Except for motor vehicles utilized for personal use by authorized personnel of the Fire Department, no fire truck, apparatus or equipment owned by the city, unless authorized by the Chief of the Fire Department, shall be taken, transported or used beyond the corporate limits of the City by any person except in cases where City property is endangered or where such service is requested by municipal officer of other cities and towns; provided, that where the City has contracted to provide fire protection to another political subdivision of this State or for the protection of the persons and property in such subdivision, the provisions of this section shall not apply.