Cat 5 Ampacity: Difference between revisions
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=Introduction= | |||
Ethernet cable is a common type of cable - it is CAT 5 or 6 cable. It typically comes in 4 pairs, but is also available in 12 or more. | |||
http://www.sumidacrossing.org/LayoutElectricity/MRRWire/WireAmpacity/ - says AWG 24 carries 3.5A open and 2A enclosed. | http://www.sumidacrossing.org/LayoutElectricity/MRRWire/WireAmpacity/ - says AWG 24 carries 3.5A open and 2A enclosed. | ||
| Line 6: | Line 9: | ||
Under the following assumptions up to 3A should be fine. | 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- [http://www.engineeringtoolbox.com/wire-gauges-d_419.html]. Useful chart in terms of differentiating between the number of cores, but does not consider free air vs enclosed | |||
*23 AWG, .7A - [http://diyaudioprojects.com/Technical/American-Wire-Gauge/].'''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= | |||
*https://en.wikipedia.org/wiki/Power_over_Ethernet#Standards_development | |||
"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. | |||
=Sourcing= | =Sourcing= | ||
*'''8 conductor, stranded, 22 ga''' - [https://smile.amazon.com/gp/product/B06ZY2B9XJ/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1#customerReviews] | |||
*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 solid 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. | |||
*22 ga 8 conductor unshielded cable - [https://www.pacergroup.net/unshielded-multi-conductor-cable-22-awg/?sku=M22/6&gclid=EAIaIQobChMIgbXM0-3g4wIVhp-fCh388AHeEAQYAiABEgKYf_D_BwE] | |||
*Belden stranded - 24 cents/foot - [https://www.discount-low-voltage.com/Cable/22-Gauge/BE-5506UE?gclid=EAIaIQobChMIgbXM0-3g4wIVhp-fCh388AHeEAQYAyABEgJx6_D_BwE] | |||
*100 feet stranded shielded 8 conductor - $38 - [https://www.amazon.com/Custom-Cable-Connection-Conductor-Stranded/dp/B06ZY2B9XJ] | |||
*16 cents per foot, unshielded - 22-8C CMP Plenum - [https://www.wireandcableyourway.com/22-8c-cmp-plenum-security-cable-stranded-unshielded.html] | |||
==Higher Pairs== | |||
*12 pair, 24 ga, CAT 3 solid - [https://www.showmecables.com/12-pair-cat3-cable-plenum-per-ft?gclid=EAIaIQobChMIgIiSk_mZ5AIVUL7ACh1vvw_8EAQYAyABEgIpYfD_BwE] - 73 cents/foot | |||
*25 pair, 25 ga, CAT 3 solid - $1.29 - [https://www.platt.com/platt-electric-supply/Outside-Plant-Cables-Direct-Burial-OSP-Telephone-Cable/Superior-Essex/09-097-02/product.aspx?zpid=236869] | |||
=Links= | |||
*[[Cat 5 Cable]] | |||
*[[Direct Burial Cat 6]] | |||
*[[Cat 6 Direct Burial Shielded Cable]] | |||
Latest revision as of 21:46, 23 August 2019
Introduction
Ethernet cable is a common type of cable - it is CAT 5 or 6 cable. It typically comes in 4 pairs, but is also available in 12 or more.
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.
Sourcing
- 8 conductor, stranded, 22 ga - [3]
- Cat6, 23 gauge, 19 cents per foot, 300v rating. [4]
- 22 ga - [5] exists
- Sourcing - 1000 feet for $200 - [6]
- 12 pair 22 awg solid exists, but is 10x more expensive than 4 pair - [7], so 3x more expensive for the same service.
- 22 ga 8 conductor unshielded cable - [8]
- Belden stranded - 24 cents/foot - [9]
- 100 feet stranded shielded 8 conductor - $38 - [10]
- 16 cents per foot, unshielded - 22-8C CMP Plenum - [11]