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CPC sizes historical
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<blockquote data-quote="flying_fox" data-source="post: 274083" data-attributes="member: 19833"><p>Hi (first post)</p><p></p><p>Doing an EICR on a commercial property built circa 1980 (probably deigned 1978/1979).</p><p></p><p>The majority of the wiring appears to be from that initial date but some work has been done since installation.</p><p></p><p>The wiring is mostly run as separate cores in conduit and trunking.</p><p></p><p>Looking at single phase 32 amp ring circuits, being run from consumer units, the CPC appears to be 1mm^2 rather than 1.5mm^2 (measured using vernier for confirmation).</p><p></p><ol> <li data-xf-list-type="ol">Was this a recommended/prefered size for the CPC?<br /> </li> <li data-xf-list-type="ol">Was this size of CPC correctly sized in accordance with the regulations applicable at the time of installation?<br /> </li> <li data-xf-list-type="ol">Could this size be correct if specified by the designer with supporting calculations?<br /> </li> <li data-xf-list-type="ol">What version of the regs were pertinent at that time?<br /> </li> </ol><p></p><p>Measuring the PFC at the board indicated about 1KA.</p><p></p><p>Any assistance/information would be appreciated.</p><p></p><p>Thanks in advance.</p></blockquote><p></p>
[QUOTE="flying_fox, post: 274083, member: 19833"] Hi (first post) Doing an EICR on a commercial property built circa 1980 (probably deigned 1978/1979). The majority of the wiring appears to be from that initial date but some work has been done since installation. The wiring is mostly run as separate cores in conduit and trunking. Looking at single phase 32 amp ring circuits, being run from consumer units, the CPC appears to be 1mm^2 rather than 1.5mm^2 (measured using vernier for confirmation). [LIST=1][*]Was this a recommended/prefered size for the CPC? [*]Was this size of CPC correctly sized in accordance with the regulations applicable at the time of installation? [*]Could this size be correct if specified by the designer with supporting calculations? [*]What version of the regs were pertinent at that time? [/LIST] Measuring the PFC at the board indicated about 1KA. Any assistance/information would be appreciated. Thanks in advance. [/QUOTE]
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