When specifying magnets you need to consider various elements. Is the system designed to restrict access throughout a building? In this case a slim line magnet with a holding force of up to 600lbs will probably suffice. Is the door designed for medium security use? In this case a standard magnet with a holding force of up to 1,200lbs will probably suffice. Is the door in a high security situation? In this case a shear magnet with a holding force of up to 3,000lbs is necessary. A shear magnet is also the only type of magnet suitable for double action doors. You will also need to consider what will happen in an emergency or if there is a power failure.
Magnets are fail-unlocked devices, they require a constant power source to keep them locked. A magnet is unlocked by breaking the feed from the power supply. You can also break this feed with a fire alarm relay to unlock the door in the event of a fire. A regulated 12V DC or 24V DC power supply should always be used. Please ensure that the power supply specified has sufficient capacity (amps) for all the devices attached to it. You should consider fitting a backup battery to the power supply in case of mains failure. When interfacing with an audio or video entry system you need both a relay and a power supply for the magnet. On most magnet systems you should always fit an emergency break glass unit.
Elements of an Access Control System
| Product |
Application |
Limitations |
| Electro Magnet |
General purpose electronic locking system for doors etc. Always fail safe |
Cannot be used on double swing doors. |
|
Magnet
L Bracket
|
Used for mounting a magnet on an outward opening door. |
May interfere with head height. |
Magnet
Z Bracket |
Used for mounting a magnet on an inward opening door. |
Aesthetic |
| Exit Button |
For local release of a door |
Choose low or high traffic appropriate. |
| Emergency Break Glass |
For emergency release of a fail safe locking device. |
Must not be used as a an exit button. |
| Keypad |
Allows coded entry through door |
Not suitable for a large number of users. |
| Reader |
Uses cards or fobs to allow access through a door. |
Choose suitable system for the situation. |
To download the full Newlec Guide to Access Control click here or visit our literature download section.
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