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Author Topic: LED's for lighting  (Read 17169 times)

OMK

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Re: LED's for lighting
« Reply #50 on: October 15, 2006, 11:45:57 PM »

"I always work on the premise that the only stupid questions are those that are not asked.".

Good point.
But once you've learned the answer, would the same question then become stupid again?

Sweeper:
With regards to your statement #2, you said: "RCD's do not detect current in the earth path, they operate by sensing the diffference in current between the phase and neutral conductors supply a load".
The UK 240vac system uses a method of earthing called PME. The majority of households today have their Neutral conductor bonded to the Earth. So what residual current is the RCD sensing in order to cause a trip?
What is the difference between a RCD and a ELCB?
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tigertiger

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Re: LED's for lighting
« Reply #51 on: October 16, 2006, 11:53:51 AM »

"I always work on the premise that the only stupid questions are those that are not asked.".

Good point.
But once you've learned the answer, would the same question then become stupid again?


Owch :'(

If the some questions recieve more than one answer... ??? or the answer is not clear to the unknowing ::) or if the answers conflict ???
I kinda hope for a little forebearance :)
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cbr900

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Re: LED's for lighting
« Reply #52 on: October 16, 2006, 12:03:46 PM »

Tiger,

Don't worry mate it's not always clear what is meant, and if you don't understand ask again, and I am sure it will explained a bit better, some of the remarks you see on here should be read and either forgotten or laughed at.



Roy
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tigertiger

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Re: LED's for lighting
« Reply #53 on: October 16, 2006, 12:39:02 PM »

In fairness

PMK reply #38 was was very good and I am grateful for your time and effort :). You obviously spent a lot of time on the circuit diagram.

But to a total novice like me ::), there were still questions.
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Doc

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Re: LED's for lighting
« Reply #54 on: October 16, 2006, 03:03:46 PM »

All kinds of reasons why the same question can be asked more than once.  It's normal for people afflicted with 'C.R.S.' syndrome, like me.  Or, you may be checking to see who answered your question has 'C.R.S.'?
 - 'Doc


[Only a few of us are born knowing all this stuff.  We expect this type of behavior from the rest of you, don't worry about it.]
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tigertiger

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Re: LED's for lighting
« Reply #55 on: October 16, 2006, 03:12:07 PM »

...It's normal for people afflicted with 'C.R.S.' syndrome...
[Only a few of us are born knowing all this stuff.  We expect this type of behavior from the rest of you, don't worry about it.]


Compulsive reply syndrome??? ???
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sweeper

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Re: LED's for lighting
« Reply #56 on: October 16, 2006, 04:58:13 PM »

Malc,
Thank goodness I'm not the only one to have an "age thing". I feel as though I might have been around since the steaming lights were installed in Victory, one of my students suggested that I forgot about the Victory but then asked what were the conditions like on the Ark :'(

PMK,
1.       True it is common practice to bond the neutral and earth together. This does not automatically make it PME. I wouldn't care to take a stab at the percentage that use genuine PME but I think that you'll find a higher proportion use a system known as CNE (combined neutral and earth). Similar principle but without the whistles and bells of a full PME setup. For info, PME was introduced primarily for use in areas where the ground conditions made it difficult to obtain a satisfactory earth electrode value. By using Multiple Earths (in parallel) this problem could be overcome. We found it not all sweetness and light back in the sixties!
 
2.  Use of a R.C.D., the bond between neutral and earth is carried out at the supply authorities intake position. The installation is bog standard apart from this. The RCD will detect any out of balance between phase and neutral currents as a result of an earth fault being present on the circuit or installation. The conductors in the RCD pass through a laminated core which in healthy conditions is magnetically neutral (both currents being the same) but in the event of an earth fault occuring a resultant magnetic flux will circulate in the core and cause a current to flow through a separate trip coil.

3. Difference between RCD and ELCB,  There used to be two types of ELCB, one current operated and one voltage operated. The current operated version is now what is classed as a RCD. The voltage type went out of use some time ago, they were very prone to failure if there was a parallel earth path on the installation as it would cause the tripping coil to be bypassed thus leaving the circuit / installation live with an earth fault on it with all the metalwork connected to the setup live.

I hope this answers your question.
Regards
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OMK

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Re: LED's for lighting
« Reply #57 on: October 27, 2006, 11:40:33 PM »

We found it not all sweetness and light back in the sixties!

Ah, you said "we". So would I right be in thinking you're an electrician, or maybe from an electrical engineering background?
And yes - you answered my questions bang-on. Thanks!

