licencing fees, per-seat costs, nag screens or license keys
  • Free download, fully functional except for final report/certificate generation
  • Flexible pricing — the inspector only pays for the reports that they generate

Save Time

Huge time savings for both inspector and reviewer even on the smallest installations.

  • Automatic flagging of over 100 symptoms of potential non-compliance
  • Hundreds of searchable and customizable observation templates with default category codes
  • Semi-automated entry of the lengthy Summary of Inspection based on observations recorded
  • Fast data entry features, including missing field locator and circuit copy & paste
  • Multiple inspectors can work in parallel and merge datasets later

Leverage Test Data

Any recipient of a signed-off report or certificate can, without compromising the report or certification carried out by a third party, download ETAS for free and use it to:

  • Search for, identify and track electrical assets
  • Manage multiple certificates across multiple installations
  • Save time and cost at retest by exporting asset data from a previous report/certificate
  • Maintain an accurate history of an electrical installation


ETAS is designed to record electrical installations in much greater detail than comparable software. This enables it to:

  • Identify potential non-compliances
  • Perform on-the-fly calculations to aid engineers while testing
  • Provide end-users with a more accurate record of the system
  • Generate the most comprehensive and detailed reports/certificates on the market View a sample

How much time do you as an inspector or reviewer spend verifying the test data and findings against the regulations?

ETAS can save you hours, if not days, when verifying large installations. For every non-compliance detected ETAS suggests a default, yet customisable, observation and category code.

TT Earthing Systems

Anywhere a TT system is employed on the installation verify that:

  • Electrical equipment (including the main RCD(s) and conductors) is not enclosed in an exposed conductive part
  • All live conductors (including the neutral) are isolatable
  • Maximum earth rod loop resistance complies
  • Where RCD test results are recorded against the site, that an RCD is included in the top-level piece of distribution equipment

Equipotential Bonding

Verify that:

  • Bonding conductors are present (including earthing systems exported to other buildings)
  • Bonding conductor sizes are valid with regard to the material of earthing system (TNCS, TNS or TT) and the type of conductor used as per regulation 544.1.1 and table 54.8

Calculations account for:

  • Changes in earthing system (e.g. from TN** to TT)
  • Different material bonding conductors in series (e.g. when armouring to an outside building then changes to copper)

Earth Conductor

Verify size and material in relation to the phase conductor as outlined in BS 7671 by:

  • Selection as per table 54.7
  • Adiabatic formula as per tables 51.2 to 51.6, and the earth loop reading taken at the end of the circuit

Calculations take into account:

  • Multiple earth conductors installed in parallel
  • Multiple sizes and materials of earth conductor installed in series

The end report lists the smallest size in use (equivalent in copper in the case of steel or aluminum).

Phase Conductor


  • Load in relation to the cable size, type and installation method(s) by analysing all downstream protective devices, if any, or all upstream protective devices (in both cases per phase on a multi-phase circuit).
  • Size and type of cables with regard to method of installation as per tables 4D1A to 4J4A and the size of the protective device either local to the circuit or all the way upstream to the source.

Calculations take into account multiple cables (in series and in parallel), multiple cable sizes, materials and methods of installation. The end report lists the minimum current carrying capacity cable.

Protective Device Let-Through Energy Where any protective devices in the chain afford let-through energy protection (e.g. BS88, BS1361 protective devices and some electronically controlled MCCBs), calculate and verify the let-through energy at all relevant points of insertion of a downstream protective device.

Verify all types of RCDs and RCBOs (site, fuse board or circuit), including time delay models against the results entered.

Where an RCD/RCBO has been installed on a circuit, ask the user whether the RCD protects the whole circuit (e.g. if there are exposed conductive parts between the source protective device and the RCD).

Maximum Zs Permitted by BS7671

Verify earth loop readings against the calculated maximum permissible Zs taking into account:

  • Protective device
  • Low-voltage or reduced low-voltage 110V single phase (Uo55V) or 110V 3-phase (63.5V)
  • Circuit topology (sub-main, ring or radial)
  • Type of earthing system
  • Maximum allowable disconnection time

Test Results

Verify compliance of polarity, earth continuity (CPC) of the circuit, insulation resistance, ring main continuity, board RCD/RCBO, fuseway RCBO and circuit RCD readings.


About Us

ETAS is developed by a sister company of Electrical Testing Surveyors Ltd, a UK-based company specialising in electrical testing since 1992. Our clients include:

  • Yeo Valley
  • Inchcape
  • Arnold Clark
  • ABN Plc
  • BOCM Pauls Ltd
  • WH Smith
  • British Sugar Plc
  • Rexel Group
  • Nuffield Hospitals
  • DS Smith
  • University of Exeter
  • Royal Devon & Exeter Hospital

We use ETAS exclusively to test a rich variety of installations, ranging from domestic properties to heavy industrial complexes with multiple sub-station transformers.


Spurred by changes to the 17th Edition IEE Regulations, we completely rewrote and updated our in-house software in order to offer it to other electrical contractors and testing companies.

As an added benefit for owners of complex or multiple sites, we made it freely downloadable so that users can exploit test data for maintenance and record-keeping purposes without compromising the certification or reporting carried out by third parties.

The result is ETAS, a new concept in electrical testing software.

A large number of our clients are now using ETAS to maintain their electrical installations. We believe it is the most comprehensive electrical testing software on the market!