This chapter covers the installation, verification, and troubleshooting of fire alarm, security, and communication systems. For the Red Seal exam, you must master the operating principles, the requirements of the Canadian Electrical Code (CE Code) , applicable CSA standards, as well as installation and commissioning procedures. These systems are Class 1, Class 2, or Class 3 circuits depending on their electrical characteristics, and their wiring must comply with specific rules that are distinct from power circuits.
1. Fire Alarm Systems
1.1 Fundamental Principles
The function of a fire alarm system is to detect a fire, alert occupants, and transmit a signal to a central station. It consists of:
Power sources: primary power supply and standby power supply (batteries).
Systems are classified according to their configuration:
Type
Description
**Conventional**
Each detector is connected to a zone circuit; the zone is identified, but not the individual detector.
**Addressable**
Each detector has a unique address; the panel precisely identifies the device that was activated.
**Analog**
The panel receives continuous values from each detector, allowing gradual assessment (pre-alarm, alarm).
1.2 Wiring and Circuits
Fire alarm system wiring must comply with the Canadian Electrical Code, Part I (CE Code) . The main rules:
Rule 32-100: Fire alarm circuits must be installed so that they are not affected by power circuits. Wiring must be physically separated or run in separate conduits.
Rule 32-102: Conductors must be a minimum size of AWG 18 (0.82 mm²) for control circuits, unless otherwise specified by the manufacturer.
Rule 32-104: Circuits must be protected against overcurrent; protection must not exceed 7 A for Class 2 circuits.
Rule 32-106: Conductors must be identified by a distinct colour (red for fire alarm circuits, except for the neutral and ground).
Important: Fire alarm circuits are generally Class 2 circuits according to the CE Code (Section 16), which limits voltage to 30 V and power to 100 VA for power-limited circuits. Class 1 circuits (voltage above 30 V) require wiring that complies with power circuit rules.
1.3 Smoke Detectors
Smoke detectors operate on two principles:
Ionization: An ionization chamber contains a small radioactive source (americium 241). Smoke particles disrupt the ionic current, triggering the alarm. Effective for fast-flaming fires.
Photoelectric: An LED emits a light beam; smoke scatters the light toward a photodiode. Effective for smoldering fires.
Installation requirements (according to the National Building Code and CSA standards):
Smoke detectors must be installed in each bedroom, in adjacent hallways, and on every floor.
Maximum spacing: 9 m between detectors on a smooth ceiling, and 4.5 m from walls.
Detectors must be mounted at least 100 mm from the ceiling (on a wall) or on the ceiling, at least 500 mm from any obstruction.
1.4 Heat Detectors
Heat detectors respond to a fixed temperature (typically 57 °C or 88 °C) or to a rate-of-rise in temperature (for example 8 °C/min). They are used in areas where smoke is normal (kitchens, garages).
Fixed-temperature type: Activates at a predetermined temperature.
Rate-of-rise type: Activates if the temperature increases faster than a given threshold.
1.5 Audible and Visual Notification Appliances
Notification appliances must produce a sound level of at least 75 dB at the head of beds in bedrooms, and 90 dB in assembly areas. Strobes must be synchronized to prevent photosensitive epilepsy; the flash rate must be 1 Hz (one flash per second) or 2 Hz according to CSA C22.2 No. 141.
1.6 Power Supply
The primary power supply comes from the distribution panel on a dedicated circuit. The standby power supply consists of batteries:
Capacity: Batteries must provide the energy required for 24 hours in standby mode, plus 5 minutes in alarm mode (according to CAN/ULC-S524).
Capacity calculation: The capacity (in Ah) is calculated as follows:
Capacity (Ah) = (Standby current × 24 h) + (Alarm current × 0.083 h)
where 0.083 h = 5 minutes / 60.
Example: A system draws 0.2 A in standby and 1.5 A in alarm. Required capacity = (0.2 × 24) + (1.5 × 0.083) = 4.8 + 0.125 = 4.925 Ah. You would select a 7 Ah battery (standard value) for a safety margin.
1.7 Grounding and Bonding
The control panel must be grounded in accordance with Rule 10-200 of the CE Code. The ground electrode resistance must not exceed 25 Ω (Rule 10-500). All grounding conductors must be copper and a minimum of AWG 14 (2.08 mm²).
Access control systems: card readers, keypads, biometrics.
Video surveillance systems: IP or analog cameras, recorders (DVR/NVR).
Intercom systems: audio/video communication between stations.
2.2 Security System Wiring
Security circuits are generally Class 2 (voltage ≤ 30 V, power ≤ 100 VA). Wiring must comply with:
Rule 16-100: Class 2 conductors must be separated from power conductors by a barrier or sheath.
Rule 16-102: Class 2 conductors must not be installed in the same conduit as power conductors, unless the power conductor voltage is ≤ 300 V and the Class 2 conductors are insulated for that voltage.
Rule 16-104: Class 2 transformers must comply with CSA C22.2 No. 66.
Passive infrared detectors sense the infrared radiation emitted by the human body. They are sensitive to temperature variations within their field of view.
