EN 60523:1993/A2:1997

Overview

EN 60523:1993/A2:1997 is Amendment 2 to the European adoption of IEC 60523 (Direct-current potentiometers). Prepared under IEC Technical Committee 85 (measuring equipment for electromagnetic quantities), this amendment harmonizes safety, marking and information requirements for DC potentiometers with modern safety standards.

Key editorial points in the amendment include the formal adoption of IEC 61010-1 for voltage tests and other safety requirements and updates to required markings and information items. The extract provided does not include a full scope text (Scope: N/A) but documents the amendment’s safety and labelling changes.

Key Topics

• Reference to IEC 61010-1: Voltage test and other safety requirements are now covered by IEC 61010-1 (Safety requirements for electrical equipment for measurement, control and laboratory use – Part 1). Users and manufacturers should consult IEC 61010-1 for applicable test and construction criteria.
• Information requirements: New information items were added to the standard: p) Overvoltage category and q) Pollution degree. These clarify the environmental and transient voltage classifications for potentiometers.
• Markings and symbols: The amendment mandates use of the symbol for overvoltage category as specified in IEC 61010-1 (amendment 2, subclause 5.1.5). Example marking guidance is updated to show explicit entries such as CAT II and Pollution degree 1.
• Safety classification table: Table IV title C was revised to "C – Safety (see IEC 61010-1)", and legacy symbols C-1, C-2 and C-3 were deleted to avoid ambiguity.

Applications

This amendment is relevant for:

• Manufacturers of DC potentiometers who must update product documentation, markings and safety statements to align with IEC 61010-1.
• Test laboratories and compliance engineers applying voltage tests and safety verification referenced to IEC 61010-1.
• Product managers and regulatory affairs personnel preparing technical files for market access in regions using CLC/EN standards.

Practical benefits include clearer labelling for end users, consistent overvoltage and pollution classifications across measurement devices, and alignment with a widely adopted safety standard, reducing uncertainty in conformity assessment.

Related Standards

• IEC 60523 (original international standard for direct-current potentiometers)
• IEC 61010-1 (Safety requirements for electrical equipment for measurement, control and laboratory use - Part 1) - referenced by the amendment

For implementation, consult the full EN/IEC texts and the IEC TC 85 reports cited in the amendment for voting and editorial background. The extract indicates changes to markings and information; for full compliance, apply the complete normative text and referenced clauses of IEC 61010-1.