Electric strikes Electric strikes are installed in a door frame where the strike plate is usually mounted. It includes a plate called the keeper or gate which is electrically released to swing out and thereby allows the latch to move through the space the keeper has vacated. There are several different types of electric strikes. Most electric strikes require 12 or 24 volts DC, and they may be fail-safe or fail-secure. A fail-safe electric strike needs power to remain locked, and is not commonly used. The most common type of electric strike is fail-secure. A fail-secure electric strike stays locked even without power from the outside coming in. To exit, a door knob or lever on the entry lockset is manually operated. Since the electric strike is not needed for this, it allows for safe exit. To provide an audible indication that the door is unlocked, DC-powered electric strikes will make a slight click when operated.1 It should be noted that the ESI Presence Management RFID Reader emits a confirmation tone when the door control relay is operated; therefore ESI recommends that a DC-powered electric strike be used with the RFID Reader for door access control. Electromagnetic locks Electromagnetic locks (magnalocks) are designed to secure any type of door or gate that closes against a fixed stop. All magnetic locks will work only with DC current, usually 12 to 24 volts. All electromagnetic locks are fail-safe. This means that they need a constant source of current to remain locked: if power is removed, the lock will open. All electromagnetic locks are silent, even when powered and locked. The lock consists of an electromagnet which mounts on the door frame and a strike plate which mounts on the moving door or gate. The strike plate is mounted in such a way that, when the door closes, it automatically self-aligns with the magnet. Magnetic force then takes over, strongly securing the door. Release is achieved by switching off power to the magnet. This type of lock secures the door from both entering and exiting, and there is no alternate method of unlocking the door. Important: Electromagnetic locks can be dangerous with respect to fire and smoke safety if not installed properly. Because of this, installation of this type of lock must be done by a licensed professional in most, if not all, areas. Before planning an installation it's very important to always check with the Local Authority Having Jurisdiction. Electric deadbolts Electric deadbolts come in several different styles, and as with electric strikes, they come in fail-safe and fail-secure configurations. The deadbolt is operated via a solenoid in the lock housing. Some models have a manual cylinder that allows exit without operating the solenoid. However, because electric deadbolts are installed separate from a standard entry lockset, they can be as dangerous as electromagnetic locks if not installed properly. Because of this, installation of this type of lock must be done by a licensed professional in most if not all areas.