MO.tool
STANDARDS & FORMULAS

Master Details

The typical installation details of every system, drawn from the model’s own families and architecture.

Standards and regulations

  • NFPA 72
    National Fire Alarm and Signaling Code

    Detector spacing, manual call points, notification appliances and installation notes.

  • BS 5839-1
    Fire detection and fire alarm systems for buildings (non-domestic premises)

    The BS option of the installation details and notes.

  • BS 7671
    Requirements for Electrical Installations (IET Wiring Regulations)

    Saddle spacing (Table 4A) in the BS details.

  • NEC 358.30
    EMT securing and supporting

    Straps within 900 mm of every box, 3 m apart at most (NFPA / NEC details).

Design rules it applies

  • Choose NFPA or BS: the notes and the cable change with it
  • BS: detectors not within 500 mm of a wall nor 1 m of an air inlet; call points at 1.4 m
  • NFPA: detectors 100 mm from a wall, 914 mm from supply diffusers; pull stations 1070 – 1220 mm

For reference. MO.tool works these out to help your design; the engineer remains responsible for it. Always check the edition of each standard your project uses and the requirements of the local authority (DEWA, ADDC, Civil Defence…).

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