- DL manuals
- Calculated Industries
- Calculator
- ElectriCalc LT
- User Manual
Calculated Industries ElectriCalc LT User Manual
Summary of ElectriCalc LT
Page 1
Electricalc ® lt an electrician's utility for wiring user's guide.
Page 2
Important note on user responsibility due to the serious nature of electrical installations, the user of this calculator must be certain that he or she is using it correctly, i.E., in accordance with both the following instructions and national electrical code ® requirements. This tool was designed ...
Page 3: User'S Guide — 1
User's guide — 1 introducing the electricalc ® lt the electricalc ® lt is an invaluable calculator for today’s busy electrical professional. Unlike a regular calculator, it has intuitively labeled “electrical keys” and conforms to the 1999 national electrical code, allowing you to solve code-related...
Page 4: 2 — Electricalc Lt
2 — electricalc lt table of contents key definitions ................................................. 3 default settings .............................................. 16 basic math operations .................................. 17 percent calculations...................................... 17 memory...
Page 5: User'S Guide — 3
User's guide — 3 key definitions standard calculator functions [on/c] — on/clear turns on power. Pressing once clears the last entry and the display. Pressing twice clears all non-permanent values. [off] — off turns all power off. Clears the memory and most internal registers. [set] — second functio...
Page 6: 4 — Electricalc Lt
4 — electricalc lt [m+] — cumulative memory adds displayed value to memory (e.G., 10 [m+], 20 [m+], [rcl] [m+] = 30). Clears when the calculator is shut off. [set] [m+] — memory minus (m − ) subtracts the displayed value from memory. [+] [–] [x] [÷] [=] arithmetic operation keys. [set] [–] — change ...
Page 7: User'S Guide — 5
User's guide — 5 mode "set-up" functions [set] [x] — all-clear (ac) resets all settings and values to their default settings. [cu/al] — copper/aluminum used to toggle between copper (default) and aluminum wire types. When the wire type is revised, any calculated wire size will be re-calculated autom...
Page 8: 6 — Electricalc Lt
6 — electricalc lt [set] [9] — 90°c wire insulation sets calculator to 90°c insulation type for wire size calculations. Displays: 90. [set] [2] — ambient temperature permanently enters ambient tempera- ture for determining ampacity derived wire sizes. Ambient temperature will only change when enteri...
Page 9: User'S Guide — 7
User's guide — 7 electrical functions [kilo-] — kilo- this key is used with watts, amps, volts, and volt-amps to identify "kilo-" values. [set] [kilo-] — milli- this key is used with other keys watts, amps, volts, and volt-amps to identify "milli-" values. [amps] — amps enters or calculates amps (us...
Page 10: 8 — Electricalc Lt
8 — electricalc lt [watts] — watts enters or calculates watts (using amps, volts, and va or horsepower). Displays: watt, kw, or mw. [set] [watts] —power factor enters or calculates power factor per- centage (based on watts and va). De- faults to 100%. Entered or calculated power factors greater than...
Page 11: User'S Guide — 9
User's guide — 9 ampacity tables the electricalc lt uses nec table 310-16 (310-17 for free air) to find wire sizes and ampacity ratings of wires. The calculator uses the following data to calculate wire size: 1) insulation tem- perature rating (60°c, 75°c and 90°c), 2) wire material (copper or alumi...
Page 12: 10 — Electricalc Lt
10 — electricalc lt ♦ second press if a wire length has been entered, the second press displays the smaller of the two wire sizes. If not solving for voltage drop wire size, then displays the maxi- mum ampacity. ♦ third press if a wire length has been entered, dis- plays the minimum wire ampacity ra...
Page 13: User'S Guide — 11
User's guide — 11 displays the maximum adjusted am- pacity of the calculated parallel wire size. Displays: wire a. Note: some areas may not allow par- alleling conductors. Users must know the jurisdiction requirements for their area. [set] [parsz] — derated wire size used to calculate derated wire s...
Page 14: 12 — Electricalc Lt
12 — electricalc lt voltage drop solutions the electricalc lt will calculate maxi- mum lengths, minimum wire sizes or actual voltage drops given the other two values. Voltage drop solutions are based on the dc resistance values found in nec chapter 9, table 8. Note: voltage drop solutions may vary s...
Page 15: User'S Guide — 13
User's guide — 13 [length] — length enters or calculates the maximum length of run for voltage drop computa- tion. Displays: feet or met [set] [length] — wire resistance displays the wire resistance per 1,000 feet of the wire size in [wiresz] based on nec chapter 9, table 8. Displays: ohms wire.
Page 16: 14 — Electricalc Lt
14 — electricalc lt ground function keys [grnd] — ground an output-only key used to find the grounding electrode conductor size for ac systems based on nec table 250-66 and an entered or calculated service-entrance conductor (largest size). Only actual wire sizes are consid- ered valid entries. ♦ fi...
Page 17: User'S Guide — 15
User's guide — 15 [set] [grnd] — equipment ground (eqgrnd) this function uses nec table 250-122 to compute the minimum equipment grounding conductor size, given an entered amperage rating or setting for a over-current device up line (i.E., 300 [set] [grnd]). Note: this function deviates from the nec...