Typical range: 10 to 15 m, detection angle of 90° to 110°.
Installation: At a height of 2.1 to 2.4 m, oriented perpendicular to likely paths of travel.
Avoiding false alarms: Do not install near heat sources (radiators, heating ducts), windows exposed to sunlight, or facing pets.
2.4 Magnetic Contacts
Magnetic contacts consist of a reed switch and a magnet. They are installed on doors and windows.
Spacing: The magnet must be within 20 mm of the switch to ensure circuit closure.
Wiring: Two conductors (normally closed — NC) or four conductors (NC + normally open — NO).
2.5 Access Control
Access control systems use readers that validate a card, code, or biometric data. Typical wiring:
Reader → Controller: Twisted pair cable (Cat 5e) for data (Wiegand or RS-485).
Electric strike → Controller: 18/2 cable for strike power (12 V DC or 24 V DC).
Supply voltage: Electric strikes typically operate at 12 V DC or 24 V DC; current can reach 0.5 A to 1 A depending on the model.
2.6 Video Surveillance
IP cameras are powered using Power over Ethernet (PoE) according to IEEE 802.3af (15.4 W) or IEEE 802.3at (30 W). The maximum distance for an Ethernet cable is 100 m (rule of thumb). Beyond that, you must use an intermediate switch or a fiber optic converter.
PoE power loss calculation: The loss in Cat 5e cable is approximately 0.1 Ω/m (round trip). For a 50 m cable and a current of 0.5 A:
Loss (V) = 2 × 50 m × 0.1 Ω/m × 0.5 A = 5 V
If the source provides 48 V, the camera will receive 43 V, which is acceptable (typical range: 44 to 57 V). For 100 m, the loss would be 10 V, which can be marginal.
3. Communication Systems
3.1 Intercoms and Public Address Systems
Intercom and public address systems use Class 2 or Class 3 circuits depending on power. Speakers are typically 8 Ω or 70.7 V (constant voltage line).
Constant voltage systems (70.7 V): Used for large installations (schools, hospitals). Each speaker is equipped with a transformer with power taps (0.5 W, 1 W, 2 W, etc.). The total impedance seen by the amplifier is calculated as follows:
P total = Σ P of speakers
Z total = (70.7 V)² / P total
Example: 20 speakers at 2 W each → P total = 40 W. Z total = (70.7)² / 40 = 4998 / 40 ≈ 125 Ω. The amplifier must be capable of delivering at least 40 W at 70.7 V.
3.2 Communication Networks (Voice and Data)
Structured cabling for local area networks (LAN) must comply with the TIA/EIA-568 standard and the CSA T568 standard (Canadian equivalent).
Category
Bandwidth
Maximum data rate
Typical use
**Cat 5e**
100 MHz
1 Gbps
Existing networks, IP telephony
**Cat 6**
250 MHz
10 Gbps (55 m)
New installations
**Cat 6A**
500 MHz
10 Gbps (100 m)
Data centers, critical applications
Installation rules:
Maximum horizontal cable length: 90 m (between the patch panel and the wall outlet), plus 10 m of patch cords.
Minimum bend radius: 4 × the outer diameter of the cable.
Separation from power cables: At least 50 mm from power circuits ≤ 300 V, and 300 mm from circuits > 300 V (Rule 16-102 of the CE Code).
Cables must be secured at maximum intervals of 1.5 m.
3.3 Fiber Optics
Fiber optic cable is used for high-speed and long-distance links. Two main types:
Single-mode fiber: 9 µm core, used for distances > 2 km, wavelength 1310 nm or 1550 nm.
Multi-mode fiber: 50 µm or 62.5 µm core, used for distances < 2 km, wavelength 850 nm or 1300 nm.
Installation rules (CE Code, Rule 60-300):
Fiber optic cables must be identified and separated from power conductors.
Minimum bend radius: 10 × the outer diameter when installed, 15 × when pulling.
Connections must be made in accessible junction boxes or patch panels.
3.4 Antennas and Distribution Systems
Distributed antenna systems (DAS) and cellular signal amplifiers must be installed in accordance with CSA B149.1 (Natural Gas and Propane Code) only if gas generators are used. For electrical aspects, Rule 60-400 of the CE Code applies to antenna masts and supports: they must be grounded with a minimum AWG 6 (13.3 mm²) copper conductor.
4. Installation and Commissioning Procedures
4.1 Preliminary Verification
Before any installation:
110.Consult the plans and specifications to identify exact locations.
111.Verify that materials comply with standards (CSA, ULC markings).
112.De-energize existing circuits before working (lockout procedure — Rule 2-004 of the CE Code).
4.2 Cable Installation
Pull cables without exceeding the maximum pulling tension (typically 25 lbf or 111 N for Class 2 cables).
Use compliant conduits or cable trays for circuit separation.
Leave a 300 mm service loop at each end to facilitate connections.
4.3 Connections and Terminations
Strip conductors to 6 to 8 mm (depending on the terminal type).
Tighten terminal screws to the recommended torque (typically 0.5 to 0.8 N·m).
Verify polarity for DC circuits (12 V DC, 24 V DC).
