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Project/ElectricalWorks/MainRoomRefit: Difference between revisions
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== Current State ==
The existing sockets are connected to a 32A ring main, wired back to the Main Board. This includes the metal-clad sockets on the wall itself as well as the floorbox.
The extractor fan is connected via a switch-fused connection unit, which then feeds a separate speed controller and out to the fan itself.
Verified that this is fused at 5A, and the fan is fed by a 5 core 0.75mm flex from the controller.
A 20A circuit from
== Planned Work ==
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* Pull through 8 x data cables for new network sockets in dado trunking.
* Install new dado trunking, and fit sockets and data points.
* Install fused spur boxes ready for 3D printer stand and member's display PC.
* Install fused spur for the projector.
== Photos and Drawings ==
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File:Detail_db2a.jpg|Board DB2A
File:Detail_kitchen.jpg|Kitchen Board
File:Detail_West_Wall.jpg|The main room west wall
File:Detail_heatpump.jpg|The Heat pump and extractor fan
File:Fan_control_front.jpg|Fan controller
File:Fan_control_rear1.jpg|Fan controller wiring
File:Fan_control_rear2.jpg|Fan controller wiring
</Gallery>
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* 3 x 4-way extension leads prepared for temporary power to the PC's during the works.
* Single trailing socket prepared for the ceiling-mounted projector.
* Heat pump - first quote advises we will need an external isolator for a 6kW load.
** This translates to a 32A radial circuit with a 4-pole IP67 isolator.
** Cable run will be ~15m inside the building, plus ???m of SWA through the wall and outside to the isolator.
** Inside run will require either 6mm 70C cable or 4mm 90C cable for current rating.
** Isolator needs to be fitted at a suitable height to deter 'casual tampering'
** Works Needed :
*** Sort out balancing on L3 phase (see below)
*** Install 6mm 6491X conduit cable in box trunking to spare exit point adjacent West Wall
*** Use flexible conduit to bridge to a new metal junction box on West Wall.
*** Fit 4mm 3-core SWA from junction box, through wall and into IP67 rated isolator
* Traced feed for DB2A onto the L3 phase.
** This is the same phase as the downstairs workshop sockets and bandsaw
** Need to re-balance this before fitting a new 32A circuit for the heat pumps
** Sequence :
*** Remove upstairs ring main from Main Board 6L2
*** Move DB1A from Main Board 6L3 to 6L2
*** Fit 32A MCB to Main Board 3L1 for new circuit
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