Cat 5 Ampacity: Difference between revisions
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*Cat6, 23 gauge, 19 cents per foot, 300v rating. [https://m.platt.com/platt-electric-supply/Category-Cables-CAT-6-Non-Plenum/Hitachi-Cable-America-Inc/30238-8-WH2/Products.aspx?pid=925720] | *Cat6, 23 gauge, 19 cents per foot, 300v rating. [https://m.platt.com/platt-electric-supply/Category-Cables-CAT-6-Non-Plenum/Hitachi-Cable-America-Inc/30238-8-WH2/Products.aspx?pid=925720] | ||
*22 ga - [https://www.cablinginstall.com/cable/article/16471853/22awg-category-5e-cable-for-power-over-ethernet-applications] exists | |||
*Sourcing - 1000 feet for $200 - [https://www.discount-low-voltage.com/Cable/High-Powered-100w-PoE-22awg-cat5e-cable/PW52-H72-E5?gclid=EAIaIQobChMIpuzqutzd4wIVkICfCh3LIwDmEAQYASABEgJV6PD_BwE] | |||
*12 pair 22 awg exists, but is 10x more expensive than 4 pair - [https://www.solidsignal.com/pview.asp?p=7840a0601000], so 3x more expensive for the same service. |
Revision as of 04:27, 1 August 2019
http://www.sumidacrossing.org/LayoutElectricity/MRRWire/WireAmpacity/ - says AWG 24 carries 3.5A open and 2A enclosed.
From Stefan H
Under the following assumptions up to 3A should be fine.
- 26AWG cat5/6 cable
- using two leads
- cable is relatively short
- normal ambient temps
- stepper control (at most use 75% of configured drive current)
Also: https://en.wikipedia.org/wiki/American_wire_gauge
Charts
- This chart suggests about 1.8A for 8 core wire 23 AWG- [1]. Useful chart in terms of differentiating between the number of cores, but does not consider free air vs enclosed
- 23 AWG, .7A - [2].Why the 100% difference betweeen different charts?
- This chart shows free air and derating for bundles, which most approximates open air Cat 5 (8 bundle) - here 23 AWG is 7A*.7 = 5A
Notes
Change on CEB controller: using RJ45 for power-over-cat5. That is a great standard for easy connection, as 8 leads are rated for a total of 16 amps enclosed, and 28 Amps open. So a good product ecology standard for all electrical signal/power transmission in CNC and controls applications. The relevance is the cost and easy connection in prototyping.
We could potentially even consider power over cat 5 for scalable power supplies - such as 8 cat 5 wires get you to a 200A welder - which would be the first use I hear of power electronics over cat 5. I think it's worthwhile because cat 5 is ubiquitously available. Phone burial feeder cable can also be used with Cat 5 ends, no?cc
From Oliver
"Each pair of twisted pairs will need to handle a current of up to 600 mA (Type 3) or 960 mA (Type 4)."
Thats what a pair can handle (in the new upcoming 4PPoE standard), means per wire about 300 mA to 480 mA.