Notes to Table 3.2.3.7.:
3.2.7.10. Protection of Electrical Conductors (1) Electrical conductors shall conform to Sentences (2) to (9) and (11) if they, (a) are within buildings
identified in Article 3.2.6.1. and serve, (i) fire alarm systems, or (ii) emergency equipment within the scope of Articles 3.2.6.2. to 3.2.6.8., (b) serve fire pumps required to be installed under Article 3.2.5.19., (c) serve mechanical systems related to, (i) compartments referred to in Clause 3.3.3.6.(1)(b), (ii)  contained use areas referred to in Clauses 3.3.3.7.(4)(a) and (b), or (iii) provisions of Articles 3.2.8.4. to 3.2.8.6. and 3.2.8.9., or (d) serve emergency lighting described in Article 3.2.7.3. (2) Except as required by Sentence (3) and except as permitted in this Article, electrical conductors referred to in Sentence (1) shall, (a) conform to CAN/ULC-S139, “Fire Test for Evaluation of Integrity of Electrical Power, Data and Optical Fibre Cables”, including the hose stream application, to provide a circuit integrity rating of not less than 1 h, or (b) be located in a service space that is separated from the remainder of the
building by a fire separation
that has a fire-resistance rating of not less than 1 h. (3) Electrical conductors that are used in conjunction with systems referred to in Clause (1)(c) shall, (a) conform to CAN/ULC-S139, “Fire Test for Evaluation of Integrity of Electrical Power, Data and Optical Fibre Cables”, including the hose stream application, to provide a circuit integrity rating of not less than 2 h, or (b) be located in a service space that is separated from the remainder of the
building by a fire separation
that has a fire-resistance rating of not less than 2 h. (4) The service spaces referred to in Clause (2)(b) or (3)(b) shall not contain any combustible
materials other than the electrical conductors being protected. (5) Except as permitted by Sentences (7) and (9), the electrical conductors referred to in Sentence (1) are those that extend from the source of emergency power to, (a) the equipment served, or (b) the distribution equipment supplying power to the equipment served, if both are in the same room (6) If a fire alarm transponder or annunciator located in one fire compartment is connected to a central processing unit or another transponder or annunciator located in a different fire compartment, the electrical conductors connecting them shall be protected in accordance with Sentence (2). (7) Fire alarm system branch circuits within a storey
that connect transponders and individual devices need not conform to Sentence (2). (8) Except as permitted by Sentence (9), if a distribution panel supplies power to emergency lighting, the power supply conductors leading up to the distribution panel shall be protected in accordance with Sentence (2). (9) Conductors leading from a distribution panel referred to in Sentence (8) to emergency lighting units in the same storey
need not conform to Sentence (2). (10) Distribution panels serving emergency lighting units located on other storeys
shall be installed in a service room separated from the floor area by a fire separation having a fire-resistance rating
of at least 1 h. (11) Conductors leading from a distribution panel referred to in Sentence (10) to emergency lighting units located on other storeys shall be protected in accordance with Sentence (2) between the distribution panel and the floor area where the emergency lighting units are located. 3.2.8. Mezzanines and Openings through Floor Assemblies