Nichrome Wire Calculator: Difference between revisions
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*Select convenient length | *Select convenient length | ||
*Select max temp - such as 550C = 1000F | *Select max temp - such as 550C = 1000F | ||
*Match gauge to proper voltage drop of 120V | *'''Match gauge to proper voltage drop of 120V''' - ie, observe parameters that produce 120V drop - those will be the working parameters since 120V is fixed. | ||
*Find out max gauge that is within current limits (15A) and has correct voltage | *Find out max gauge that is within current limits (15A) and has correct voltage | ||
*Limit for 15A outlet is 1800W | *Limit for 15A outlet is 1800W | ||
| Line 20: | Line 20: | ||
[[File:nichrome2.png]] | [[File:nichrome2.png]] | ||
=1000F Limit - 240V Case= | |||
[[File:1000c.png|300px]] | |||
=Examples= | =Examples= | ||
*12' of 26 ga draws 450 Watts | ==8" bed== | ||
*12' of 26 ga draws 450 Watts, but goes higher than rated 1000F | |||
*This was acceptable, but burns out thermistors if placed directly on heater. | *This was acceptable, but burns out thermistors if placed directly on heater. | ||
*Point: the shorter the nichrome, the hotter it will get while remaining at the correct voltage | |||
*'''Keep conservative on the bed power,then. Use 14' of 26 ga for 380W and 1000F max at 120V.''' | |||
*For same power density on large bed (7W/sq in), would need 4000W of heat. Can't do that. Limit is 1800W. the question is how best to achieve it - what length of nichrome is required for a workable length, while keeping temperature lower rather than higher. | |||
==2x2 foot bed== | |||
*1800W limit | |||
*To cover bed - try 6 lines separated by 4" of space. This means 12' + 2 feet return or 14' of sleeve | |||
*Gauge 17, 28' long, gets max 1090 and 1570 watts | |||
*sleeve it in 14' of sleeve. Quite doable. needs total of 28 feet of sleeve. | |||
*Selection: | |||
[[File:finalselection.png]] | |||
Shorten it by 2-4 feet to get max power and temperature. | |||
=Grades of Nichrome Wire= | |||
*60, 80, etc - https://temcoindustrial.com/product-guides/wire-cable-and-accessories/resistance-and-non-resistance-wire/nichrome-wire | |||
*Nichrome A or C - [https://super-metals.com/news/nichrome-a-and-nichrome-c-industrial-heating-wires/] | |||
=Links= | =Links= | ||
*[[Insulated Heatbed]] | |||
*[[120V Heatbed]] | *[[120V Heatbed]] | ||
Latest revision as of 07:09, 18 February 2021
- https://www.easycalculation.com/engineering/electrical/nichrome-wire-calculator.php
- Issue - above calculator does not fix voltage
Procedure
- Select convenient length
- Select max temp - such as 550C = 1000F
- Match gauge to proper voltage drop of 120V - ie, observe parameters that produce 120V drop - those will be the working parameters since 120V is fixed.
- Find out max gauge that is within current limits (15A) and has correct voltage
- Limit for 15A outlet is 1800W
Sample:
- Remains within 15 amps
- Shows correct voltage
- Max temp - select it to match voltage - you determine max possible temp and judge whether it will burn out your system if you have temperature sensitive components
- Note that Gauge 17 is the max fatness that stays within 1800W
- Note: 22' of 18 ga gets us right at 120V, and 1560W. Good. But temperature of 1260F is a little high.
1000F Limit - 240V Case
Error creating thumbnail: File missing
Examples
8" bed
- 12' of 26 ga draws 450 Watts, but goes higher than rated 1000F
- This was acceptable, but burns out thermistors if placed directly on heater.
- Point: the shorter the nichrome, the hotter it will get while remaining at the correct voltage
- Keep conservative on the bed power,then. Use 14' of 26 ga for 380W and 1000F max at 120V.
- For same power density on large bed (7W/sq in), would need 4000W of heat. Can't do that. Limit is 1800W. the question is how best to achieve it - what length of nichrome is required for a workable length, while keeping temperature lower rather than higher.
2x2 foot bed
- 1800W limit
- To cover bed - try 6 lines separated by 4" of space. This means 12' + 2 feet return or 14' of sleeve
- Gauge 17, 28' long, gets max 1090 and 1570 watts
- sleeve it in 14' of sleeve. Quite doable. needs total of 28 feet of sleeve.
- Selection:
Shorten it by 2-4 feet to get max power and temperature.
Grades of Nichrome Wire
- 60, 80, etc - https://temcoindustrial.com/product-guides/wire-cable-and-accessories/resistance-and-non-resistance-wire/nichrome-wire
- Nichrome A or C - [1]