PARK LIGHTING 815 



Maintenance. Cleaning and lighting and replacement of lamps to be 

 done by the Minneapolis General Electric Company under yearly contract. 

 Replacement of glassware, poles, transformers, and repairs to conduits to 

 be done by the General Electric Company at cost plus a fixed percentage. 

 Current to be paid for at metered or at flat rates as per pending agreement. 

 The responsibility of maintaining the lighting system in efficient operation 

 should be left with the utility company. 



INSTALLATION 



Electrical service. The distribution of energy for the lighting system 

 of both parks and parkways shall be as recommended by the local utility 

 company. 



This consists of making use of the existing multiple system of distribu- 

 tion. Energy is fed into the system from the secondaries of transformers 

 on existing pole lines in proximity to the proposed installations. All light- 

 ing circuits are three-wire with a grounded neutral. The two outside wires 

 are standard N. E. C. lead-covered cable with a covering of asphalted jute 

 for mechanical protection. The neutral is a weatherproof wire grounded 

 and bonded to the lead sheaths of the two cables of each standard. Four 

 hundred and sixty volts are impressed across the two outside cables with 

 230 volts from each side to the neutral or to ground. 



In general, 6,000 lumen lamps requiring a current of 20 amperes and 

 a voltage of 15.5 are to be used, and change in energy is to be effected by 

 a transformer located in the base of each standard. 



As in some cases, winter lighting will require service from alternate 

 lamps only; a fuse in the base of each standard is to be provided for mid- 

 winter cutout. The three-wire arrangement is also flexible in the control 

 of lamps, permitting if desired midnight lighting only. 



Standards for parkway illumination. Design. The standards shall be 

 designed for a mounting height of from 1 8 to 23 feet, with bracket of suffi- 

 cient length to extend three feet over the curb line. 



Standards: Spacing, location, and mounting height. The standard shall 

 be spaced from 160 to 200 feet apart, as conditions demand and as indicated 

 on the accompanying plans. The mounting height of lamps shall be from 

 18 to 23 feet, depending upon varying conditions on different parkways. 

 The standard shall be set two feet back of curb lines which with a five-foot 

 bracket will permit a three-foot overhang of lamps. 



Standards for playgrounds and parks. Standards for park lighting shall 

 in general be placed along park walks at spacing of approximately 100 feet, 

 these standards to be 12 feet in height. Playground standards shall be 

 placed as indicated on the plans and in relation to playground equipment, 



