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Power/works list: Difference between revisions

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Power/works list (view source)

Revision as of 23:40, 2 May 2013

1,786 bytes removed ,  2 May 2013
update
(cable colour codes)
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===Enabling works===
===Enabling works===
* Fit cable tray in basement
* <s>Fit cable tray in basement</s>
** Check with [[User:Solexious|Solexious]] how much extra weight will be needed for his warning light cable - extend tray towards stairs if required
* <s>Cut slot and holes in galvanized steel trunking length, as marked</s>, tape edges of large slot
* <s>Cut slot and holes in galvanized steel trunking length, as marked</s>, tape edges of large slot
** <s>attach swa termination fittings to each of the holes on the top, ready to receive cables later</s>
** <s>attach swa termination fittings to each of the holes on the top, ready to receive cables later</s>
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===Armoured cable works===
===Armoured cable works===
* The cable coming through to upstairs by the office became shortened while being cleated to the wall and needs to be replaced.
* <s>The cable coming through to upstairs by the office became shortened while being cleated to the wall and needs to be replaced.</s>
** <s>The cleats are not tight on the cable so it can be just eased through - it will be re-used downstairs</s>
** <s>The cleats are not tight on the cable so it can be just eased through - it will be re-used downstairs</s>
** <s>position the reel of 16/3 swa upstairs where the 'CU' is marked on the wall. Pull through cable via the cleats to downstairs and out to the new distro box</s>
** <s>position the reel of 16/3 swa upstairs where the 'CU' is marked on the wall. Pull through cable via the cleats to downstairs and out to the new distro box</s>
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*** cable fixes via trunking, cut for length though to equal *bottom* of new distro box
*** cable fixes via trunking, cut for length though to equal *bottom* of new distro box
* <s>Re-use 16/3 swa cable from upstairs to reach from new distro box (bottom of) to whichever workshop it will reach to</s>
* <s>Re-use 16/3 swa cable from upstairs to reach from new distro box (bottom of) to whichever workshop it will reach to</s>
** Install new 16/3 swa cable to other sub-box locations in basement (1 fewer then general workshop, wood, metal, bio-wet)
** Install new 16/3 swa cable to other sub-box locations in basement (1 fewer then general workshop, wood, metal, <s>bio-wet</s>)
;Note - whilst swa will be terminated on top of the trunking, the cables will need to reach the equivalent of the ''bottom'' of each box
;Note - whilst swa will be terminated on top of the trunking, the cables will need to reach the equivalent of the ''bottom'' of each box


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*** Fit female conduit ends to back boxes before installation, cut 8x 24cm lengths of conduit and build socket line on floor. Hold to wall to mark screw positions. Drill and fit.
*** Fit female conduit ends to back boxes before installation, cut 8x 24cm lengths of conduit and build socket line on floor. Hold to wall to mark screw positions. Drill and fit.
*** Ring should be wired on alternate boxes for preference. Ensure earth sleeving is used, especially on short earth leads to boxes.
*** Ring should be wired on alternate boxes for preference. Ensure earth sleeving is used, especially on short earth leads to boxes.
===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.
===Phase allocation===
* We have a three-phase supply and need to keep our consumption on each phase roughly equal.
* This means that different areas, even if adjacent, may be on different phases. '''Do NOT use extension leads from one area to feed equipment in another'''.
;Remember - NEVER CROSS THE PHASES!
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