Label each conductor and each device according to the plan.
4.4 Energization and Testing
123.Continuity test: Verify each circuit with an ohmmeter (expected resistance: < 1 Ω for short loops).
124.Insulation test: Measure the insulation resistance between conductors and between conductors and ground. The minimum value is 1 MΩ (Rule 32-110 of the CE Code for fire alarm circuits).
125.Functional test: Activate each detector, verify the activation of notification appliances and signal transmission.
126.Standby battery test: Simulate a power failure and verify that the system operates for at least 5 minutes in alarm.
4.5 Documentation
Complete the commissioning report (verification certificate).
Provide single-line diagrams and location plans.
Record test results (voltages, currents, resistances).
5. Essential Calculations and Formulas
Parameter
Formula
Example
**Battery capacity**
(I_standby × 24 h) + (I_alarm × 0.083 h)
(0.2 × 24) + (1.5 × 0.083) = 4.925 Ah
**Impedance of a 70.7 V line**
(70.7)² / P_total
(70.7)² / 40 = 125 Ω
**Voltage drop in a cable**
2 × L × R_linear × I
2 × 50 × 0.1 × 0.5 = 5 V
**Conductor resistance**
ρ × L / A
Copper: ρ = 0.0172 Ω·mm²/m
**Voltage drop (%)**
(ΔV / V_nominal) × 100
(5 / 48) × 100 = 10.4 %
Maximum voltage drop: For Class 2 circuits, the voltage drop must not exceed 10% of the nominal voltage (Rule 8-200 of the CE Code for utilization circuits).
6. Applicable Standards and Codes
Standard
Application
**Canadian Electrical Code, Part I (CSA C22.1)**
Electrical installation, Rules 16, 32, 60
**CAN/ULC-S524**
Installation of fire alarm systems
**CAN/ULC-S527**
Fire alarm control panels
**CSA C22.2 No. 141**
Audible and visual signaling appliances
**CSA C22.2 No. 66**
Class 2 transformers
**TIA/EIA-568**
Structured cabling (networks)
**CSA B149.1**
Natural gas and propane (if applicable)
Common Pitfalls to Avoid
140.Confusing Class 1 and Class 2 circuits: Class 2 circuits are limited to 30 V and 100 VA; beyond that, power circuit rules apply (conduits, sizes, protection).
141.Forgetting cable separation: Class 2 cables cannot be in the same conduit as power conductors, except under specific conditions (Rule 16-102).
142.Neglecting the standby battery calculation: Capacity must cover 24 h in standby + 5 min in alarm; an incorrect calculation can lead to system failure.
143.Using an inadequate conductor size: The minimum size for fire alarm circuits is AWG 18; for power circuits, it is AWG 14.
144.Ignoring voltage drop: Excessive voltage drop (> 10%) can prevent devices from operating, especially at the end of the line.
145.Poor detector placement: A smoke detector less than 500 mm from a wall or obstruction may not detect properly.
146.Not synchronizing strobes: Unsynchronized flashes can trigger epileptic seizures; the standard requires synchronization at 1 Hz or 2 Hz.
147.Forgetting to ground the panel: The control panel must be grounded with a minimum AWG 14 conductor, and the ground resistance must be ≤ 25 Ω.
148.Confusing conductor colours: Red is reserved for fire alarm circuits; white is the neutral; green or bare is the ground.
149.Not documenting tests: The Red Seal exam requires knowledge of verification procedures and reference values (1 MΩ insulation, 75 dB sound level, etc.).
Summary
Fire alarm, security, and communication systems are Class 1, 2, or 3 circuits; the class determines the wiring and protection rules.
The CE Code, Part I (Rules 16, 32, 60) and the CAN/ULC-S524 and CSA C22.2 standards govern installation.
Smoke detectors (ionization, photoelectric) and heat detectors (fixed, rate-of-rise) must be positioned according to precise spacing requirements (9 m max between detectors, 500 mm from obstructions).
The standby battery must provide 24 h in standby + 5 min in alarm; the capacity calculation is essential.
Security systems use Class 2 circuits; IP cameras use PoE (max distance 100 m).
70.7 V public address systems allow total impedance to be calculated using the formula Z = (70.7)² / P_total.
Commissioning tests include continuity (< 1 Ω), insulation (> 1 MΩ), and device functionality.
The maximum voltage drop is 10% for Class 2 circuits (Rule 8-200).
Complete documentation (diagrams, test reports) is mandatory.
Exam Tips
Memorize key values: 75 dB (sound level), 1 Hz (strobe), 24 h + 5 min (battery), 1 MΩ (insulation), 25 Ω (ground), 10% (voltage drop).
Practice the calculations: Battery capacity, 70.7 V impedance, voltage drop, conductor sizing.
Review Rules 16, 32, and 60 of the CE Code: Questions often focus on circuit separation, minimum conductor sizes, and conductor colours.
Visualize the diagrams: Be able to identify a conventional vs. addressable circuit, and the components of a fire alarm system.
Answer in terms of national standards: Never cite provincial regulations; refer to the CE Code and CSA/ULC standards.
