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The best way to determine whether a conductive part is likely to introduce Earth potential is visual inspection. If it is not possible to determine by visual inspection alone, then a measurement of resistance to Earth can be obtained to determine if the conductive part in question is to be considered an extraneous-conductive-part.
To assess whether Earth potential is liable to be introduced by a conductive part that is connected to the general mass of Earth through a resistance, a measurement should be made of the resistance (R CP) between the conductive part and the main earthing terminal of the installation.
It can sometimes be difficult to determine if a metallic part meets the requirement. This can be overcome by breaking the definition into the three separate parts: A conductive part. Liable to introduce potential, generally earth potential, and; Not forming part of the electrical installation.
For example, if it’s metallic and in contact with Earth, it’s likely to meet the definition of an extraneous-conductive-part. It’s defined in Part 2 of BS 7671:2018 as: ‘a conductive part liable to introduce a potential, generally Earth potential, and not forming part of the electrical installation.’
Dec 3, 2019 · Note 2: Extraneous-conductive-part = a conductive part liable to introduce a potential, generally earth potential, and not forming part of the electrical installation, eg, metallic gas service pipe. Therefore, MDPE gas service pipes generally do not require PEB.
technical parameters associated with earth potential rise (EPR). ENA TS 41-24 provides the overall rules, the design process, safety limit values and links with legislation and other standards.
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11 the technical parameters associated with earth potential rise (EPR). 12 ENA TS 41-24 provides the overall rules, the design process, safety limit values and links with 13 legislation and other standards.
