Technical Info

Technical Info

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	Conductor Information
	Coax Formulae
	Dielectric Information

Annealed Copper Conductors - Nickel Plated (NPC), Silver Plated (SPC), and Tin Plated (TPC)
AWG Size	Conductor area (Circular Mils)		K-Value	Stranding (# if Strands x Strand AWG)	Nominal Dia. of Individuals Strands	Diameter of Stranded Conductor					Max. Resistance @ 20°C (Ω / 1000 feet)
						Minimum	Maximum
							Small Diameter		General Purpose
	Nominal	Minimum					SPC	NPC & TPC	SPC	NPC & TPC	SPC	NPC	TPC
30	112	102	.770	7x38	.0040	.0105	.0124	.0134	.0124	.0134	100.7	110.7	108.4
28	175	161	1.05	7x36	.0050	.0135	.0154	.0164	.0154	.0164	63.8	67.9	68.6
26	304	275	1.34	19x38	.0040	.0175	.0194	.0204	.0204	.0214	38.4	42.2	41.3
24	475	434	1.18	19x36	.0050	.0225	.0244	.02744	.0254	.0264	24.3	25.9	26.2
22	754	694	1.87	19x34	.0063	.0285	.0304	.0314	.0324	.0334	15.1	16.0	16.2
20	1,216	1127	1.34	19x32	.0080	.0365	.0384	.0394	.0404	.0414	9.19	9.77	9.88
18	1,900	1770	1.34	19x30	.0100	.0455	.0484	.0494	.0504	.0514	5.79	6.10	6.23
16	2,426	2261	1.19	19x29	.0113	.0515	.0544	.0554	.0574	.0584	4.52	4.76	4.81
14	3,831	3570	1.38	19x27	.0142	.0645	.0684	.0694	.0724	.0734	2.88	3.00	3.06
12	6,038	5672	1.67	19x25	.0179	.0815	.0854	.0864	.0904	.0924	1.81	1.89	1.92
12	5,874	5473	1.26	37x28	.0126	.0835	.0874	.0894	.0894	.0904	1.90	1.98	2.02
10	9,354	8716	1.35	37x26	.0159	.1060	.1100	.1120	.1120	.1140	1.19	1.24	1.26
8	16,983	16645	2.29	133x29	.0113	.1580	.1660	.1690	.1690	.1730	.658	.694	.701
6	26,818	26284	2.31	133x27	.0142	.1980	.2080	.2120	.2130	.2170	.418	.436	.445
4	42,615	41767	2.55	133x25	.0179	.2500	.2630	.2680	.2680	.2740	.264	.275	.280
2	66,500	64981	3.21	665x30	.0100	.3200			.3400	.3400	.170	.177	.183
1	81,700	79878	2.89	817x30	.0100	.3660			.3800	.3800	.139	.144	.149
1/0	104,500	102126	3.24	1,045x30	.0100	.3950			.4250	.4250	.108	.113	.116
2/0	133,000	130059	3.15	1,330x30	.0100	.4400			.4750	.4750	.085	.089	.091
3/0	166,500	162795	3.09	1,665x30	.0100	.5000			.5400	.5400	.068	.071	.071
4/0	210,900	206,213	3.32	2,109x30	.0100	.5650			.6050	.6050	.054	.056	.056

Allowable number of missing strands: AWG 30-4:0; AWG 2-1:2; AWG 1/0-2/0:3; AWG 3/0:4; AWG 4/0:5.

Elongation, % min: AWG 30-24:6; AWG 22-4/0:10.

Nominal values are for information only, and are not requirements. Dimensions in inches.

High-Strength Copper Alloy Conductors-Nickel Plated (NPA) and Silver Plated (SPA)
AWG Size	Conductor area (Circular Mils)		K-Value	Stranding (# if Strands x Strand AWG)	Nominal Dia. of Individuals Strands	Diameter of Stranded Conductor					Minimum Break Strength (pounds)	Max. Resistance @ 20°C (Ω / 1000 feet)
						Minimum	Maximum
							Small Diameter		General Purpose
	Nominal	Minimum					SPA	NPA	SPA	NPA		SPA	NPA
30		102	.770	7x38	.0040	.0105	.0124	.0134	.0124	.0134	117.4	129.6	5.20
28	175	161	1.05	7x36	.0050	.0135	.0154	.0164	.0154	.0164	74.4	79.0	8.20
26	304	275	1.34	19x38	.0040	.0175	.0204	.0204	.0204	.0214	44.8	49.4	14.2
24	475	434	1.18	19x36	.0050	.0225	.0244	.0254	.0254	.0264	28.4	30.1	22.4
22	754	694	1.87	19x34	.0063	.0285	.0314	.0314	.0324	.0334	17.5	18.6	35.8
20	1,216	1,127	1.34	19x32	.0080	.0365	.0395	.0404	.0404	.0414	10.7	11.4	58.1
18	1,900	1,770	1.34	19x30	.0100	.0465	.0467	.0467	.0504	.0514	6.43	6.79	90.3
16	2,426	2,261	1.19	19x29	.0113	.0515	.0530	.0530	.0574	.0584	4.90	5.16	115

Allowable number of missing strands: All sizes: 0 • Elongation, % min: All sizes: 6.

