RATING OF U.G GABLE



CONTINOUS CURRENT RATING OF UG GABLE  

IS: 692 1965 PILCAKKUMIMIUM CONDUCTOR CABLES L1 CLASS:

Nominal Area of Conductor
sq. mm

1.1 KV Cables

1.1 KV Cables

Current Rating in Amps

Current Rating in Amps

In air

In Ground

Induct

3 core belted type armoured

Twin Core

Multi Core

Twin Core

Multi Core

Twin Core

Multi Core

In air

in
ground

Induct

6

50

41

56

47

49

40

-

-

-

10

70

55

75

62

62

52

-

-

-

16

82

72

99

81

81

67

-

-

-

25

120

100

135

110

110

92

-

-

-

35

137

115

150

125

125

102

104

105

95

50

172

144

185

156

151

125

127

130

114

70

226

190

237

199

195

161

168

168

145

95

260

220

269

223

221

184

191

190

165

120

306

263

315

262

259

217

226

222

194

150

340

295

349

291

285

240

255

246

215

185

390

340

397

332

322

247

291

279

246

225

448

394

449

377

363

311

334

314

280

240

485

430

484

406

390

336

363

337

300

300

522

460

513

432

418

361

394

359

319

400

654

570

618

522

518

431

465

423

376

1. Maximum Conductor temperature

In air/in ground 80o C 1.1 KV 70o C for 11 KV

 

In duct 60oC for 1.1 KV 70oC for 11 KV

2. Depth of laying from group surface

Top surface of cable 460 mm for 1.1 KV 910 mm for 11 KV Top surface of duct - 760 mm

3. Ambient Temperature

Air - 25o C , Ground - 15o C

4. Thermal resistivity of soil

120oC cm/watt

MAINTENANCE SCHEDULE OF STORAGE BATTERIES

Sl.No.
(1)

Items of Maintenance
(2)

Periodicity result
(3)

Required satisfactory
(4)

1

Taking specific gravity and voltage of pilot cells of lead and Battery

Daily

1200 specific gravity Not less than 2 Volts/each cell

2

Checking specific gravity and voltage of each cell for lead-acid cell

Before and after charging or weeky Monthly

Do

3

Checking voltage of each coil for Nickle cadmium Cell

Monthly

Not less than 1.1 kV

4

Cleaning of terminals applying vasaline and topping up with distrilled water

Weekly

-

5

Overhaul of Nickle - Cadrnium battery

Yearly or as recommended by manufacturer

-

6

Leakage rest by lamp or volmeter method

Each shift

Indicator lamp should glow

7

Checking all connections of charges and battery for rightness

Quarterly

 

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