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447 Power: Difference between revisions
From London Hackspace Wiki
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;Remember - NEVER CROSS THE STREAMS! ... er ... PHASES! | ;Remember - NEVER CROSS THE STREAMS! ... er ... PHASES! | ||
===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. 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 '''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. | |||
===Basement=== | ===Basement=== | ||
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*'''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. | ||
*'''Box C''': All power, except overhead lighting circuits, which is used in the biolab and wet room | *'''Box C''': All power, except overhead lighting circuits, which is used in the biolab and wet room '''Grey/Yellow/Phase 3''' | ||
*'''Box D''': Power circuits, except overhead lighting, for equipment in open workshop area. | *'''Box D''': Power circuits, except overhead lighting, for equipment in open workshop area. | ||
*'''Box E''': possible 3-phase 16A power circuit. Not in current use, | *'''Box E''': possible 3-phase 16A power circuit. Not in current use, | ||
*'''Box F''': Power for server stack, future CNC workshop, and additional circuits. | *'''Box F''': Power for server stack, future CNC workshop, and additional circuits. '''Grey/Yellow/Phase 3''' | ||
===Ground Floor=== | ===Ground Floor=== | ||
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This will be similar to downstairs in terms of getting the power to needed areas, though there are more socket points already in situ; New local distribution boxes are as follows: | This will be similar to downstairs in terms of getting the power to needed areas, though there are more socket points already in situ; New local distribution boxes are as follows: | ||
*'''Box J''': Supplies sockets in electronics desks, entrance, social space and (part of) central area. Also supplies emergency exit lighting above stairs and at main entrance.'''Brown/Red/Phase 1''' | *'''Box J''': Supplies sockets in electronics desks, entrance, social space and (part of) central area. Also supplies emergency exit lighting above stairs and at main entrance.'''Brown/Red/Phase 1''' | ||
*'''Box K''': Supplies sockets and equipment in local area and circuit to sub-box ''' | *'''Box K''': Supplies sockets and equipment in local area and circuit to sub-box '''M''' supplying outside. '''Black/Blue/Phase 2''' | ||
*'''Box L''': Supplies the two socket rings in the new classroom, plus corridor. Also supplies the emergency exit lighting at each end of corridor. '''Grey/Yellow/Phase 3''' | *'''Box L''': Supplies the two socket rings in the new classroom, plus corridor. Also supplies the emergency exit lighting at each end of corridor. '''Grey/Yellow/Phase 3''' | ||
*Existing: mostly '''Brown/Red/Phase 1''' | *Existing: mostly '''Brown/Red/Phase 1''' | ||
===Queries=== | ===Queries=== | ||
