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447 Power: Difference between revisions
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There are two sets of circuits now in use: the 'old' ones already installed when we arrived, and the 'new' ones which we have added. The former are all supplied via old-fashioned fuses installed in a fusebox in the (locked) power intake room and, except for the kitchen, do not have additional (ie RCD) protection. The new circuits are connected through local distribution boards ('Consumer Units') via a new main board, all using circuit breakers (MCBs) with RCD protection on most circuits. The status of all of the breakers can be seen without opening the units. | There are two sets of circuits now in use: the 'old' ones already installed when we arrived, and the 'new' ones which we have added. The former are all supplied via old-fashioned fuses installed in a fusebox in the (locked) power intake room and, except for the kitchen, do not have additional (ie RCD) protection. Because of this lack we plan to stop using these circuits, with the exception of the ceiling lighting circuits. | ||
The new circuits are connected through local distribution boards ('Consumer Units') via a new main board, all using circuit breakers (MCBs) with RCD protection on most circuits. The status of all of the breakers can be seen without opening the units. Each local distribution board will supply power to a given allocated area, which can be seen on the plans below. | |||
===Phase allocation=== | ===Phase allocation=== | ||
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===Cable Colour Codes=== | ===Cable Colour Codes=== | ||
Once upon a time the colour codes in the UK were ''black'' neutral, ''green'' earth, ''red'' live - phase 1, ''yellow'' and ''blue'' other two live phases when using a 3-phase supply. | |||
Then along came "European Harmonization" and everything changed. In your home "''red-black-green''" became "''brown-blue-green/yellow''" and it wasn't too bad. But in the three-phase world the primary (and easily identifiable) red-yellow-blue became "''brown-grey-black''" which don't look much different in the semi-dark. | |||
Then along came "European Harmonization" and everything changed. In your home "''red-black-green''" became "''brown-blue-green/yellow''" and it wasn't too bad. But in the three-phase world the primary (and easily identifiable) red-yellow-blue+black+green became "''brown-grey-black+blue+green/yellow''", which except for the striped earth don't look much different in the semi-dark. And yes, black was now a *live* wire, not neutral. | |||
And yea, electricians up and down the land of the Angles got most distraught. Especially when they were laying steel-wire-armoured (swa) cables. | |||
At the London Hackspace we have a mix of old and new cables, used for a mix of purposes, because we try to reuse everything to reduce expenditure. This means that you must always '''check''' what a wire is being used for and NOT trust the original colour. | |||
*Where the original colours are '''red-yellow-blue''' and it is now carrying single phase then '''red=live, blue=neutral, yellow=earth''' | *Where the original colours are '''red-yellow-blue''' and it is now carrying single phase then '''red=live, blue=neutral, yellow=earth''' | ||
*Where the original colours are '''brown-black-grey''' and it is now carrying single phase then '''brown=live, black=neutral, grey=earth''' | *Where the original colours are '''brown-black-grey''' and it is now carrying single phase then '''brown=live, black=neutral, grey=earth''' | ||
Tape will usually be used at each end of the cable to correctly identify the use. These colourways are not necessarily a 'standard' but are easiest to work out as live and neutral always follow one old code and one new code, with the most obvious red/brown being live, and blue/black as neutral. | *Tape will usually be used at each end of the cable to correctly identify the use. These colourways are not necessarily a 'standard' but are easiest to work out as live and neutral always follow one old code and one new code, with the most obvious red/brown being live, and blue/black as neutral. | ||
===Basement=== | ===Basement=== | ||
[[File:Basement elec.png|right|300px]] | [[File:Basement elec.png|right|300px]] | ||
Existing lighting remains in situ, along with some wall sockets (mostly at main stairs end). New circuits | Existing lighting remains in situ, along with some wall sockets (mostly at main stairs end). New circuits are provisioned via new distribution boxes as follows: | ||
*'''Box A''': All power, except overhead lighting circuits, which is used in the wood workshop. | *'''Box A''': All power, except overhead lighting circuits, which is used in the wood workshop. | ||
*'''Box B''': All power, except overhead lighting circuits, which is used in the 'dirty metal' workshop. | *'''Box B''': All power, except overhead lighting circuits, which is used in the 'dirty metal' workshop. | ||
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=== Metering === | === Metering === | ||
The power meter is one of these: | The power meter is one of these: [http://www.edmi-meters.com/products-meteringdevices-mk10d.html EDMI Mk10D] | ||
[http://www.edmi-meters.com/products-meteringdevices-mk10d.html EDMI Mk10D] | |||
* [http://www.cyamon.com/ How DLMS works] | * [http://www.cyamon.com/ How DLMS works] | ||
* [http://www.gurux.fi/index.php?q=DLMSCOSEMFAQ DLMS FAQ] | * [http://www.gurux.fi/index.php?q=DLMSCOSEMFAQ DLMS FAQ] | ||
