Page 277 - Electrician -1st Year - TT

Þ¬í‚èŠð†´œ÷î£, (Fig 3a) úTv è‹H 裆®»œ÷õ£Á ªñ‚èo º¬ù»ì¡
Ñ®hfûN 膴Šð´ˆ¶Aøî£ â¡ð¬î Þ¬í‚辋. ÞŠªð£¿¶ ªñ‚èK¡
ÜPò «ê£î¬ù ªêŒòŠð´Aø¶. ñŸªø£¼ ¹øˆF™ Þ¼‚°‹. è‹HJ¬ù â´ˆ¶
î¬ó»ì¡ ެ툶 ªñ‚è¬ó ÜKò
«õèˆF™ ²öŸø¾‹. Þšõ£Á ªðøŠð†ì
Ü÷i´èœ W›è‡ì º¬øJ™ ªðøŠð´‹
ñFŠ¹‚° ªL °¬øõ£è Þ¼‚Ld áPôÕ.
º¬ø 1 (Method 1): B.I.S.¡ ð® îóñ£ù
ñFŠ¹ (Standard value as per B.I.S.):

CuÑúX`u I¡î¬ìJ¡ ñFŠ¹

= = No.of points 50 in the circuit Mega ohms

Þƒ° Ñ®hf, úXml úaôpPo ñŸÁ‹
NôdùLh ºîLò¬õ îQˆîQŠ ¹œOè÷£è
â´ˆ¶‚ ªè£œ÷Šð†ìù.

å¼ «õ¬÷ è‹H ܬñŠð£ù¶ HMC
– Þ„«ê£î¬ù‚°, å¼ Gò£¡ ªìvìûW 裊HìŠð†ì èìˆFèO™ ªêŒòŠ
(Fig 3b) þp Lôi©jÕs[T¥ NôdùLh¥u ð†®¼‰î£™ èí‚A´‹ «ð£¶ 50 ðFô£è
YXÕ TdL Õû[«p ÖûZjÕ Ñ®hfûN 12.5 â¡Á ¬õˆ¶‚ ªè£œ÷ «õ‡´‹.
Bu ùNnV úYiÓm. M÷‚° âK‰¶‹
ÝçŠ ªêŒ»‹ «ð£¶ M÷‚° âKò£ñ½‹
Þ¼‰î£™ ܶ êKò£ù ùTôXô¬h¥¬ò
°P‚°‹. Þ„«ê£î¬ù ð¬öò Ü™ô¶
¹Fò I¡è‹H G˜ñ£ùƒèO™
ð£¶è£Š©Ÿè£è è†ì£ò‹ ªêŒòŠðì
«õ‡´‹.

I¡è‹H G˜ñ£ùƒèO™ CuÑúX`u
«ê£î¬ùèœ (Insulation tests in wiring
installation)
Þ.ï.G. (B.I.S.) 732 (ð°F 2) - 1982 T¥ H¡õ¼‹
ðK«ê£î¬ùèœ ªêŒò «õ‡´‹.
èìˆFèœ ñŸÁ‹ GôˆFŸ° Þ¬ì«òò£ù
CuÑúX`u I¡î¬ì (Insulation resistance º¬ø 2 (Method 2): I¡ G˜ñ£ùˆF¡ «ð£¶
between conductors and earth): Þ‰î «ê£î¬ù‚° ãŸð´‹ I¡èCõ£ù¶ ØÝ TÞ
ùU«u Ñ®hfûN ÝŠ ªêŒ¶ @lëû^ ªuú]ôhPj§tÏ 1/5000 ð°F‚°œ
â´ˆ¶Mì «õ‡´‹. I¡ ðA˜ñ£ù Þ¼‚è «õ‡´‹. â¡Á I.E. MFèœ
ðô¬èJ™ àœ÷ @lëû^ 'IN' ¨ûX«Ûm ÃÁA¡øù.
â™ô£ M÷‚°èœ ‘I¡ MCP蜒 ÞõŸPŸè£ù Þ¬îŠ ðò¡ð´ˆF 裊d†´ I¡î¬ì»ì¡
Ñ®hfèœ 'IN' ¨ûX«p Þ¼‚è «õ‡´‹. ñFŠ¹
â™ô£ I¡ è¼Mè¬÷»‹ ñŸÁ‹
ÜõŸPŸ°‡ì£ù I¡ àðèóíƒè¬÷»‹ = Supply voltage in volts ohms
Leakage
current

I¡ Þ¬íŠHL¼‰¶ ¶‡®ˆ¶ Mì Supply voltage in volts x 5000
«õ‡´‹. = Full load current of the insatallat ion
NôdùLh¥u úTv ñŸÁ‹ ¨ëhWp
Where leakage current
èìˆFèû[ _mTo JVo ùLôiÓ ÏßdÏ
Ñtß EiPôdLÜm. úTv Utßm ¨ëhWp Full= load current of the installati on x 1
Øû]Lû[ ùU«u Ñ®hf Eì¡ «ê˜ˆ¶ 5000
Þ¬í‚辋. «ñ½‹, èìˆFûV Fig 4-™

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