Standby fire protection service connections of two-inch size or larger shall be installed by the city if adequate provisions are made to prevent the use of water from such services for purposes other than fire extinguishing. Sealed fire sprinkler systems with water-operated alarms shall be considered as having such provision. The city may require that a suitable detector-check meter be installed in the standby fire protection service connection to which hose lines or hydrants are connected. All costs for standby fire protection service connections shall be paid by the applicant. No charge will be made for water used in the standby fire protection services to extinguish accidental fires or for routine testing of the fire protection system. If water is used from a standby connection service for purposes other than to extinguish accidental fires or for routine testing of the fire protection system, an estimate of the amount used will be computed by the superintendent and the customer shall pay for the water so used at regular rates. (Prior code § 3.235)