Military Engineer Services Tender

Supply & laying Galvanised iron strip 32 x 6mm buried in ground for earthing including taking down complete all as specified and as directed.

[viii] Circuit Breakers shall have Two Positions: Open or Disconnected and Closed. A separate and independent 3 Position Earthing Switch and disconnector shall be fitted to open and earth the cables in such way that interlocks prevent all unauthorised operations. An operating mechanism shall be used to manually close the circuit breaker and charge the mechanism in a single movement. An independent mechanism shall be fitted for the 3 Positions Earthing Switch and Disconnector Circuit breaker shall be fitted with a local system for manual tripping by an Integrated Push Button. There shall be no automatic reclosing. Circuit Breaker shall have a min of 2000 Mechanical and Electrical Operations and 50 Nos Short Circuit Operations, Disconnector and Earth Switch shall have a minimum of 1000 [M1] Mechanical Operations , 100 Electrical Operations at rated current. [C] Space Heater with thermostat

[A] RMU shall be floor mounted, 11 KV, 630 Amps, 21 kA for 3 Seconds, SF6 Insulated, Motorized, outdoor, extensible type, RMU shall be type tested in line with latest IEC Standards, suitable for operations at a height up to altitude 1000 Meters above sea level and Ambient Temperature range from 5ºC to 50ºC without any de-rating, Switchgear and Busbar shall all be contained in a Stainless Steel Enclosure [Minimum 2.0mm thick SS 304 Grade filled with SF6 at 0.3 Bar [300 hPa] Relative Pressure, RMU Tank shall provide Full Insulation and Switchgear shall be insensitive to the environment with Degree of Protection of IP67, Switchgear Operating Mechanism shall have an IP2X Protection and Cable Chamber shall have IP3X Protection, Outer Enclosure shall be IP 54 type tested, Powder Coated with Pure Polyester Based Paint, suitable for the site installation conditions, Accidental Overpressure due to an Internal Arc is limited by the opening of the safety valve, at the bottom of the metal enclosure, away from the operator, Plug in type of extensibility must be provided and coupling busbar should not be exposed to air to avoid oxidation of busbars.There should be temperature sensor at each cable side bushing for bother breaker and LBS .