A Coated Stranded Copper Conductors

B Polyester Insulation

C Extruded Semiconducting Layer

D Primary Insulation – Okoguard

E Extruded Insulation Shield

F Coated Copper Braid

G Jacket – Okoseal 

Applications
Okonite X-Ray cables are suitable for use on X-Ray apparatus for medical, industrial, research and control applications. They give trouble-free performance where pulse type high voltages are required. Although primarily used with medical diagnostic imaging equipment, Okonite X-Ray cables are also used with equipment in industrial applications as well as in research projects where high voltages, low power are required.

Okonite LOW NOISE X-Ray cables have specifically been designed for use where sensitive measurements are required. These LOW NOISE cables are manufactured and assurance tested to meet less than 10 picocoulumb discharge thereby reducing noise to a minimum.

Okonite LOW NOISE X-Ray cables are offered at 65kV, 75kV, 100kV, 230kV and 250kV dc ratings.

Typically, Okonite X-Ray cables are used to supply the anode and cathode voltages to the X-Ray tube. Since one terminal operates at a negative potential and the other at a positive potential, the voltage across the X-Ray tube is twice (2X) the rated voltage of the cable.

The two usual constructions are (1) three conductor (3/C) used on typical cathode cable installations, and (2) four conductor (4/C) utilized on installations with a grid controlled lead. Upon request, designs and constructions can be developed for special applications.

Product Features

• Low Noise - < 10 pC @ 200 Vac/mil of insulation to 42 kV max.
• Performance tested for long trouble-free service
• Small diameter.
• Flexible construction.>
• Excellent flexing endurance.
• Mechanically rugged.
• Easy to strip and terminate.
• Resistant to most oils and chemicals.
• Complies with NEMA Standard XR-7 where applicable.

Installation
The minimum bending radius for permanent installation or flexing in service is four times the cable diameter.

Specifications
Cable Core: Each Low Noise cable core contains two insulated filament conductor. In 65, 75, and 100kV cable filament conductors are #15 AWG (19x) [1.65mm²] tinned copper insulated with heat sealed color coded polyester tape. In 230kV cables, the filament wires are #16 AWG (19x) [1.31mm²] tinned copper. The 250 kV cable filaments are #14 AWG (19x) [2.08mm²] tinned copper. Both the 230 and 250kV filament wires are insulated with an extrusion of ETFE. Four conductor cables include one #20 AWG (7x) [0.52mm²] copperweld conductor per ASTM B-45 insulated with heat sealed polyester and shielded with metalized red polyester.

The tinned copper uninsulated conductor in 3/C 65, 75, 100 and 230kV cables is segmented into two #18 AWG [0.83mm²] flex stranded wires. The 4/C uninsulated conductor is segmented into three #18 AWG wires. A single #12 AWG (19x) wire is used in the 250kV cable.

Core Shield: An extruded layer of semiconducting compound encapsulates the composite core assembly.

High Voltage Insulation: Okonite’s premium EPR (ethylene-propylene rubber) insulation. This ozone resistant high voltage dielectric is extruded in tandem with the semiconducting layers which insures an intimate and contaminant free interface between the layers.

Insulation Shield: A strippable extruded layer of semiconducting EPR compound is applied directly over the insulation.

Shield: A braid of tinned copper wires is applied directly over the insulation shield. Minimum coverage indicated in table.

Jacket: A flexible Okoseal (specially compounded PVC) jacket is extruded over the shield to provide additional mechanical strength and resistance to most oils and chemicals.

65kV

3 Conductors
2-#15 Awg, insulated
1-(2-#18 Awg) uninsulated

504-22-6436

yes

Gray

0.465

11.81

0.605

15.36

219

33

243

36

75kV

3 Conductors
2-#15 Awg insulated
1-(2-#18 Awg) uninsulated

 504-22-3437
 504-22-3495

no
no

Gray

0.510
0.510

12.95
12.95

0.650
0.650 

16.50
16.50

247
258 

37
38 

279
297 

42
44

75kV

.

4 Conductors
2-#15 Awg 1-#20
Awg Copperweld,
insulated
1-(3-#18 Awg)
uninsulated

504-22-4464

no

Gray

0.570

14.48

0.715

18.20

296

44

335

50

75kV
Extra
Small
Diameter

3 Conductors
2-#15 Awg insulated
1-(2-#18 Awg)
uninsulated

504-22-3415

no

Gray

0.490

12.45

0.620

15.75

228

34

267

40

100kV

3 Conductors
2-#15 Awg insulated
1-(2-#18 Awg) uninsulated

504-22-3436
504-22-3463

no
yes

Gray

0.620

15.75

0.785

19.94

341

51

380

57

.100kV

4 Conductors
2-#15 Awg 1-#20
Awg Copperweld
insulated 1-(3-#18 Awg)
uninsulated

504-22-4436
504-22-4437

80
80

no
yes

Gray

0.660

16.76

0.845

21.46

391

58

446

66

230kV

3 Conductors
2-#16 Awg insulated
1-(2-#18 Awg) uninsulated

504-22-7410

no

Black

0.980
±.020

24.89
±.51

1.250
±.025

31.75
±.64

759

113

849

126

250kV

3 Conductors
2-#14 Awg insulated
1-(#12 Awg) uninsulated

504-22-9430

no

Black

1.280
±.020

32.51
±.51

1.505
±.025

38.23
±.64

1119

167

1250

186

Authorized Stock Item. Available from our Customer Service Centers.
(1) Cable is helically wrapped with a cellophane tape to maintain cleanliness during installation and includes a pull cord for ease of removal.

Designs for special applications upon request.

Electrical Characteristics

Rated Voltage
Rectified dc kV (2)

Number of
Conductors

Core to Shield
Capacitance ± 10%

4/C only: Copperweld grid lead capacitance = 70 pF/ft. (230 pF/m).

pF/ft.

pF/m

65
75 (ESD)
75
75
100
100
230
250

3
3
3
4
3
4
3
3

52
49.5
47
57
40
49
35
31

170
162
154
187
131
159
115
101

#16 AWG (1.31 mm2) tinned copper = 4.18 ohms/1000 ft (1.37 ohms/100 m)
#15 AWG (1.65 mm2) tinned copper = 3.51 ohms/1000 ft (1.15 ohms/100 m)
#18 AWG (0.83 mm2) tinned copper = 7.16 ohms/1000 ft (2.34 ohms/100 m)
2 X #18 AWG (0.83 mm2) tinned copper = 3.58 ohms/1000 ft (1.17 ohms/100 m)
3 X #18 AWG (0.83 mm2) tinned copper = 2.39 ohms/1000 ft (0.78 ohms/100 m)
#20 AWG (0.52 mm2) copperweld = 24.12 ohms/1000 ft (7.91 ohms/100 m)
#14 AWG (2.08 mm2) tinned copper = 2.73 ohms/1000 ft 0.895 ohms/100 m)
#12 AWG (3.31 mm2) tinned copper = 1.72 ohms/1000 ft (0.564 ohms/100 m)

(2) Voltage rating is between the conductor and the shielding braid.