1.1.1 This standard applies to the following apparatus, whether or not designed for mains supply:
— electronic measuring apparatus;
— accessories used with electronic measuring apparatus, including auxiliary apparatus and supply apparatus;
— electronic accessories for non-electronic measuring instruments.
1.1.2 This standard applies to apparatus for indoor use.
The conditions for indoor use are specified by the Usage Group I of I EC Publication 359, the basic climatic conditions of which are:
— temperature from +5 °C to +40 °C;
— altitude up to 2 200 m;
— relative humidity up to 80%.
These values indicate the conditions of safe operation of apparatus designed and tested in accordance with this standard. Such apparatus may occasionally be subjected to temperatures between +5 °C and —10 °C without degradation of their safety.
Requirements for apparatus to be used under the more severe environmental conditions of Usage Group II or III may be dealt with in the future.
For apparatus to be used in special areas, such as coal mines or aircraft, also to drip-proof or splash-proof apparatus, different or additional requirements may apply.
1.1.3 This standard does not apply to electronic measuring apparatus in medical diagnostic and therapeutic applications. The requirements for such apparatus are contained in IEC Publication 601-1: Safety of Medical Electrical Equipment, Part 1: General Requirements.
1.1.4 For electronic measuring apparatus used in connection with ionizing radiation, additional requirements are contained in IEC Publication 405.
1.1.5 This standard may not be appropriate for:
a) some types of direct indicating instruments and some types of recording instruments, or parts of them, containing electronic devices (see Sub-clause 3.2);
b) apparatus designed for a rated supply voltage exceeding:
— 480 V (r.m.s.) between phases for apparatus for three-phase supply,
— 250 V (r.m.s.) for all other apparatus;
c) electronic apparatus whose measuring function is used exclusively for control purposes.
1.1.6 This standard is concerned with safety only and not with the other properties of electronic measuring apparatus (see Clause 3).
1.1.7 Throughout this standard:
a) the term "apparatus" is used to cover any apparatus or accessories specified in Sub-clause 1.1.1;
b) the terms voltage and current indicate r.m.s. or d.c. values unless otherwise specified;
c) reference should be made to Appendix D for the full titles of IEC publications.