3. Ohmmeters for measuring continuity
The purpose of these devices is to ensure the continuity of equipotential ground connections by checking that their resistance does not exceed certain thresholds.
3.1 Measurement conditions prescribed by standards
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As far as electrical installations are concerned, NF C 15-100 standard, chapter 612-2, recommends using a current greater than or equal to 0.2 A with a supply voltage of between 4 and 24 V DC. For its part, standard NF EN 61557-4-44 specifies that the measurement range must comprise at least the 0.5 to 3 Ω range and that, in this area, the operating error must be less than 30%. The error limit considered here is the statistical uncertainty; this involves not only the intrinsic error, but also any variations caused by influencing...
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Ohmmeters for measuring continuity
Measuring earth resistances
Bibliography
References
Standardization
French standards (NF) AFNOR (Association française de normalisation)
- Installations électriques à basse tension. - NF C 15-100 - déc. 2002
- Travaux sous tension. Détecteurs de tension. Partie 5 : systèmes détecteurs de tension (VDS). Indice de classement C 18-310. - NF EN 61243-5 - juin 2002
- Degrés de protection...
Manufacturers
Chauvin-Arnoux http://www.chauvin-arnoux.com
French instrumentation http://www.distrame.fr
LEM (Experts in Measuring Electricity) http://www.lem.com
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