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ODISHA POWER GENERATION CORPORATION LIMITED BANHARPALI, JHARSUGUDA ODISHA – 768234 ODISHA – 768234 INDIA IB THERMAL POWER STATION 2 × 660 MW UNITS 3 & 4 Reference: BGR Letter Ref. No. GID/0208-T/00149 Dated 20-11-2013 Reference: Letter No. OPGC/BOP/0048/16-01-2014 Date: 16-01-2014 Subject: Comments on GENERAL NOTES ON EARTHING & LIGHTNING PROTECTION SYSTEM Comment Resolution Sheet: 1 SL. No. OPGCL / DCPL Comments Date: 16-01-2014 BGR Replies / Resolution Date: 31-01-14 OPGCL / DCPL Comments Date: 05-03-14 Document Number: GID-208-EL-BAW-SA-2043- R0 1. 75 X 10 mm Earthing flat shall be provided for 400kV and EHV equipment, 415V PCC,MCC,DB’s etc Please refer to tender document by M/S DCPL “GROUNDING NOTES & DETAILS” – K8B09-DWG-E-600 – Sheet 03 of 26 where the earth flat sizes for 400kV and EHV equipment,415 V PCC,MCC,DBS etc. are mentioned as 50X6 mm GS flat. The 50X6 mm GS flat is the adequate size for earthing 400kV and EHV equipment, 415V PCC,MCC,DB’s . Please convey your As per Contract Specification V-II-F1/S- IX, 75 X 10 mm Earthing flat shall be provided for 400kV and EHV equipments. BGR may note that as per CL.No.1.00.00 of V-IIA/S-I/Page2 “In the event of conflict between requirements of any two clauses of the specification the more stringent requirement as per interpretation of the Buyer shall DEVELOPMENT CONSULTANTS PRIVATE LIMITED DEVELOPMENT CONSULTANTS HOUSE BLOCK-DG/4, SECTOR-II, SALT LAKE, KOLKATA – 700 091 Page 1 of 7

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ODISHA POWER GENERATION CORPORATION LIMITEDBANHARPALI, JHARSUGUDA ODISHA 768234ODISHA 768234 INDIA IB THERMAL POWER STATION 2 660 MW UNITS 3 & 4Reference BGR Le!!er Ref" N#" GID$020%&T$00'4(D)!e* 20&''&20'3Reference Le!!er N#" OPGC$BOP$004%$'6&0'&20'4D)!e '6&0'&20'4S+,-ec! C#..en!/ #n GENERAL NOTES ON EARTHING & LIGHTNING PROTECTION S0STEM C#..en! Re/#1+!2#n S3ee! 'SL"N#"OPGCL $ DCPL C#..en!/Date: 16-01-2014BGR Re412e/ $ Re/#1+!2#nDate: 31-01-14OPGCL $ DCPL C#..en!/Date: 05-03-14D#c+.en! N+.,er GID&20%&EL&BAW&SA&2043& R0175 ! 10 "" #a$t%&'( )at *%a++ ,e -$./&0e01.$ 40023 a'0 #H3e45&-"e't, 4153 P66,766,DB8*et9P+ea*e $e1e$ t. te'0e$ 0.95"e't ,: 7;S D6PL D#=AILS? @8B0A-DBG-#-600 S%eet 03 .1 26 C%e$e t%e ea$t% )at *&De* 1.