Dealing with voltage drop

[skenk]

What's the L-N fault current (pscc) at the end of the long run? If volt drop is out of spec, that may be too, and that's a requirement of the regs not a recommendation/not applicable here like volt drop

 

[JohnW2]

That's the maximum theoretical draw (all on full white), in reality it's going to be far lower.

Are you sure of that? 8A at 230V is 1,840 W, and 1,840 W's worth of LEDs would be 'equivalent' to something in excess of 14,000 W's worth of traditional incandescent light bulbs (i.e about 140 x 100W bulbs)..

Exactly what, and how extensive, are these "Christmas decorations"?

Kind Regards, John

 

[ericmark]

This I see as a problem, one looks at the package and sees 60 watt, only when one looks more careful do you see really only 9 watt, and they all seem to be the same. Also this

one sees the dimmable sign, any yes can be dimmed but not with a standard dimming switch.

 

[bernardgreen]

This lot of lights is less than a Kw

 

[JohnW2]

This lot of lights is less than a Kw

Quite so - I'm not surprised. It does seem that the OP is probably greatly over-estimating the current drawn (hence VD) of what he has.

Kind Regards, John

 

[Deleted member 307320]

Are you sure of that? 8A at 230V is 1,840 W, and 1,840 W's worth of LEDs would be 'equivalent' to something in excess of 14,000 W's worth of traditional incandescent light bulbs (i.e about 140 x 100W bulbs)..

Exactly what, and how extensive, are these "Christmas decorations"?

Kind Regards, John

I'm just going by what the installers have said the absolute maximum draw can be and working with that. There's also some processing going on, so I'm guessing the electronics are taking a chunk of that power.

As I think I said, this is a large commercial display

 

[JohnW2]

I'm just going by what the installers have said the absolute maximum draw can be and working with that.

Fair enough.

There's also some processing going on, so I'm guessing the electronics are taking a chunk of that power.

I doubt that the electronics will consume significant power (in comparison with the display itself). I would imagine that my mobile phone has far more processing capability than would be needed to control the display!

As I think I said, this is a large commercial display

I confess that I was going just by you original post, and had not noticed your subsequent ...

.... Should probably add that this is a shopping centre Christmas display!

However, i still don't think that voltage drop is something to worry about. The 3%/5% figures are only recommendations for fixed installations and, as you've said, a voltage drop of even 50% ought to be OK if the display is being powered via SMPSUs. However, as has been said, the one thing to check is that the loop impedance is sufficiently low (since that is a requirement, not just a recommendation) - but that very probably will not be a problem.

Kind Regards, John