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3.6.1 Electrical Services
a. All service conduits shall not penetrate directly through the walls and slabs of the SS.
b. Only service conduits serving the SS shall embed within the SS walls and slabs. Service conduit for electrical and communication fixtures which are located on external face of SS wall may also be embedded in the SS wall. Other than these, all service conduits which do not serve the SS shall not embed within the SS wall and slab.
c. A maximum of ten numbers of 25mm diameter service conduits for electrical and communication cables serving the SS, and for electrical and communication services which are located on external face of SS wall, are allowed to be embedded in the SS walls. Both ends of these concealed conduits shall be fully sealed with sealing material in accordance with the manufacturer’s specification and up to a depth of not less than 100mm into the conduits to ensure air-tightness of the SS.
d. Two cast-in service outlets located directly back-to-back on the internal and external faces of the SS wall are not permitted (refer to FIGURE 3.6.1(a)). Service outlets shall be fixed with at least a clear distance of 300mm between each other. Refer to FIGURE 2.10.
e. Where service cables and fixtures in the SS are exposed on internal walls and slab, non-metallic inserts are to be used for their mounting. For embedded service cables and fixtures serving the SS, the details shall be as shown in FIGURE 3.5.4(e). The encasement of switch socket outlets, communication line for telephony outlet and switches of Clause 2.6 shall be galvanised steel. Refer to FIGURE 3.6.1(b).
3.6.2 Water and Gas Services
Water and gas services are allowed to pass through the SS walls provided that they are laid within a stainless steel conduit encased by 150mm reinforced concrete all round. Refer to FIGURE 3.6.2. Joints in the pipes or in the stainless steel conduit shall be located outside the SS. Risers for services can be mounted on the external face of SS tower walls.
3.6.3 Refuse Chute and Gas Risers and any other service risers within setback distance of SS and S/C SS
Refuse chute and gas risers and service risers can be mounted on the external face of SS walls. Where this structure protrudes above the roof, it shall be designed with a minimum 300mm reinforced concrete all round and reinforcement details are as shown in FIGURE 3.6.3(a) to 3.6.3(c).
