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Street Light Question
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<blockquote data-quote="streetlighter" data-source="post: 308270" data-attributes="member: 48"><p>Some very old pole bracket installations as in mounted to wooden electricity poles have no connection to Earth !</p><p></p><p>The terms CNE and SNE are what you get taught by the DNO on the ERG39 course. Most board services in new installations are TN-C-S the older installs that are usually concrete columns are mainly TN-S.</p><p></p><p>Different local authoritys have there own rules about whats acceptable on there network. Like in Cheshire on a board serviced column we would fit above the DNO cutout a charles en direct double pole isolator unit with 6mm insulated tails and a 6mm main earthing conductor and a 6mm earth to the column but you never earth the column door.</p><p></p><p>In warrington they lash the twin and earth from the lantern in the DNO cutout and have a 6mm earth to the column and earth the door too.</p></blockquote><p></p>
[QUOTE="streetlighter, post: 308270, member: 48"] Some very old pole bracket installations as in mounted to wooden electricity poles have no connection to Earth ! The terms CNE and SNE are what you get taught by the DNO on the ERG39 course. Most board services in new installations are TN-C-S the older installs that are usually concrete columns are mainly TN-S. Different local authoritys have there own rules about whats acceptable on there network. Like in Cheshire on a board serviced column we would fit above the DNO cutout a charles en direct double pole isolator unit with 6mm insulated tails and a 6mm main earthing conductor and a 6mm earth to the column but you never earth the column door. In warrington they lash the twin and earth from the lantern in the DNO cutout and have a 6mm earth to the column and earth the door too. [/QUOTE]
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