can form part of a manual alarm system or an automatic alarm system. There will be an indicator on the monitoring unit for visual indication to locate the call point easily, and there should be a visual identifier of the unit which triggered the alarm, typically a mechanical flag that operates on a latch and must be manually reset, e.g. by a key. Previously, the old British standard did not allow hinged covers and plastic resettable elements. Plastic elements must have the same printing as the EN 54 glass. In the US and Canada, alarm initiating devices with button-like designs are sometimes used in high-hazard occupancies. The NFPA 72 standard uses the term Alarm Box, which could encompass a number of initiation mechanisms. A few manual call points have been approved to UL/UL Canada standards. At the time of this writing, the pull station is still the most prominent design in this part of the world. A report by the UK-based Building Research Establishment (BRE) stated "there is a commonly held view that equipment designed to meet the European EN54 Fire detection and fire alarm systems standard cannot be used within an installation designed to the US National Fire Alarm Code, NFPA 72." In actuality, "there appears to be no requirement in NFPA 72 that precludes the use of manual call points..." Temporary MCPs It is becoming increasingly common in the UK and Europe for wireless MCPs to be used in temporary environments such as construction sites. These typically provide the same level of protection as a standard wired fire alarm installation, but can be moved around as needed in the changing environment of a building under construction without the need for specialist electrician installation. They often combine call point functionality with sounder and strobe functions for ease of installation. Such systems typically operate a similar structure to a standard wired fire alarm network, in that Manual Call Points may be mixed with automatic fire detection in the form of heat detection and smoke detection (often specially designed to be dust resistant, due to the increased likelihood of dust on a construction site) and can be connected to a monitoring base station unit. This unit provides visual identification of the triggering unit in any alarm, and should also be able to monitor radio signal strength (which may change as the build progresses) and battery life. Due to their use for