(2) Ductless split systems, split A/C systems
(a) Wiring methods for ductless split systems
Cables and wiring methods permitted by Section 12 for interconnection of units in
ductless mini-split air conditioners, shall be used if suitable for termination.
In addition, ESA will permit TC-ER cable (certified to CSA standard C22.22 No.230) to
be used for interconnection of units in ductless mini-split air conditioners installations
provided that it is installed:
- as per Rules 12-508, 12-512, 12-518 and 12-520;
- continuously supported; and
- not pulled through joists (structural members).
TC-ER cables comply with the crush and impact requirements of armoured (or metal
clad) cables. Based on Rule 12-602 1), similar to armoured cables, TC-ER cables will
be permitted to be installed on a building while being continuously supported.
Flexible cord (such as SJOOW (see Photo 3) is not allowed by the OESC Rule 12-402
3) to be used as a substitute for the fixed wiring of structures and shall not be
(i) permanently secured to any structural member;
(ii) run through holes in walls, ceilings, or floors; or
(iii) run through doorways, windows, or similar openings;
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