--- title: Wiring a Fail Safe Lock description: How to connect a Fail Safe lock to the Alocity F3D100 Reader --- [Skip to content](https://help.alocity.com/knowledge/connecting-an-electric-strike#main-content) English Show submenu for translations [SUBMIT A TICKET HERE](https://help.alocity.com/knowledge/kb-tickets/new?hsLang=en) [![Alocity](https://help.alocity.com/hs-fs/hubfs/alocity-logo%20Full.png?width=181&height=48&name=alocity-logo%20Full.png)](https://www.alocity.com/) Open main navigation Close main navigation - English Show submenu for translations - [SUBMIT A TICKET HERE](https://help.alocity.com/knowledge/kb-tickets/new) - [Contact Support Now](mailto:support@alocity.com) [Contact Support Now](mailto:support@alocity.com) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Alocity Help Center (Knowledge Base)](https://help.alocity.com/knowledge?hsLang=en) 2. [F3D100 Installation, Setup And Configuration Guide](https://help.alocity.com/knowledge/f3d100-installation-setup-and-configuration-guide?hsLang=en) 3. [F3D100 Installation and Wiring](https://help.alocity.com/knowledge/f3d100-installation-setup-and-configuration-guide?hsLang=en#f3d100-installation-and-wiring) # Wiring a Fail Safe Lock ## How to connect a Fail Safe lock to the Alocity F3D100 Reader When connecting the Alocity F3D100 Reader directly to an electric lock, it's important to understand the type of lock being used. In this section, we'll discuss connecting the reader to a Fail Safe lock. **Important Notice 1: Incorrect installation of the diode as per the specifications outlined in section 4 of this guide will result in damage not immediately visible on the equipment but will void its warranty. Please adhere strictly to the instructions in section 4 to prevent any adverse impact on the device warranty.** **Fail Safe Lock:** A Fail Safe lock typically has a current flowing through the relay when in its normal state. When the relay is activated, the current flow is blocked, and the door lock will open. If the power supply is cut off due to a power failure or an external factor, the door will remain open for safety reasons. Follow these steps to properly wire the Alocity F3D100 Reader to a Fail Safe electric lock: 1. Connect both NC (Blue/Yellow) wires to the positive (+) wire on the lock. 2. Attach the negative (-) wire from the power source to the negative (-) terminal on the lock. 3. Connect the two COM (Brown/Red) wires to the positive (+) wire on the power source. 4. When installing the Alocity F3D100 reader, use provided diodes on each side of the door lock wiring, ensuring correct placement next to the door lock (avoiding installation on power sources or device wiring), and proper soldering (splicing won't suffice) to protect the relay from voltage backflow during door lock operations. Improper installation may lead to random failures (LED, device, or communication issues) at unspecified intervals (2 hours to 2 weeks), potentially causing permanent damage to the device; note that diodes are applicable only in DC circuits. **Important Notice 2: Each wire can support up to 1A of current. By connecting them together, the circuit can handle up to 2A of current, refer to your lock’s manufacturer documentation to confirm that the maximum load capacity of your lock does not exceed the circuit's capacity, otherwise you might damage the device and void the warranty.** ![](https://help.alocity.com/hs-fs/hubfs/undefined-1.png?width=633&height=343&name=undefined-1.png)   Note: For configuring the relay and door lock settings  in your access control system, please consult the *Alocity Software User Guide*. 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