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Electromagnetic Door Control wiring
This is 24V and need to cable up between closer and switched supply.
I have checked the supply does go off with a fire alarm! What cable should I use? I'd rather use something other than mains cable to differentiate between mains and ELV. |
Electromagnetic Door Control wiring
On Sat, 14 May 2016 22:21:19 +0100, Fredxxx wrote:
This is 24V and need to cable up between closer and switched supply. I have checked the supply does go off with a fire alarm! What cable should I use? I'd rather use something other than mains cable to differentiate between mains and ELV. I used telephone cable. I ran six pairs from the wiring centre to the front door, and just used one of those. The current draw isn't great (on mine, anyway) and the duty cycle is low. -- My posts are my copyright and if @diy_forums or Home Owners' Hub wish to copy them they can pay me £1 a message. Use the BIG mirror service in the UK: http://www.mirrorservice.org *lightning surge protection* - a w_tom conductor |
Electromagnetic Door Control wiring
On 15/05/2016 00:04, Bob Eager wrote:
On Sat, 14 May 2016 22:21:19 +0100, Fredxxx wrote: This is 24V and need to cable up between closer and switched supply. I have checked the supply does go off with a fire alarm! What cable should I use? I'd rather use something other than mains cable to differentiate between mains and ELV. I used telephone cable. I ran six pairs from the wiring centre to the front door, and just used one of those. The current draw isn't great (on mine, anyway) and the duty cycle is low. Many thanks for the idea. Its only a short distance. I would have preferred to have exported an earth as well, given the cases are metal, and the transformer of unknown origin. I was looking for shielded cable or screened twisted pair, then it dawned on me I can make one conductor earth as well as 0V return! |
Electromagnetic Door Control wiring
What current does the solenoid use though?
Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! "Fredxxx" wrote in message ... This is 24V and need to cable up between closer and switched supply. I have checked the supply does go off with a fire alarm! What cable should I use? I'd rather use something other than mains cable to differentiate between mains and ELV. |
Electromagnetic Door Control wiring
On Sunday, 15 May 2016 01:06:28 UTC+1, Fredxxx wrote:
Its only a short distance. I would have preferred to have exported an earth as well, given the cases are metal, and the transformer of unknown origin. I was looking for shielded cable or screened twisted pair, then it dawned on me I can make one conductor earth as well as 0V return! Fire alarm cables are usually red, I don't know if the door closer wiring has to be too, but I don't think it would do any harm. https://www.tlc-direct.co.uk/Products/NB1slash2R.html Screened, available in 2+E and 4+E. Sold per metre. Owain |
Electromagnetic Door Control wiring
On 14 May 2016 23:04:09 GMT, Bob Eager wrote:
I used telephone cable. I ran six pairs from the wiring centre to the front door, and just used one of those. The current draw isn't great (on mine, anyway) and the duty cycle is low. I think he is referring to an electromagnetic door holder rather than a catch so the duty cycle is more or less 100%. The power consumption is still low though - typically only 1 or 2 Watts so almost any cable would be suitable. |
Electromagnetic Door Control wiring
On 15/05/2016 09:11, Brian Gaff wrote:
What current does the solenoid use though? Brian That's a good question. I could measure the resistance of one. I assume it can only take a couple of watts. |
Electromagnetic Door Control wiring
On 15/05/2016 11:14, Peter Parry wrote:
On 14 May 2016 23:04:09 GMT, Bob Eager wrote: I used telephone cable. I ran six pairs from the wiring centre to the front door, and just used one of those. The current draw isn't great (on mine, anyway) and the duty cycle is low. I think he is referring to an electromagnetic door holder rather than a catch so the duty cycle is more or less 100%. The power consumption is still low though - typically only 1 or 2 Watts so almost any cable would be suitable. Yes, it will be permanently on, even when the door is closed, and only off where there's a fire alarm. Either way we are talking sub-Amp. |
Electromagnetic Door Control wiring
On Sun, 15 May 2016 11:44:56 +0100, Fredxxx wrote:
On 15/05/2016 09:11, Brian Gaff wrote: What current does the solenoid use though? Brian That's a good question. I could measure the resistance of one. I assume it can only take a couple of watts. FWIW, a while back I helped my BIL (a builder) release and re-connect the cabling to a door entry system from a wall he was removing for a company. The 'fail - safe' door bolt along with the alarm keypad were run (some distance) to the reception though a multi core cable, the conductors not much bigger in wire gauge than Cat5 / telephone. YMMV etc. ;-) Cheers, T i m |
Electromagnetic Door Control wiring
On Sun, 15 May 2016 09:11:50 +0100, "Brian Gaff"
wrote: What current does the solenoid use though? 24V at 1 to 2W so 40 to 80mA. |
Electromagnetic Door Control wiring
Peter Parry wrote in
: On Sun, 15 May 2016 09:11:50 +0100, "Brian Gaff" wrote: What current does the solenoid use though? 24V at 1 to 2W so 40 to 80mA. Intrigued - how come so little? |
Electromagnetic Door Control wiring
On 15/05/2016 19:09, DerbyBorn wrote:
Peter Parry wrote in : On Sun, 15 May 2016 09:11:50 +0100, "Brian Gaff" wrote: What current does the solenoid use though? 24V at 1 to 2W so 40 to 80mA. Intrigued - how come so little? Guess lots of turns! A solenoid is not like a transformer, where I is purely limited by the solenoid coil resistance. |
Electromagnetic Door Control wiring
On Sunday, 15 May 2016 19:09:56 UTC+1, DerbyBorn wrote:
Intrigued - how come so little? The solenoid doesn't hold the door open directly - it just holds a latch inside the closer which stops the closer operating. The solenoids which attach to the wall and are no part of the door closer mechanism probably use more. Owain |
Electromagnetic Door Control wiring
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Electromagnetic Door Control wiring
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Electromagnetic Door Control wiring
Fredxxx wrote
This is 24V and need to cable up between closer and switched supply. I have checked the supply does go off with a fire alarm! What cable should I use? Whatever will handle the current without dropping too much voltage. I'd normally use what we call Figure 8, because it is readily available and has plenty of copper so that it wont drop too much voltage at any current that is likely in that situation and quite cheap because its sold in very high volume. http://static.rapidonline.com/catalo...17214P01WL.jpg I'd rather use something other than mains cable to differentiate between mains and ELV. Makes more sense to use a different color. |
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