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Economy 7 - historic wiring
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<blockquote data-quote="Mark56" data-source="post: 526571" data-attributes="member: 34997"><p>Thank you for your replies.</p><p></p><p>Is it like this? </p><p></p><p>Originally, when E7 was introduced, the time switch was in the meter (as per stuboy). </p><p></p><p>The meter fed power to two consumer units/DBs:</p><ol> <li data-xf-list-type="ol">An E7 CU. This fed power to the storage heaters and immersion heaters. There was no need for timer switches on the appliances as they would be switched on by the meter at the right time.</li> <li data-xf-list-type="ol"> A general purpose CU that fed power everywhere else.</li> </ol><p>During E7 time, all power use, via either CU, would be charged at the E7 rate. So, heaters automatically switched on but lights and kettles still work on E7 rate.</p><p></p><p>Now things have changed as meters are electronic and there is no need to have two CUs connected to the meter as it is easy enough to add time switches to the appliances. With appliances on timers, the E7 can be used to heat water or storage heaters without the need for a separate CU.</p><p></p><p>(I see the point that without storage heaters it is hard to justify E7, which is probably why it is being phased out.)</p></blockquote><p></p>
[QUOTE="Mark56, post: 526571, member: 34997"] Thank you for your replies. Is it like this? Originally, when E7 was introduced, the time switch was in the meter (as per stuboy). The meter fed power to two consumer units/DBs: [LIST=1] [*]An E7 CU. This fed power to the storage heaters and immersion heaters. There was no need for timer switches on the appliances as they would be switched on by the meter at the right time. [*] A general purpose CU that fed power everywhere else. [/LIST] During E7 time, all power use, via either CU, would be charged at the E7 rate. So, heaters automatically switched on but lights and kettles still work on E7 rate. Now things have changed as meters are electronic and there is no need to have two CUs connected to the meter as it is easy enough to add time switches to the appliances. With appliances on timers, the E7 can be used to heat water or storage heaters without the need for a separate CU. (I see the point that without storage heaters it is hard to justify E7, which is probably why it is being phased out.) [/QUOTE]
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