From where did the number 3 come from in computing the G? Example 5-1: An office

Question

From where did the number 3 come from in computing the G? Example 5-1: An office building contains a number of small (40 m2) rooms, each of which has four two-lamp fluorescent fixtures. Every time a main- tenance person changes lamps, they must bring a ladder into the room and clear away furniture. It takes the person 15 minutes to replace one lamp. It takes 25 minutes to replace all the lamps in a room and clean the luminaires if all the work is done at one time. The lamps cost 0.85 each, and labor costs are 10/hour. The lamps are used about 2000 hours/year The average lamp life is 20,000 hours. Determine whether group relamp- ing with I-0.8 is preferable to spot relamping for this building. Solution: Find the cost for spot relamping and group relamping using equations 5-1 and 5-2, and select the method with lowest cost. €0.85 per lamp -15/60x 10 2.50 3/60x 10 0.50. L- (time to replace lamp in hours) × (cost of labor per hour) Gtime to replace lamp in hours) x (cost of labor per hour) 1.0s and thus Capot 0.85+2.50 3.35/1amp =(0.85 + 0.50/0.50 cgrup soupe1.69 lamp

Explanation / Answer

it took 25 min to take out all the lamps and replace and clean them. but in the formulae, we need only the time required to replace the lamps not to clean them

the number 3 in computing the G signifies the group effect for time to replace a lamp

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