BSI PD IEC TR 63167:2018
$142.49
Assessment of contact current related to human exposure to electric, magnetic and electromagnetic fields
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 26 |
This document, which is a Technical Report, provides general information on the assessment of contact current related to human exposure to electric, magnetic and electromagnetic fields. The contact currents in this context occur when a human body comes into contact with a not electrified conductive object exposed to an electric and/or magnetic field at a different electric potential owing to electric and/or magnetic induction to the object. This is distinguished from the issue of electrical safety where contact with live parts of a conductive object is dealt with.
In reference to the international EMF guidelines [1]-[4]1, the frequency range of contact current covered in this document is direct current to 110 MHz, and only steady-state (continuous) contact currents are covered. Transient contact currents (spark discharges) which may occur immediately before the contact with the object are not covered.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | CONTENTS |
| 6 | FOREWORD |
| 8 | INTRODUCTION |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Abbreviated terms 5 Contact current in EMF exposure guidelines |
| 11 | 6 Consideration in evaluating contact currents 6.1 General 6.2 Assumed situations of human exposure to contact current 6.2.1 General 6.2.2 Capacitive coupling (power line) 6.2.3 Inductive coupling (power line) 6.2.4 Induction heating equipment |
| 12 | 6.2.5 Wireless power transfer (WPT) 6.2.6 Broadcasting 6.3 Methods of measurement of touch current used in electrical safety standards 6.3.1 General 6.3.2 IEC standards related to electrical safety |
| 13 | Tables Table 1 – Selected IEC technical committees and standards related to electrical safety |
| 14 | 6.3.3 Modelling human body impedance Figures Figure 1 – Time/current zones of effects of alternating currents (15 Hz to 100 Hz) on persons for a current path corresponding to left hand to feet(for explanation see Table 2) Table 2 – Time/current zones for alternating current 15 Hz to 100 Hzfor hand to feet pathway – Summary of zones in Figure 1 |
| 15 | Figure 2 – Measuring network for unweighted touch current [16] |
| 16 | Figure 3 – Measuring network for touch current weighted for perception or startle-reaction [16] Figure 4 – Simulated body impedance for contact current measurements shown in IEEE C95.3 [27] |
| 17 | 6.4 Proposed methods of measuring contact current 6.4.1 General 6.4.2 Contact current measurement using a human subject Figure 5 – Impedances of various parts of the body proposedin IEC TS 62996 for 1 kHz to 6 MHz [11] |
| 18 | 6.4.3 Contact current measurement using a human equivalent impedance/circuit 6.4.4 Contact current calculated from measurement of open-circuit voltage |
| 19 | 7 Consideration in standardization of evaluation method for contact current Figure 6 – Realistic computational 3D human body model and results of calculation of current density and pathway |
| 20 | Annex A (informative)Contact current limits in international EMF guidelines Table A.1 – Reference levels in ICNIRP guidelines for time varying contact current from conductive object [1], [2] Table A.2 – Maximum permissible exposure (MPE) levels of contact current in IEEE safety standards [3], [4] |
| 22 | Bibliography |
