Question about Texas Instruments TI-84 Plus Calculator

# How to calculate cable size

I need a calculator for cable size or an formula to calculate cable sizeing single & 3 phase

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This site may help. Plug in all the information about your load requirements and it will figure out wire and breaker size and even how big a conduit you'd need for the run.

Posted on Jun 02, 2009

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
Goodluck!

Posted on Jan 02, 2017

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Here is to get you started. To increase the size of the image do a CTRL Plus (+) in your browser.
You need to calculate the slant height of the pyramid for the formula of the lateral area. You should find a value of (1/2)*SQRT(203) or about 7.1239 cm

You need to calculate the altitude (height) of the pyramid from the apex (summit) to the center of the base triangle (center of inscribed circle, barycenter, orthocenter). The hypotenuse of such triangle is the slant height. One leg is the altitude (to be found), the measure of the second leg is (1/3) the altitude of the equilateral triangle that forms the base. You should find (1/3) m MH= (1/3)* (11/2)*SQRT(3)

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### I need to produce a diagram of a typical wiring system for a small factory showing the arrangment from the incomeing service cable to a 3-phase motor, with seperate distribution to lighting and other...

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### For an 3 Tn unit- single phase- 220 V a.c and gfor

There should be a full load amps or rated load amps on each of these units on the rating or nameplate. The ampacity or fuse size and wire size, which I think that's what you are wanting to know . The fuse size would be full or rated load amps times 125% and the wire size depending on the length of the run, 50 feet or less, (15 amps 14 gauge wire), (20 amps 12 gauge), (30 amps 10 gauge), and (40 amps 8 gauge).

Aug 11, 2009 | Heating & Cooling

### What size duct do I need

there are online formula to calculate what you want
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I would consider from large shop air circulation systems (as you see in Aldi, woolworths , sears etc ) that a staged diameter difference from motor to exhaust point be considered as that will keep a steady air flow for the length of the tube and a hp rating of 3hp 3 phase as a minimum
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### MUH108

4awg is about the size of battery jumper cable. or 240v multi-strend cable. and 48A is big. double 40A brakers.
the heater is 208v 3-phase 34,000BTU
it is call out to use the 240 comercial wiring.

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Here are a few ways to calculate your BTU's.
Get ready to use that algebra you thought you'd never use.
1 Ton = 12000 BTU's
400cubic feet per minute (CFM) = 1 Ton on standard ac units (300 is an absolute minnimum)
BTU's air heat = difference in temp. ( ∆T ) x 1.08 x CFM
∆T = BTU's / (1.08 x CFM)
i.e. 65F entering your unit and 93F air leaving on a 12000BTU unit.
∆T = 28
CFM = 400
28 x 1.08 x 400 = 12096BTU's
Another way...
Electric heat calculations.
BTU's = KW (killowatts) x 3413
Watts = Volts x Amps (single Phase) Most Homes))
Watts = Volts x Amps x Phase (this is for three phase units.)three wires and a ground))
120 volts 30 amps single phase (common)
120 x 30.0 x 1 = 3600 or 3.6KW 3.6 x 3413 = 12286BTU's

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