Ten 6ft fluorescents in a line

[GBDamo]

After the YY burnout posted in;-

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I intend to rewire and have given a rough quote.

Background.

These lights are head height wall mounted intended to illuminate the engine bay of a car, 10 workstations in a large workshop.

At present they are through wired through each other so, if the cable goes in one they all go upstream.

The reasoning behind my intention is that should one fitting go then the a fuse will blow highlighting the damaged fitting and allow continuity of works with the other lights.

Also allows for the damaged light to be worked on without isolating the circuit (FCU option).

Intention

Is to re-wire in galv conduit in 2.5 singles running the whole circuit off a c25 MCB.

And

1, give each fitting it's own FCU fused to 3A

or (see Questions)

2, Fit a 5x20mm fuse holder to an IP65 JB and use a quick blow fuse.

Then flex down to each fitting from the FCU/JB.

The customer is keen on this approach if it is reasonably feasable.

Questions

1, I can't find a source I trust for a 3A BS1362 curve, BBB don't have it so can't be sure the BS1362 will go before the MCB, any pointers?

If the above is a non starter;-

2, Does anyone see an issue with the approach of fitting fuse holder to a JB and 5A F rated fuse, this route also allows me to down rate the circuit CSA and MCB and ?

 

[Toneyz]

Is there not fuses within the fittings? The problem with fluorescent fittings is that they can run hot if they are on the length of time they are on and probably breaking down with the effect of heat also.
Not seeing the existing installation I would do a run of conduit with a T box with flexible conduit (or the like) into the end of the fitting. A joint in the T box so that an H/R flex into the fitting. Having done some work within this type of installation you find everything covered with a layer of greasy dirt, therefore, I wouldn't use plugin ceiling roses.

 

[ipf]

SWA into galv thru boxes wired into click roses?
What type of fluorescent fittings are currently installed?
Do you still have the ‘fried’ cable?
Please send it to Basec, they will inspectigate why and how it is fried..

I think it may be the ballasts …. tucked up the side of 'em….pretty Basec that, Charlie.

 

[Deleted member 26818]

If you’re going to go the galv conduit route, I would suggest two 10A circuits leap frogging each other.

 

[Shoei]

They still need a circuit running in as the YY is fried, due to the environment it needs to be in galv.

Adding ten LED non corrosives to the bill would be a no go.

Ten LED non-corrosives would be about £400. If they're all on for full working days it wouldn't take long for the power saving to pay for the lot. Wouldn't have thought the difference between LED and fluorescents would add too much to the quote.

 

[Andrew Hunter]

Why expensive? Just replace the fittings and feed from plug in roses so that you can isolate any faulty ones.

They still need a circuit running in as the YY is fried, due to the environment it needs to be in galv.

Adding tend LED non corrosives to the bill would be a no go.

I agree with IPF Change fittings for suitable ones prferably LED that are intenally fused at 1 Amp and wire using Greg roses for disconnection/Isolation.
Whole installation if installed at suitable arms reach height or above if safe from mechanical damage risk of vehicles hitting or any other mechanical damage it could be run in HD plastic conduit above the line of fittings.
This way the complete circuit is drawing no more than 1.6 amps and can be wired in 1.5 mm singles with 1.0 mm flex to each fitting and be fed by a 6 amp type B mcb affording you discrimination local point of isolation for safety and saving the customer money in the long run whilst keeping the installation cost reletivly low. Not to mention the added bonus of saving the planet. there is also room in ther to suggest the customer and hes employees would benifit from changing some of these fittings for emergancy fittings.

 

[davesparks]

there is also room in ther to suggest the customer and hes employees would benifit from changing some of these fittings for emergancy fittings.

If the emergency lighting installation is correctly designed yes, if not then you could end up with a bunch of useless emergency fittings