new shop in leeds

[wayne]

rich,
i am not an expert
411.3.1.1 just says "a protective conductor"it doesn't specify any circuit
have a read post your thoughts

 

[sparkyork]

still reading the big red book, in chapter 54; 542.4.1 item (iii) functional earthing conductors (if required)....im now looking at 543.1.4 table 54.7, i know this table is where you decide a 25mm incoming tails supply has a 16mm main earthing cable, however, if it turns out that a cpc is required to be fitted to the tray then could it be that ill need to add up the sizes of line conductors on my tray and work out the size of the cpc from there and run this back to the MET...

im getting confused to say the least! lol! might just get rid of the tray and buy some 6 x 1 timber!

 

[wayne]

trays fine ,
sparks usually bond it to either another exposed conductive part or a cpc eventually bonding back to the earthbar usually 4mm but dont ask me where in the regs this is!!

 

[tony.towa]

Hi Rich

Just been catching up on your shop, from what I see it should be used by customs and excise cos it looks like it's going to be a "Bonded Store". Sorry about that but I feel better now.

Looking back you had some question about the wiring for the lighting in the store. If you want to let me know the details of the floor area number of fittings (including size and style) and what ideas there are for the layout I will have a look for you.

Cheers
Tony

 

[wayne]

hi tony,
shakey likes to agree with me by disagreeing

 

[sparkyork]

ha he lol!

cheers tony, the front area of the shop measures about 12m x 7.3m and is 5.5m high, the custromer has been in contact with jcc i beleive and im also led to beleive he's going for a 150w pendant style fitting(thnk metal halide variety). he's told me hes getting 6 of these for this front area and ive have installed 3 conduit runs from the tray up and over the cieling to these rough positions (current spacing is like a "6" on a dominoe piece! ive spaced these as equally as i deemed wise to and there is a bit of movement if need be. (not too much tho!) the height is gonna be one consideration i guess.

the back end of the shop is gonna be a mezzanine floor area with grid style floo's (4 tube variety), the numbes of these arnt confirmed yet as its not even built yet etc and ive also told him to get some of these with e'lighting as well.

any suggestions always welcome!!

rich

 

[tony.towa]

From what you have posted previously I reckon you already have an idea but my thoughts are.

Divide the standard fittings and run them off two seperate breakers. Run the e/lights off a third breaker. I would have the actual switching controlled through a contactor (240volt coil the A1 fed from the same supply as the e/lights). By doing this a ballast blowing will only take out a max of 50% lighting in the shop and the actual load at the wall switches will be kept to a minimum. It is also easier to add extra lighting at a later date. You can also split the load between phases without having a 415 potential at the switches. With the contactor control voltage off the same feed as the e/lights a contactor failure should bring on the e/lights.

If your domino design is set up one third width of room distance between wall and first row you may find that you will have to move the fittings slightly towards the walls to get an even light spread. This depends a lot on the actual reflector type fitted to what I am assuming are the commercial style Hibay fittings.

Sorry if I have been trying to teach granny to suck eggs but hope it helps or gives you a laugh.

Cheers

Tony.

 

[sparkyork]

thats great chees tony, i was thinking about the need for a contactor or not as well, not sure how much current these lights pull but like you say if its on a contactor then its easy to sort, spesh not having 400v at the switches as well!
so you reckong i just want two rows of three fed by individual mcbs. all via a contactor system.

 

[tony.towa]

Hi Rich

That sounds fine but you can play round with all sorts of options by using a contactor. If you put the feed to the mez lights through the third pole and used a secure or key switch for the contactor control this could be situated by the staff entry/exit point allowing a last man total switch off of the lighting. You can then run this feed through your local switching points for the mez lighting, Obviously if this area is to be in use when the shop is not lit it will not be suitable.

Lots to think about and possibly impress your client with.

 

[sparkyork]

lots of ideas, i like it!

too much too think about tho, its starting to do my head in, spesh when im trying to get to sleep! not gonna be there till monday now as ive got some metal in my eye from drilling the conduiit on the cieling, been in and got the metal removed but its left a rust ring in my iris now!

rich

 

[wayne]

first concrete now metal WEAR GOGGLES enjoy your day off

 

[tony.towa]

Take it steady Rich and have a good weekend. Reckon Wayne's right about the goggles but there again I keep leaving mine in the van and remember them when something catches me.

 

[sparkyork]

yeah should be great fun getting me eye ball scraped! thanks guys and yeah im gonna wear em all the time now! think it must of been the reinforcing metal of the cienling i was drilling into!

rich

 

[wayne]

worse time i had with something in the eye was a simple peice of dust while waiting for a bus (a while ago)by the time i got off the bus i couldnt keep either eye open had to cross the street blind and hop on another bus for the hospital .

 

[sparkyork]

right then, ive abandonned the main shop area now till they build the mezzanine etc.
im now upstairs in the yoga room and office and wc rooms!

im having to do it surface in the yoga room, ive got power cables and lv cables to run through this area to rellavent accesories. im using 50x50 trunking and dropping out in pvc conduit etc, i know you have to keep these cables a good 50mm apart (power & lv) but is there any need to keep individual trunking this far apart?

would look so much better if i could run all trunking along side each other! does the plastic act as any kind of interference get ridderofer! lol

Eyes ok now, had to have my cornea grinded abit to get rid of the rust ring.

rich