Sample Fire Alarm System Calculations

Rpsa fire PROTECTION ENGINEERS. SCHIFILITI ASSOCIATES, INC. Box 297. Reading, Massachusetts 01867 - 0497. USA. Fax / Data Telephone Sample fire Alarm System Calculations 1. A fire Alarm manufacturer specifies a maximum allowable loop resistance of 50 1. What is the maximum allowable distance from the control unit to the last device if a #16 AWG. stranded, un-coated copper wire is used? Assume a temperature of 750C. How does this change if the temperature is 200C? Rmax = 50 1 = 2 RW 1 R. W. R W = Ru D 1 R. W. Rmax = 50 1 = 2 Ru D 1. Ru = 1/1000 ft or 1 per handout table for D=L/2. #16 AWG stranded, uncoated copper wire at 750C. Rmax 50. D= = = 5010 = 5000 ft 2 Ru 2( ). Part B If T = 200C calculate the unit resistance, Ru, at the lower temperature (it should be less since resistance is lower at lower temperatures leading to super cooled super conductors): R2 = R1 [1 + 9 (T 2 - 75)] where: 9Cu = R2 = [1 + (20 - 75)] 1/ft or R2 = [1 + (20 - 75)] 1/1000 ft R2 = 1/ft Rmax 50.

rpsa File: Sample Fire Alarm System Calculations.DOC Page 2 05 October 2000 rpsa FIRE PROTECTION ENGINEERS 3. Plot total loop resistance, RT, as a function of circuit distance (D = L/2) for 14, 16, 18, 22 and 24 AWG uncoated solid copper wire.

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