Nominal values are for information only and are not requirements. Dimensions in inches.

27 Percent Nickel-Coated Conductors - Copper (NHC) and High-Strength Copper Alloy (NHA)
AWG Size	Conductor area (Circular mils)		K-Value	Stranding (# of Strands x Strand AWG)	Nominal Dia. of Individual Strands	Diameter of Stranded Conductor		Max. Resistance @ 20°C (Ω / 1000 feet)
AWG Size	Nominal	Minimum	K-Value	Stranding (# of Strands x Strand AWG)	Nominal Dia. of Individual Strands	Minimum	Maximum	NHC	NHA
22	754	694	1.87	19x34	.0063	.0290	.0330	23.7	25.6
20	1,216	1,127	1.34	19x32	.0080	.0365	.0415	14.6	15.3
18	1,900	1,770	1.34	19x30	.0100	.0455	.0520	9.14	9.59
16	2,426	2,261	1.19	19x29	.0113	.052	.061	6.85	7.30
14	3,831	3,570	1.38	19x27	.0142	.065	.074	4.32
12	6,038	5,672	1.67	19x25	.0179	.082	.094	2.78
10	9,880	8,716	1.35	49x27	.0142	.123	.129	1.68
8	16,983	16,645	2.29	133x29	.0113	.158	.179	.936
6	26,818	26,284	2.31	133x27	.0142	.198	.218	.591
4	42,615	41,767	2.55	133x25	.0179	.250	.272	.375
2	66,500	64,981	3.21	665x30	.0100	.320	.345	.241
1	81,700	79,878	2.89	817x30	.0100	.355	.384	.196
1/0	104,500	102,126	3.24	1,045x30	.0100	.395	.432	.153
2/0	133,000	130,059	3.15	1,330x30	.0100	.440	.490	.120
3/0	166,500	162,795	3.09	1,665x30	.0100	.500	.548	.096
4/0	210,900	206,213	3.32	2,109x30	.0100	.565	.615	.077

Allowable number of missing strands: AWG 22-4:0; AWG 2-1:2; AWG 1/0-2/0:3; AWG 3/0:4; AWG 4/0:5.

Elongation, % min: NHA, AWG 22-16:6; NHC, all sizes: 10.

Nominal values are for information only, and are not requirements. Dimensions in inches.

Type KPH, KPS, KNH, and KNS Thermocouple Conductors
AWG Size	Conductor area (Circular Mils)		Stranding (# of Strands x Strand AWG)	Nominal Dia.of Individual Strands	Diameter of Stranded Conductor		Max. Resistance @ 20°C (Ω / 1000 feet)
	Conductor area (Circular Mils)				Diameter of Stranded Conductor		KPH		KPS
	Nominal	Minimum			Minimum	Maximum	Min.	Max.	Min.	Max.
22	754	694	19x34	.0063	.029	.033	546.7	604.3	228.2	252.3
20	1.216	1,127	19x32	.0080	.037	.041	339.2	375.0	141.5	156.5
18	1,900	1,770	19x30	.0100	.046	.051	217.0	240.0	90.5	100.2
16	2,426	2,261	19x29	.0113	.052	.058	169.7	187.7	70.6	78.2
14	3.831	3,570	19x27	.0142	.065	.073	107.6	119.0	44.9	49.7

Allowable number of missing strands: All sized: 0.

Nominal values are for information only, and are not requirements. Dimensions in inches.

Characteristic Impedance: Coaxial cables are typically 50Ω, 75Ω, or 95 Ω impedance. Cables with 50Ω impedance are the most common, because they offer the best balance between maximum power transmission and minimum loss. Where minimum attenuation is the most important consideration, such as in CATV systems, 75Ω cable is more widely used.

Attenuation: Losses occur in coaxial cables both from conductor loss and dieletric inefficiency. PTFE has become the most commonly used dielectric in MIL-C-17 and other coaxial cables because it combines a low dielectric constant with good mechanical stability through a wide temperature and frequency range.

VSWR (Voltage-Standing Wave Ratio): VSWR is one of the most important characteristics of a coaxial cable because it is the measure of the cable’s overall efficiency in transmitting a signal at a given frequency. It is expressed as the ratio of the cable’s mismatch to a perfect match, i.e. 1.25:1. Advanced, consistent cable manufacturing techniques minimize not only the overall VSWR, but can also minimize or eliminate VSWR spikes at specific frequencies.

Cutoff Frequency: The cutoff frequency of a coaxial cable is the frequency at which it no longer transmits its TEM (Transverse Electromagnetic Mode) signal.

Coaxial Cable Formulae

Dielectric Constants
Air.................	1.0	Foamed FEP ........	1.5-2.0	Polyimide............	3.0-3.5	PVC...............	4.5-5.8
E Glass ............	6.0	Mica Glass..........	1.2-3.0	Polyimide/FEP film..	2.2-2.3	PVF...............	3.0-8.4
ETFE...............	2.6	Nylon...............	4.5	Polypropylene........	2.3	Silicone Rubber...	2.1-3.5
Expanded PTFE..	1.4-2.0	PFA................	2.0	Polysulfone...........	3.1	Urethanes..........	6.7-7.5
FEB................	2.0	Polyethylene........	2.3	PTFE.................	2.0

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