MultiIFAX multi-loop System

Commercial Alarm System Design

Multi Alarm GB can design a wide variety of Fire Detection & Alarm Systems from simple stand-alone systems to complex networked systems, from small buildings to full shopping centres, from ancient Cathedrals to new offices. Multi Alarm GB carry out Site Surveys, Fire Engineering reports, initial System Design and detailed Design Testing & Simulation.

Multi Alarm GB follow a procedure, approved to BAFE SP203, to proceed from your requirements to a System Design Specification.

The first stage is for Multi Alarm GB to ascertain your requirements. This might be a specification supplied by you either written or verbal. We would normally request drawings of the premises to be protected. If drawings are not available then a Site Survey would be carried out by Multi Alarm GB.

The use or intended use of the premises is ascertained and risks are evaluated. From this, the required standard and ‘type’ of System can be established. Also, the requirement or desirability of automatically summoning the fire brigade is considered.

Interfaces with other building services and fire protection equipment are considered and noted. Depending upon site circumstances, the following options and features may be offered to you:

  • Sounder Delays
  • Detector Mode Switching
  • Staged Evacuation
  • Remote Control and Indicator Panels
  • Graphic Displays
  • Mimic Panels

The system is divided into Zones in accordance with the required standards. Detectors are positioned in accordance with the required standards, taking into account factors that might give rise to false alarms. The types of Fire Detectors (Optical, Ionisation, Carbon Monoxide, Heat, Multi Criteria, Optical Beam, Flame etc.) are defined as appropriate. Manual Call Points are positioned in accordance with the required standards, taking into account the travel distances and exits. Sufficient Sounders are included to reach the desired audibility, taking into account sound attenuation caused by doors etc.

The maximum time that the building is likely to be unmanned is ascertained in order to determine the standby period and battery capacity. Power Supply Calculations are carried out to ensure that the power supply unit can operate the system on full alarm load with or without the standby battery in circuit. Battery Capacities are calculated to give the required standby period plus an alarm period at the end of the standby period.

Loop Calculations are performed to determine the optimum size and maximum length of cable. Multi Alarm GB can perform a detailed Design Simulation to prove and demonstrate the cause-and-effect operations. This is particularly useful in complex designs. Multi Alarm GB make extensive use of Discovery SimSystem loop simulators and we are able to simulate large systems containing several networked Control Panels.

Discovery SimSystem loop simulator software in use

Discovery SimSystem loop simulator software in use

The System Design Specification is drawn-up and includes the following:

  • Design Statement
  • Any Limitations of the System as Designed
  • Control Equipment Specifications, including power supply and batteries
  • Fire Alarm Initiating Devices Specifications
  • Fire Alarm Sounder Specifications
  • Cause and Effect Table
  • Schedule of Equipment
  • Extent of Works to be done by Multi Alarm GB
  • Extent of Works to be done by others, including responsibility to inform us of any changes to the building that may affect the fire alarm design
  • Cable dimensions, type and maximum cable lengths
  • Mains Power Supply Requirements
  • Installation Standards
  • Drawings showing equipment positions and Zones
  • Battery and Power Supply Specifications
  • Loop Cable Specifications