Key Operated Switches and Emergency Lighting
Вставка
- Опубліковано 27 лип 2016
- Overview of emergency light fittings and using a key operated switch to disconnect power for test purposes.
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Brilliant as always JW. Simple, concise and easy to follow whatever level of skill one has.
I have also seen key switches used for other "maintenance personnel only" switches, such as forcing on or off lighting that is otherwise automatic when testing or replacing bulbs, or as regular light switches in areas accessible to the general public. It helps that in my country, key switches fit the same boxes as regular switches, allowing trivial change between types.
emergency light fixtures are now pretty much the final place you can find nicad batteries, apparently because they can be constantly charged at very low currents, no sophisticated charging circuit, and the manufacturers are very resistant to upgrading the technology. even cheap power tools have moved on.
How can anyone gives this a Thumbs Down. Explanation and demonstration superb.Very sad people.
Great vid John. Glad you made that point at the end about switch emergency supplied only, just last night we tested a building that cuts all lighting on the key!
Maintained is less common than Non-Maintained or even combined here in the US. Combined is used where no additional fittings are desired, in that case a test button does protrude into either the lamp cavity or out of the base depending on the fitting. A US type fluorescent combined unit contains two separate ballasts (one standard and one emergency) with one or more lamps. Neutral and earth are combined from both ballasts. The line from the emergency ballast is equal to the Line terminal on UK combined, the standard ballast line is equal to the switched line.
The most complete emergency light set up guide, even for amateurs. Great document.
Great explanation! Always a pleasure to watch.
Brilliant Mr Ward, just a great individual
This was perfect mate, thanks for the help
What I tend to do John is operate the key switch at the beginning of my EIR testing or other maintenance and check the light output after 3 hours, and just replace any fittings that have weak batteries as it is normally cheaper and quicker than just replacing batteries alone.
If I fitted maintained lights (always off ) and client asked for them to be constantly on could I simply put in the the link from permanent live into L1 ?
The little one can reach the light switch from their cot. Rather than move the cot or the light switch, can I replace the standard switch for a key operated switch?
On the last part where you have an extra switch running to the SL. Could you still use the loop from the L to the SL to bypass the lightswitch instead of needing to remove that second switch?
whats interesting is iv'e worked in maintenance for years and i never really knew HOW these lights worked on the inside, usually when it goes bad you just pull the old battery/ballast out and replace the lights with wire for wire so its nice to have a bit of a breakdown for what i end up repairing. our company only uses one brand and type of lights so we are just told pull out and put in a new one so thers not really any question of what to wire and hook up.
Thank you, John! Complete giude, as always!
Do you know where I could order some wire in order to extend the mains wires to the terminal of a fitting? I.E for those situations where the mains wires don't reach the light and need to be extended using other wires?
In UK do you must installing emercency lights in houses? Or only owners in rented houses/apartments? Do you know if you have fire inside, the smoke is possible very thick, so the emercency lights should at down at the floors. If failed the power often it is better to repair the maistake power line ...
So if you had a key switch and a normal switch right next to each other, would you just link the live out from key switch to common terminal in normal switch?
John, should the permanent live feed to emergency luminaires be from a separate MCB in a CU? or can they be fed from the same one as the lights in the area the emergency luminaires cover?