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Fire alarm control panels are powered by the mains power. Commonly, the fire alarm will have a battery back up power in place so that the system still remains functional and powered up when the mains fails. When the mains is powering the panel, the batteries are charged fully so that when a power cut occurs, they have enough power to operate the system for a certain amount of time. Generally, in the UK, a panel is powered by 240 Volts and is stepped down by a transformer to 24 Volts. The panel will usually have two, 12 Volt batteries installed in the panel- they are reffered to as SLA's. (Sealed Lead Acid). These batteries though will only last for about a day or two.

Some systems are larger and have more power drain, so they may be required to have additional backup batteries connected and perhaps spares available on site. If the fire alarm system is non-operational, the local fire authorities may require a company to post a 24-hour "fire warden", in case of fire, with adequate training and equipment, or otherwise shutter the business until the alarm is working.

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