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Building Ordinance continued -9- (d) Temporary services shall have a -minimum of 10 feet clearance, be of approved material and be properly braced and supported. (e) Only threaded thick wall metal conduit will be accepted when exposed to the weather and it must be galvanized, or its equivalent. Electrical metallic tubing may be used from meter socket to entrance switch, of not exposed to the weather. (f) Meter rooms shall be provided in all buildings of multiple occupancy (four or more occupancies) and shall have a minimum requirements of: 4 to 8 meters --4' X 6' X 7' inside diameter and if the electrical requirements and demand is larger, the meter room shall be increased accordingly. This meter room shall be equipped with a ventilated door, and approved lock which may be locked only with the approval of the Electrical Inspector. The meter room shall be accessible to all occupancies of the building at all times. The meter shall be provided with adequate ventilation. The purposes of this room shall be to house and main switch or main switches, disconnecting equip- ment and its control devices, terminal equipment for telephone service (in separate area from electrician's area) and all the electric meters which serve the occupants throughout the entire building. The con- struction of this room shall conform to the same type of material and construction as the main building, and there shall be no storage of any kind, gas meters, or water heaters permitted in this room. (g) Service disconnecting switches must be located in a convenient and readily accessible place inside the building when a meter room is not available. The service disconnecting switch or switches, and other disconnecting equipment located in enclosed or semi -enclosed porches not exposed to the weather, shall be considered as being located inside the building. (h) Service disconnect shall be located at the nearest point of service entry not to exceed 25 feet and shall not be installed in bathrooms, bedrooms, closets or kitchen cabinets. (i) All 220 volt circuits must be protected with car- tridge fuses or double pole breakers. (j) All main switches and sub -main switches shall be plainly marked so that the division, sub -division, or separate occu- pancies of the building which they control can be quickly and posi- tively identified. The mark of identification shall be securely affixed to the switch to prevent its loss or 'misplacement. (k) All service grounds shall be equipped with ground rods, not less than 8 feet in length. Water pipe systems will not be allowed. (1) The service and equipment ground must be taken from the nearest possible point of the system service after the service is attached to the building. This ground must start at the meter socket, main switch or C. T. can. Point of attachment of ground clamps or approved ground connectors shall be readily accessible, and shall not be in attics, under floor or behind any equipment. (m) All current transformer installations shall be color coded as follows with minimum wire size of ()12: 2 red, 2 black, 2 yellow, and 1 white common, with number four (4) copper wire to an approved ground. Section 26. Commercial Construction.