PME seems to be the order of the day around these parts. And most sparkies here - especially the young'uns - have not even heard of CNE.
In a way I'm wishing I'm never asked... I stlll have daymares whenever I'm reminded of them grotty old voltage-operated breakers (shiver!)
Anyway, thanks once again for the informative reply.
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OMK

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Re: LED's for lighting
« Reply #58 on: October 27, 2006, 11:50:36 PM »

...I kinda hope for a little forebearance :)

Hey, Tiger T, no offence meant. 'Twas written rather tongue-in-cheek. I thought you might have seen through my witty retort - it was supposed to induce a wee chuckle.
Serves me right for being a smartass.

Any questions you might have... fire away. Can't say I'll know the answer(s), but I know a man that does.

Apologies if I got up your hooter.
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tigertiger

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Re: LED's for lighting
« Reply #59 on: October 28, 2006, 02:56:01 AM »

PMK

Thanks :)
No problem ;D
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DickyD

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Re: LED's for lighting
« Reply #60 on: October 28, 2006, 09:17:43 AM »


Great, I read both pages of this posting, and I didn't dissapoint myself. I didn't understand a word !! ??? ???

In fact there weren't many words, most of it was initials !! ::) ::)

Richard
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cbr900

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Re: LED's for lighting
« Reply #61 on: October 28, 2006, 11:19:03 AM »

Whats up Richard a bit tetnicol for you mate.... :o :o :o



Roy
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OMK

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Re: LED's for lighting
« Reply #62 on: October 29, 2006, 01:20:56 AM »

Great, I read both pages of this posting, and I didn't dissapoint myself. I didn't understand a word !! ??? ???

Not something to gloat about then, eh?


Hey, Roy - nice work on the Triumph's. Beautiful, in fact.
Can't say that submarines are my thing. But your Seawolf - it caught my eye.

Scratch-built, or kit?
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cbr900

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Re: LED's for lighting
« Reply #63 on: October 29, 2006, 05:00:01 AM »

It's a kit mate, Robbe type works ok, but will be better when converted shortly to become a static diver, instead of dynamic....


Roy
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DickyD

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Re: LED's for lighting
« Reply #64 on: October 29, 2006, 09:59:41 AM »

Whats up Richard a bit tetnicol for you mate.... :o :o :o



Roy

Whats tetnical mate or is it supposed to be technical ::) ::)

When I've finished with English evening classes shall I send you the course papers?

I shall then do a course on tetncol bits and then all we'll have to get over is your accent :-* :-*

Richard ;)
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OMK

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Re: LED's for lighting
« Reply #65 on: October 29, 2006, 02:54:09 PM »

Maybe you ought to stay with them course papers.
Take a butcher's at your previous post. Or is that how they're teaching us how to spell 'dissapoint' these days?
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cbr900

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Re: LED's for lighting
« Reply #66 on: October 29, 2006, 03:12:03 PM »

PMK,

Very good mate, he who laughs last laughs loudest,,,,remember that Richard......... :o :o



Roy
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dougal99

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Re: LED's for lighting
« Reply #67 on: October 29, 2006, 03:29:22 PM »

But maybe they were coarse papers (about 200 grit I should think)  ;D
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DickyD

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Re: LED's for lighting
« Reply #68 on: October 29, 2006, 03:30:58 PM »

HA HA    Roy   ::) ::)

Told you I haven't finished the course yet!! ::) ::)
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Scottie

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Re: LED's for lighting
« Reply #69 on: November 17, 2006, 10:20:26 PM »

Don't know if this is of help but here goes anyway.

I used leds on my Egrete pusher tug. Deck lights, mast lights and nav lights are all 3v superbright white leds.

Have a look at it here. - www.marine-modelling.co.uk - click on Egrete from the nav menu.

Need any more info e-mail me from the site.

Scottie
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portside II

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Re: LED's for lighting
« Reply #70 on: December 27, 2006, 03:14:23 PM »

hi Mike
God bet you didn't think you would get such a varied responce  the replies got my attention .
so while you digest all the info if you pop into your local maplin they can (as they did me) provide you with a box of mixed LED's (yellow,red,green) in two sizes small and smaller for about a fiver and they will also supply you with the resistors to suit 3v,6v,9v,12v and 24v which should cover most needs.
I have them fitted to mine and the white ones are great in spotlights .I am also experimenting with white LED's in the end of clear acrylic rods as flurecent lights for walkways and wheelhouses, you gotta keep trying
daz 
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Stan

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Re: LED's for lighting
« Reply #71 on: December 27, 2006, 05:15:25 PM »

 :)Hi  Mike

Most L/E/D will on 2 volts  i/e red green  etc if wish to use white L/E/D then you need at least 3 volts for them to  work putting in resistors is not  hard i have just wired up a model for one of our club members. Please contact  all components   on 01981 540781  for futher information hope this helps. :)
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