I.S. EN 60990:2016

INTRODUCTION
1 Scope
2 Normative references
3 Definitions
4 Test site
      4.1 Test site environment
      4.2 Test transformer
      4.3 Earthed neutral conductor
5 Measuring equipment
      5.1 Selection of measuring network
             5.1.1 Perception and reaction (a.c.)
             5.1.2 Lot-go (a.c.)
             5.1.3 Electric burn (a.c.)
             5.1.4 Ripple-free d.c.
      5.2 Test electrodes
             5.2.1 Construction
             5.2.2 Connection
      5.3 Configuration
      5.4 Power connections during test
             5.4.1 General
             5.4.2 Equipment for use only on TN to TT
                      star power distribution systems
             5.4.3 Equipment for use on IT power
                      distribution systems including
                      unearthed delta systems
             5.4.4 Equipment for use on single-phase
                      centre-earthed power supply systems
                      or on centre-earthed delta power supply
                      systems
      5.5 Supply voltage and frequency
             5.5.1 Supply voltage
             5.5.2 Supply frequency
6 Test procedure
      6.1 General
             6.1.1 Control switches, equipment and supply
                      conditions
             6.1.2 Use of measuring networks
      6.2 Normal and fault conditions of equipment
             6.2.1 Normal operation of equipment
             6.2.2 Equipment and supply fault conditions
7 Evaluation of results
      7.1 Perception, reaction and let- go
      7.2 Electric burn
8 Measurement of protective conductor current
      8.1 General
      8.2 Multiple equipment
      8.3 Measuring method
Annex A (normative) Equipment
Annex B (normative) use of conductive plane
Annex C (normative) Incidentally connected parts
Annex D (informative) Choice of current limits
Annex E (informative) Networks for use in measurement of
                      touch current
Annex F (informative) Measuring network limitations and
                      construction
Annex G (informative) Construction and application of touch
                      current measuring instruments
Annex H (informative) Grippable part
Annex J (informative) AC power distribution systems (see 5.4)
Annex K (informative) Routine and periodic touch current
                      tests, and tests after repair or
                      modification of mains operated equipment
Annex L (normative) Performance and calibration
Annex M (informative) Bibliography
Annex ZA (normative) Normative references to international
                     publications with their corresponding
                     European publications
Figure 1 - Example of earthed neutral, direct supply
Figure 2 - Example of earthed neutral, with transformer for
           isolation
Figure 3 - Measuring network, unweighted touch current
Figure 4 - Measuring network, touch current weighted for
           perception or reaction
Figure 5 - Measuring network, touch current weighted for
           let-go
Figure 6 - Test configuration: single-phase equipment on
           star TN or TT system
Figure 7 - Test configuration: single-phase equipment on
           centre-earthed TN or TT system
Figure 8 - Test configuration: single-phase equipment
           connected line-to-line on star TN or TT system
Figure 9 - Test configuration: single-phase equipment
           connected line-to-neutral on star IT system
Figure 10 - Test configuration: single-phase equipment
            connected line-to-line on star IT system
Figure 11 - Test configuration: three-phase equipment on
            star TN or TT system
Figure 12 - Test configuration: three-phase equipment on
            star IT system
Figure 13 - Test configuration: unearthed delta system
Figure 14 - Test configuration: three-phase equipment on
            centre-earthed delta system
Figure A.1 - Equipment
Figure B.1 - Equipment platform
Figure F.1 - Frequency factor for electric burn
Figure F.2 - Frequency factor for perception or reaction
Figure F.3 - Frequency factor for let-go
Figure H.1 - Grippable part test device
Figure J.1 - Examples of TN-S power system
Figure J.2 - Example of TN-C-S power system
Figure J.3 - Example of TN-C power system
Figure J.4 - Example of single-phase, 3- wire TN-C power
             system
Figure K.5 - Example of 3-line and neutral TT power system
Figure J.6 - Example of 3-line TT power system
Figure J.7 - Example of 3-line (and neutral) IT power system
Figure J.8 - Example of 3-line IT power system
Table L.1 - Calculated input impedance and transfer impedance
            for unweighted touch current measuring network
            (Figure 3)
Table L.2 - Calculated input impedance and transfer impedance
            for perception or reaction touch current measuring
            network (Figure 4)
Table L.3 - Calculated input impedance and transfer impedance
            for let-go current measuring network (Figure 5)
Table L.4 - Output voltage to input voltage ratios for
            unweighted touch current measuring network
            (Figure 3)
Table L.5 - Output voltage to input voltage ratios for
            perception of reaction measuring network
            (Figure 4)
Table L.6 - Output voltage to input voltage ratios for
            let-go measuring network (Figure 5)

Covers measurement methods for d.c. or a.c. of sinusoidal or non-sinusoidal waveform, which could flow through the human body, and current flowing through a protective conductor.