removed
(!)It follows that the device should only be used when someone capable of giving CPR (Cardio-pulminary-resuscitation) is present, and should not be used on anyone who declines it's promised treasures.
You think that chandelier is bad?
Check this out... by the same guy
(!)It follows that the device should only be used when someone capable of giving CPR (Cardio-pulminary-resuscitation) is present, and should not be used on anyone who declines it's promised treasures.
Until you tried to draw any current...You'd also see 230v across the lampholder with the blown lamp, or across the lampholder should one lamp be removed from a healthy circuit.
Until you tried to draw any current...You'd also see 230v across the lampholder with the blown lamp, or across the lampholder should one lamp be removed from a healthy circuit.
Yes it is common for lamps at moment of failure to have ionisation and often there is a built in fuseable link which should blow first to stop main fuse blowing. I am sure you have seen lamps blow with a bright flash and leave glass blackened inside.If it goes open circuit there will be 0v across each lampholder.Although it would work "theoretically", in theory, there would be the potential for 230v across a 12v lampholder if there was a break anywhere in the series circuit.
Do they ever do that?if a lamp or number of lamps were to fail short circuit
Now envisage the same scenario with a regular LV lampholder, and show why that one is of no concern.I expect it would still be enough to give a nasty shock. Negating any effects of heating on the filament, a 12v 20w lamp will have a resistance of about 12v / (20w/12v) = 7.2 Ohms. Best case scenario is that you get a shock from the lasmp furthest from the live terminal, in which case you have 19 lamps x 7.2 Ohms = 137 Ohms between yourself and 230v AC.
If you were then to take a resistance across your body of 1000 Ohms (admittedly this may be a little on the low side, but for arguments sake) then you have the potential for 230v / (1000+137Ohms) = 202mA of current there, assuming you're looking purely at resistance rather than worrying about impedance. That would also mean a voltage across your body of 1000 Ohms * 0.202A = 202v.
Although very little current in electrical terms, it's still enough to kill.
Now envisage the same scenario with a regular LV lampholder, and show why that one is of no concern.I expect it would still be enough to give a nasty shock. Negating any effects of heating on the filament, a 12v 20w lamp will have a resistance of about 12v / (20w/12v) = 7.2 Ohms. Best case scenario is that you get a shock from the lasmp furthest from the live terminal, in which case you have 19 lamps x 7.2 Ohms = 137 Ohms between yourself and 230v AC.
If you were then to take a resistance across your body of 1000 Ohms (admittedly this may be a little on the low side, but for arguments sake) then you have the potential for 230v / (1000+137Ohms) = 202mA of current there, assuming you're looking purely at resistance rather than worrying about impedance. That would also mean a voltage across your body of 1000 Ohms * 0.202A = 202v.
Although very little current in electrical terms, it's still enough to kill.
It depends how much current you mean, if the circuit is open circuit then the full voltage will be measurable with a dvm.Until you tried to draw any current...You'd also see 230v across the lampholder with the blown lamp, or across the lampholder should one lamp be removed from a healthy circuit.
ericmark said:The start up current on a quartz halogen lamp is many times its run current and it is unlikely they would all take same current on start up
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local