PROVISION OF HT RING MAIN POWER SUPPLY AND ALLIED WORKS IN VARIOUS SUB STN UNDER GE AVADI.

Amount

BOQ UPLOADED ON 17 MAY 2024

SCH "A" PART-I (RING MAIN POWER SUPPLY AND ALLIED WORKS)

Excavation in trenches not exceeding 1.5m wide and exceeding 1.5m but not exceeding 3.0m in depth for foundation, etc. or for shafts, wells, cesspits, manholes, pier holes, etc not exceeding 10 Sqm on plan and getting out in any type of soil complete all as specified and as directed.

Earthwork is deemed to be carried out by manual method. However mechanised method may be adopted without any extra cost to the government.

Returning, filling in, including spreading, leveling, watering and well ramming in layers not exceeding 25cm in any type of soil complete all as specified and as directed.

Removing excavated surplus soil to a distance not exceeding 50m and depositing where directed at a level not exceeding 1.5m above the starting point complete all as specified and as directed.

Fine sieved excavated dry soil laid to required width of trench at bottom and top for cable cushioning all as specified and as directed.

(a) Punned thickness only shall be measured.

(b) The soil used shall be free from sharp grains and deleterious materials like dry / decayed plants etc.,

Precast concrete cable cover un-reinforced. class HV, Type 1, flat, size 300mmx l80mm x 40mm complete all as specified and as directed.

Supply, laying, connecting and testing HT UG cable XLPE insulated, screened, PVC bedded, galvanised steel strip or wire armoured, electric power cable (heavy duty) with aluminium conductor, 11000 volts grade, (Earthed), 3 core, cross sectional area 95 sqmm in bridges / culvert / trenches / drawn through pipe / fixed on walls / bare in road crossings / paths / drains / ducts / floors / fixed on poles / equipments complete all as specified and as directed.

(a) Earthwork, sand cushioning, protection for cable etc., as required shall be measured and paid separately.

(b) Lugs and glands shall be used appropriately wherever required while connecting cables to the panel board and the quoted rates are deemed be include for the same.

Supply and fixing Outdoor termination heat shrink type joint for 11 KV (Earthed) grade underground cable Each including materials and accessories including labour complete for making joint suitable for HT UG 3 core, XLPE/ armoured heavy duty cable with aliminium conductor of size 3 core, 95 sqmm complete all as specified and as directed.

Supply and fixing straight through heat shrink type joint for 11 KV (Earthed) grade underground cable Each including materials and accessories including labour complete for making joint suitable for HT UG 3 core, XLPE/ armoured heavy duty cable with aliminium conductor of size 3 core, 95 sqmm complete all as specified and as directed.

Supply and laying in trench/fixing on pole galvanised iron tubing, light grade of size 80 mm dia including necessary fittings etc. complete all as specified and as directed.

Supply, installation, testing and commissioning of HT 11 KV Extensible ring main unit outdoor type 3 WAY WITH IP 55 PROTECTION with internal copper bud bar or higher protection to RMU, SF6 gas insulated compact switch gear, comprising of load break switch -2 nos incoming and 1- no outgoing all of 350 MVA of rating 630Amps having cable termination from front/ rear/bottom, having short circuit withstand capacity of 21KA/3SEC, permanently enclosed in a tank made by sealing non magnetic/ non ferritic stainless steel sheet, to provide IP67 degree of protection to live parts and internal Arc protection (IAC 20KA /1-SEC for tank), duly filled with SF6 gas with leakage rate less than 1% and meet the desired configuration, the earth bus bar shall boot of copper flat and provided inside the cable chamber throughout the switch gear including necessary PCC foundation.etc. Complete all as specified and as directed.

(a) RMU shall be fitted with following accessories completely such as terminal boots, VPIS, Cable support, termination bolts, manometer as per IEC Standards 62271-200, 60056, 50129, 60265, 60420,60529 & 60694, bolted bushing at the top outside the tank for connecting external bus bar in case of extension.

(b) Each load break switch module shall comprise of manual operated 1-1 KV 3 Position load break switch with snap action knife bladed mechanism, suitable up to 630 Amps of rated current with associated earth switch of making capacity.

(c) True positions mechanical indication of switch positions ON OFF and Earth on the front side.

(d) Live cable LED indication energized through capacitive voltage shall be available on front side, without requiring any external instruments, cable bushing shall be provided inside hinged type door.

(e) Right angled cable boots instruments, cable bushings shall be provided for each phase.

(f) Cable testing facility without opening the cable covers and without disturbing the termination separate test bushing shall be provided to carry out testing at load break and shall be the integral part of RMU.

(g) Cable doors shall be Arc proof and interlocked with respective switches.

(h) Bus PT metering unit shall be made up of 3.15 mm thick CRCA sheet duly powder coated with siemes grey texture Outdoor type conforming to IS/IEC coupled to 11 KV HT LBS using extendable bus duct mounted suitable platform, Incoming and Outgoing connections of following features 3 no single phase Voltage transformers cast resin dry type of ratio 1-1 KV/V3, 1101 V3,25 VA class 1.0 with HT fuses in the primary and MCB in the secondary side.

(i) Digital electronic multi meter, removable front door with locking arrangement to prevent unauthorized access.

(j) LED Lamp for illumination, space heater for thermostat, RYB indication lamp for both incoming and outgoing, 11 KV KV CT ratio 400/5 Amps, Class L.O/5p10, burden 15 VA -set of three.

Earthing complete with galvanised iron earth plate electrode 600mm X 600mm X 6mm thick buried directly in ground earth pit not less than 2.25m deep below normal ground level with the top edge plate at a depth of not less than 1.5 below normal ground level connected to GI earth strip 32x6 mm dia, by means of bolts, nuts, check nuts and washers made out of GI and GI earth protected by 40 mm bore light grade GI pipe, watering arrangement by provision of 20mm dia GI pipe medium grade with cast iron funnel, provision of test point and connected to main control board all as shown in electrical plate No3 of SSR Part I including necessary earth work and excavation in any type of soil and PCC 1:2:4 type B-1 in chamber and40 mm thick RCC 1:2:4 Type B-1 cover slab with 6 mm dia mild steel bars at 100 mm centre to centre both ways with 6mm dia M S hooks complete all as specified and as directed.

rvelectricals

PSK Enterprises

ABM ELECTRICALS

G.L.THIRUMALAI NAIDU AND COMPANY