$ 40023 a'0 #H3 e45&-"e't,415 3 P66,766,DBS et9 a$e "e't&.'e0 a* 50!6 "" GS )at =%e 50!6 "" GS )at &* t%e a0e45ate *&De 1.$ ea$t%&'( 40023 a'0 #H3 e45&-"e't, 4153 P66,766,DB8*P+ea*e 9.'/e: :.5$ a99e-ta'9eA* -e$ 6.'t$a9t S-e9&E9at&.' 3-II-F1;S-I!, 75 !10 "" #a$t%&'( )at *%a++ ,e -$./&0e0 1.$ 40023a'0 #H3 e45&-"e't* BGR "a: '.te t%at a* -e$6LN.10000 .1 3-IIA;S-I;Pa(e2 ,&&I N.te0 > &'9.$-.$ate0N.te0 a'0 a99e-te0Page 2 of 6 Comments Resolution Sheet: Continued.SL"N#"OPGCL $ DCPL C#..en!/Date: 16-01-2014BGR Re412e/ $ Re/#1+!2#nDate: 31-01-14OPGCL $ DCPL C#..en!/Date: 05-03-14 5=%e *%&e+0 C&$e, C%&9% *%a++ ,e,$.5(%t 0.C' t. t%e ,.tt." .1t%e *tee+ t.Ce$*, *%a++ ,e9.''e9te0 t. t%e ea$t%&'(9.'059t.$ J75!10 ""(a+/a'&De0 7S )atI, C%&9% &'t5$'*%a++ ,e9.''e9te0t.t%e$&*e$ 1$."t%e"a&'($.5'0&'("at ; ($&0=%e 0.C' 9.'059t.$ *&De "e't&.'e0 &' t%e te9%'&9a+ *-e9&E9at&.' D.9 N. @8B0A-BOP-SP6-G-001 - 3-II-F2;S-3II;A''G-B : -a(e - 32 &*50 ! 6 "" C%&9% &* t%e a0e45ate *&De 7.$e./e$, t%e a$ea .1 t%e a,./e 9.'059t.$ &* "59% %&(%e$ t%a' t%e a$ea .1 *%&e+0 C&$e J7;AI "e't&.'e0 &' t%e *-e9&E9at&.' 9+a5*e N. 3-II-F1-;S-I!:5, 30402 P+ea*e 9.'/e: :.5$ a99e-ta'9eA* -e$ 9+a5*e '. 30603 a'0 30703 .1 9.'t$a9t *-e9&E9at&.' 3-II-F1-;S-I! , t%e 0.C' 9.'059t.$* 1.$ t%e *%&e+0 C&$e *%a++ ,e 75!10 "" GI )at6R&*e$ 1$."#+e9t$.0e; G$.5'0"at #+e9t$.0e 1.$ L&(%t'&'(P$.te9t&.' *%a++ ,e $e/&*e0a*40 "" 0&a $.0 P+ea*e $e1e$ t. te'0e$ 0.95"e't ,: 7;SD6PL D#=AILS? @8B0A-DBG-#-1000 S%eet 03 .1 12 C%e$e t%e R&*e$ 1$." #+e9t$.0e; G$.5'0 "at 1.$ L&(%t'&'( P$.te9t&.' a$e "e't&.'e0 a* 32 "" 0&a 7S $.0 He'9e 32"" 0&a 7S $.0 %a* ,ee' *%.C' P+ea*e 9.'/e: :.5$ a99e-ta'9eA* -e$ 9.'t$a9t *-e9&E9at&.' 3-II-F2-;S-3II$&*e$1$." #+e9t$.0e; G$.5'0 "at#+e9t$.0e 1.$ L&(%t'&'( P$.te9t&.' *%a++ ,e $e/&*e0 a* 40 ""0&a $.0 7;S BGR "a: '.te t%at a* -e$ 6LN.10000 .1 3-IIA;S-I;Pa(e2 ($.5'0&'( .1 GI *%&e+0 C&$e $&*e$ *%a++ ,e 40 "" 0&a 7S $.0P+ea*e $e1e$ t. te'0e$ 0.95"e't ,: 7;S D6PL D#=AILS? - @8B0ADBG#1000 S%10 .1 12 C%e$e t%e *t$&'(&'( a$$a'(e"e't > ($.5'0&'( .1 .1 GI *%&e+0 C&$e $&*e$ %a* ,ee' "e't&.'e0 a* 32 "" 0&a 7S $.0 He'9e 32"" 0&a 7S $.0 %a* ,ee' *%.C' P+ea*e 9.'/e: :.5$ a99e-ta'9eA* -e$ 9.'t$a9t *-e9&E9at&.' 3-II-F2-;S-3II$&*e$1$." #+e9t$.0e; G$.5'0 "at#+e9t$.0e 1.$ L&(%t'&'( P$.te9t&.' *%a++ ,e $e/&*e0 a* 40 ""0&a $.0 7;S BGR "a: '.te t%at a* -e$ 6LN.10000 .1 3-IIA;S-I;Pa(e2