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 ?

 

[telectrix]

why not convert existing fittings to LED tubes?

 

[GBDamo]

2.5mm does not mean you have to fit 25A, I am not getting that.

Looking at the fuse curve Snowhead linked to i think you're right, don't need to go anywhere near that high.

 

[GBDamo]

why not convert existing fittings to LED tubes?

I like LEDs, I do, it's just not the job here.

 

[ipf]

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.

What fittings are you planning for....and how long a conduit run?

 

[GBDamo]

I think you are over engineering this....

This, think I'll forget the fusing idea and put them all on clicks.

 

[GBDamo]

What fittings are you planning for....and how long a conduit run?

The fittings are already in place, they are twin 70W fluoros, conduit run is about 40M

 

[DefyG]

Why expensive?

Galv conduit to individual metal clad S/FCU's to each fitting !

Lamps could be changed to LED, and do away with the ballast (heat) !

 

[ipf]

Galv conduit to individual metal clad S/FCU's to each fitting !

Lamps could be changed to LED, and do away with the ballast (heat) !

6ft led replacement lamps are total carp...….unless they've improved 10 fold in the last couple of years.
You could look at swa or hi tuff, if appropriate, terminated in conduit boxes with plug in roses.
Still don't get this fcu business.

 

[GBDamo]

Galv conduit to individual metal clad S/FCU's to each fitting !

Lamps could be changed to LED, and do away with the ballast (heat) !

The wiring is fried.

The current installation needs replacing.

The correct method for the environment is galv.

Doing anything to the fittings at the moment is just cost with no immediate necessity.

If it WAS done as you suggest then we wouldn't be having this chat.

(other than the SY)

 

[davesparks]

I don't quite see the point here, any and every lighting circuit has the same potential for a fault at one fitting to take out the whole circuit, what's so special in this particular case?
If there is a danger from the loss of the lighting circuit then a correctly designed emergency lighting system is needed.

 

[GBDamo]

6ft led replacement lamps are total carp...….unless they've improved 10 fold in the last couple of years.
You could look at swa or hi tuff, if appropriate, terminated in conduit boxes with plug in roses.
Still don't get this fcu business.

I don't quite see the point here, any and every lighting circuit has the same potential for a fault at one fitting to take out the whole circuit, what's so special in this particular case?
If there is a danger from the loss of the lighting circuit then a correctly designed emergency lighting system is needed.

Not danger, convenience.

 

[ipf]

The wiring is fried.

The current installation needs replacing.

The correct method for the environment is galv.

Doing anything to the fittings at the moment is just cost with no immediate necessity.

If it WAS done as you suggest then we wouldn't be having this chat.

(other than the SY)

If the wiring's fried, I can't see the fittings being in the best of nick.
You're saying galv in the envionment.....what is the environment?

 

[GBDamo]

If the wiring's fried, I can't see the fittings being in the best of nick.
You're saying galv in the envionment.....what is the environment?

Workshop, it's high level (2.5m) but there are hinged recoil air lines all along the wall so quite a high likelihood of mechanical damage. No other realistic route either.

 

[Charlie_]

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..

 

[shaun1]

If there is a wiring fault they are going to have to have it repaired anyway, and if it is done properly now, its unlikely to occur again in the next 20 years. So is the inconvenience of having to use work lamps/torches for a few hours, maybe once every few years, until they can get an electrician on site, worth the cost of adding in isolators for each lighting fixture?