Transcription of Sample Fire Alarm System Calculations
{{id}} {{{paragraph}}}
Example: air traffic controller
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 3 05 October 2000 rpsa FIRE PROTECTION ENGINEERS Loop Resistance (Loop is 2 x D) (Solid, uncoated copper at 75 0C)
Loading..
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document:
Related search queries
Voltage Drop Calculations, Cooper Industries, Voltage Drop Calculations Copper Conductors, Chapter, Calculations, Voltage, Drop, Wire Size and Length Determination, Voltage drop, AND WHY OF OBTAINING ACCURATE, Conductors, Equipment Grounding Conductor, Licensed Electricians Practical Assessment LEP, TOPIC STUDENT MINIMISING