<P> This function, also abbreviated to "ACK", is used to acknowledge an abnormal situation such as an alarm, trouble or supervisory . This usually stops the panel piezo from sounding and makes the active LED go solid . </P> <P> Also known as "manual evacuation" or "evacuate". On panels that have this function, the drill function activates the system's notification appliances, often for purposes of conducting a fire drill . Using the drill function, an alarm is normally not transmitted to the fire department or monitoring center . However, building personnel often notify these agencies in advance in case an alarm is inadvertently transmitted . </P> <P> Also known as "alarm silence" or "audible silence". Depending on the configuration of the alarm system, this function will either silence the system's notification appliances completely or will silence only the audible alarm, while strobe lights continue to flash . Audible silence allows for easier communication amongst emergency responders while responding to an alarm . This can also be used during construction as a means of a preliminary test, before the final full test . Audible silence is usually used right after the emergency has been dealt with and the building is ready to be reoccupied again . A system reset usually comes right after . </P> <P> Also known as "flash test". This button is still used on many panels . This function is used to check the condition of the LEDs themselves . A "Lamp Test" button is required by code on multi-zone panels installed in Canada . Many panels do a lamp test when the system is reset . </P>

When is a fire alarm control panel required