Page 18: 16 — Electricalc Lt
16 — electricalc lt default settings when you first receive your calculator, it is pre-set to the default settings listed below. You can always return your cal- culator to these default values with an all-clear ([set] [x]). Ambient temperature 30°c insulation rating 60°c material copper (cu) phase 3...
Page 19: User'S Guide — 17
User's guide — 17 basic math operations this calculator uses standard chaining logic, which simply means that you enter your first value, the operator (+, –, x, ÷), the second value and then the equals sign (=). A. 3 [+] 2 [=] 5 b. 3 [–] 2 [=] 1 c. 3 [x] 2 [=] 6 d. 3 [÷] 2 [=] 1.5 percent calculatio...
Page 20: 18 — Electricalc Lt
18 — electricalc lt memory functions whenever the [m+] key is pressed, the displayed value will be added to mem- ory. Other memory functions: function keystrokes subtract from memory [set] [m+] recall total in memory [rcl] [m+] display & clear memory [rcl] [rcl] clear memory, no display [set] [rcl] ...
Page 21: User'S Guide — 19
User's guide — 19 kerchoff’s law the electricalc lt utilizes kerchoff’s law in finding volts, amps, volt-amps, watts, horsepower (theoretical), effi- ciency and power factor. Finding voltage find the voltage supply to a single- phase load drawing 14,605 volt-amps and 115 amps. Steps keystrokes displ...
Page 22: 20 — Electricalc Lt
20 — electricalc lt finding current load a building with 120/240 volt 1Ø service has the following loads: range = 7,800 va heating = 15,100 va dryer = 5,100 va fixed appliances = 8,900 va general lighting = 6,470 va what is the service load (amps) of the circuit supplying this building? Steps keystr...
Page 23: User'S Guide — 21
User's guide — 21 finding amps from kilowatts what is the amperage for a 75 kw load connected in a 120/208 volt, 3Ø circuit? Steps keystrokes display clear calculator [on/c] [on/c] 0. Set to 3-phase [set] 3 3 ph enter kilowatts 75 [kilo-] [watts] 75. Kw enter volts 208 [volts] 208. Volt solve for am...
Page 24: 22 — Electricalc Lt
22 — electricalc lt finding kva rating what is the kva rating for a 120/208 volt, three-phase 65 amp transformer? Steps keystrokes display reset calculator [set] [x] 0. Enter volts 208 [volts] 208. Volt enter amps 65 [amps] 65. Amps solve for kva [kilo-] [va] 23.417327 kva finding wattage a 120 volt...
Page 25: User'S Guide — 23
User's guide — 23 finding kw rating what’s the kw rating for a 90 amp, 208 volt, three-phase broiler with 100% power factor? Steps keystrokes display clear calculator [on/c] [on/c] 0. Set to 3-phase [set] 3 3 ph set power factor 100 [set] [watts] 100 pf% enter amps 90 [amps] 90. Amps enter volts 208...
Page 26: 24 — Electricalc Lt
24 — electricalc lt ampacity wire sizing the required wire size of a service con- ductor can be determined based on the specified electrical requirements and the [wiresz] key. The wire size is auto- matically recalculated whenever the wire insulation (temperature) ratings or wire material (copper or...
Page 27: User'S Guide — 25
User's guide — 25 re-sizing wire based on different insulation ratings what wire size is required for a 75°c copper branch circuit carrying a load of 260 amps? What would the wire size be if 90°c copper is used? Steps keystrokes display reset calculator [set] [x] 0. Set to 75°c [set] 7 3Ø 75 cu 0. E...
Page 28: 26 — Electricalc Lt
26 — electricalc lt wire sizing based on ambient temperature find the 90°c aluminum wire size needed to connect a 47,700 volt-amp load to a 240 volt, single-phase source. Steps keystrokes display clear calculator [on/c] [on/c] 0. Set to 1-phase [set] 1 1 ph set to 90°c [set] 9 1 Ø 90 cu 1 ph set to ...
Page 29: User'S Guide — 27
User's guide — 27 wire sizing based on material type find the wire size for a 75°c copper wire carrying a 3Ø load of 265 amps. What is the equivalent aluminum wire size? Steps keystrokes display reset calculator [set] [x] 0. Set to 75°c [set] 7 3Ø 75 cu 0. Enter amps 265 [amps] 265. Amps find wire s...
Page 30: 28 — Electricalc Lt
28 — electricalc lt sizing parallel conductors what size 60°c insulated copper wire is required for a single conductor carrying a 500 amp load in a free air environ- ment (30°c amb. Temp.)? What size for 2 parallel conductors? For 3 conduc- tors? Steps keystrokes display reset calculator [set] [x] 0...
Page 31: User'S Guide — 29
User's guide — 29 finding derated wire size what is the derated wire size required for nine 75°c copper wires, each carry- ing a maximum load of 65 amps? Steps keystrokes display reset calculator [set] [x] 0. Set to 75°c [set] 7 3Ø 75 cu 0. Enter amps 65 [amps] 65. Amps find normal wire size [wiresz...
Page 32: 30 — Electricalc Lt
30 — electricalc lt sizing temperature-adjusted derated wires a circuit was built with 90°c aluminum wire connecting a 47,650 volt-amp load to a 240 volt, single-phase source. Am- bient temperature is 50°c. What is the derated wire size required if eight cur- rent-carrying thhn wires were installed ...
Page 33: User'S Guide — 31
User's guide — 31 voltage drop the reduction in voltage between the power source and the load can be de- termined by entering the phase, volts, amps, wire material, voltage drop wire size and length of run. The calculator determines resistance and then the voltage reduction. Voltage drop can be disp...
Page 34: 32 — Electricalc Lt
32 — electricalc lt important note on voltage drop calculations the electricalc lt calculates voltage drop and wire size using dc resistance values as defined by the 1999 nec. To find the voltage drop for a specific wire size, you must first enter amps (and the other required variables), then enter ...
Page 35: User'S Guide — 33
User's guide — 33 steps keystrokes display enter wire size 8 [wiresz] 8 cu awg wire size solve volt. Drop [vd%] 3.0 drop v solve % v.Drop [vd%] 1.4 drop v % finding three-phase voltage drop a 20-amp three-phase load is being fed by a 230-volt source located 150 feet away. The installation specificat...
Page 36: 34 — Electricalc Lt
34 — electricalc lt finding voltage drop wire size a 20-amp single-phase 208-volt load will be located 175 feet away from the source. Assuming a 3% allowable volt- age drop, what is the size of 75°c con- ductor required for this branch circuit? Steps keystrokes display reset calculator [set] [x] 0. ...
Page 37: User'S Guide — 35
User's guide — 35 finding voltage drop distance how far from a single-phase 240-volt source can you install a 15 amp load using 60°c #10 al branch circuit con- ductors? Assume a 3% allowable volt- age drop. Steps keystrokes display reset calculator [set] [x] 0. Set to single ph. [set] 1 1 ph set to ...
Page 38: 36 — Electricalc Lt
36 — electricalc lt finding voltage drop resistance what is the resistance of 85 feet of #2 90°c copper conductor? Steps keystrokes display reset calculator [set] [x] 0. Set to 90°c mode [set] 9 3Ø 90 cu 0. Enter wire size 2 [wiresz] 2 cu awg wire size find resistance [set] [length] 0.2033993 ohms w...
Page 39: User'S Guide — 37
User's guide — 37 ground conductor wire size you can use single or multiple service entrance conductor(s) to find the grounding electrode conductor for ac systems. When using multiple conduc- tors, the electricalc lt uses the equivalent circular mils to find the grounding electrode conductor (based ...
Page 40: 38 — Electricalc Lt
38 — electricalc lt equipment grounding conductor wire size the [set] [grnd] keystroke can be used to find the grounding conductor size for raceways and “over-current devices in circuit ahead” equipment. The calculator uses the displayed amperage value to solve for the equipment grounding con- ducto...
Page 41: User'S Guide — 39
User's guide — 39 error codes the error codes for the electricalc lt are listed below (note: to clear an error, simply press any key): error description 1 display register overflow (answer too large to fit display) 2 invalid or out-of-scale entry 3 pf or eff calculated above 100% 5 unable to calcula...
Page 42: 40 — Electricalc Lt
40 — electricalc lt battery information the calculator is powered by a single 3- volt lithium cr-2032 battery. This should last upwards of 800 hours of actual use (1 year plus for most people). If the display becomes very dim or er- ratic, replace the battery. Note: please use caution when dis- posi...
Page 43: User'S Guide — 41
User's guide — 41 semi-permanent values the following semi-permanent values are cleared to default settings when the calculator is shut off: (1) independent user memory (2) free air mode warranty warranty repair service – u.S.A. Calculated industries, inc. ("cii") war- rants this product against def...
Page 44: 42 — Electricalc Lt
42 — electricalc lt cracking of the lcd, which are presumed to be damages resulting from misuse or abuse. To obtain warranty service in the u.S., ship the product postage paid to the cii authorized service provider listed on the back page of the user’s guide. Please provide an explanation of the ser...
Page 45: User'S Guide — 43
User's guide — 43 repair information and charges. Repairs are guaranteed for 90 days. Repair service – outside the u.S.A. Not all countries have cii authorized service providers or the same warranty and service policies. To obtain warranty or non-warranty repair service for goods purchased outside t...
Page 46: 44 — Electricalc Lt
44 — electricalc lt in no event will cii be liable for direct, indirect, special, incidental, or consequential damages resulting from any defect in the product or its documentation. The warranty, disclaimer, and remedies set forth above are exclusive and re- place all others, oral or written, ex- pr...
Page 47: User'S Guide — 45
User's guide — 45 legal notices software copyrighted and licensed to calculated industries, inc. By specialty calculator technologies, llc, 1999. User’s guide is copyrighted by calcu- lated industries, inc., 1999. Electricalc lt and calculated industries are registered trademarks of calculated indus...
Page 48
Designed in the united states of america printed in indonesia 5025-mn v1.0