Karnataka Power Transmission Corporation Ltd

Wiring Consumer premises & Maintenance

Power Factor

Metering,Charges & Security

Miscellaneous

Prejudicial use of supply

Appeals

General

WIRING ON CONSUMER’S PREMISES AND MAINTENANCE

GENERAL WIRING CONDITIONS

Mains -The Consumer’s mains shall in all cases be brought upto the Licensee’s point of supply, and sufficient cable shall be provided for connecting up with the Licensee’s apparatus.

Switches & Fuses - The Consumer shall provide linked quick break main switch and a single pole fuse on each conductor except on the neutral conductor which shall be fixed as near as possible to the Licensee’s meter board. Single pole switches controlling the lamps or fans or other apparatus shall be inserted in the phase wire and not on the neutral wire.

The Licensee’s meter and mains cutouts shall be enclosed in a strong teakwood box / metal waterproof box suitably ventilated and provided with a hasp, staple and lock. All wires between which a difference of potential over 230 volts exists shall be made inaccessible to unauthorized persons or enclosed in an earthed metallic casing or conduit. A "Caution" board printed in Kannada and Hindi / English shall be fixed therein.

Earthing – Gas / water pipes shall on no account be used for earthing purposes. All wiring shall be kept as far as possible away from gas and water pipes.

Domestic Appliance – A special circuit solely for the use of domestic appliances, which will be approved by the Licensee, shall be run from the Licensee’s point of supply. Wall plugs used on these circuits shall be of the three-pin type, the third pin being an earth connection. Two pin plugs or lighting sockets shall not be allowed. All appliances used must be effectively earthed. The minimum size of earth wire permitted is No. 14 S.W.G. or 3.0 sq. mm.

Each equipment or apparatus installed shall have a nameplate indicating wattage.

Plugs – Single pole switches controlling the plugs shall be inserted in the phase wire and not on the neutral wire.

Wiring – Single leads shall not be allowed to be run separately in iron conduit.

A.C. Motor Installations – Motors shall be provided with control gear fitted with a no-volt release and Triple Pole fuses (overload release) so as to prevent satisfactorily the maximum starting current from the Consumer’s installation exceeding the limits given in the following schedule at any time under all possible conditions. It is important that the releases shall be maintained in good working order. Failure to comply with this specification will render the Consumer’s installation liable for disconnection from the supply on account of disturbance to the Power Supply to other Consumers: -

Nature of supply

Size of Installation

Limit of Maximum Current

Single Phase

Upto and including 1 B.H.P.

Six times the full load current.

Three Phase

Above 1 B.H.P. and upto and including

10 B.H.P.

Above 10 B.H.P. and upto and including

15 B.H.P.

Above 15 B.H.P.

Three times the full load current.

Twice the full load current.

One and half times the full load current.

Each three phase motor circuit shall be protected by Moulded case circuit breaker (MCCB). Wiring for motors shall be run with all three phase wires bunched in a single metallic conduit, which shall be efficiently earthed throughout and connected to the frame of the motor from which two separate earth wires of adequate size shall be run. The minimum size of the earth wire permitted is NO. 14 S.W.G. or 3.0 sq. m.m. All motor wiring shall comply in every respect with the Indian Electricity Rules, 1956 in force from time to time.

Motors above 1 B.H.P. shall be wound for 3 phases, 400 volts between phases.

Consumers intending to use non-standard apparatus, are advised to send to the Licensee full technical particulars of such apparatus before ordering it so that the Consumers can be informed about any special conditions that may be applicable to that type of apparatus, to enable it to be connected to the mains.

The L.T. Consumers shall provide current limiters of suitable capacity, which must be erected within one metre of the Licensee’s meter board or in such other position as, shall be approved by the Licensee. No fuses shall be provided on the neutral conductor.

All AEH Consumers shall provide load limiter of required capacity for their installation, which shall be properly sealed. In addition to the load limiter, the AEH Consumer shall provide suitable capacity earth leakage circuit breaker (ELCB).

Independent starters provided with over current and no volt devices shall be provided for motors as noted below : -

Upto & inclusive 5 HP

Direct online Starter

Upto& inclusive 30 HP

Star-Delta starter/Auto transformer starter

Above 30 HP

(a) Squirrel cage Motors

(b) Wound rotor Motors

(a) Auto Transformer Starter

(b) Rotor resistance starter

Note: However the Designated authority of the Licensee in special circumstances may relax the above requirements depending upon the location and conditions of the working of the installation by an order in writing.

In the case of H.T.Consumers, suitable protective devices approved by the Licensee shall be used so as to afford full protection to the Licensee’s apparatus placed on the Consumer’s premises.

HANDLING OF LICENSEE'S EQUIPMENTS IN CONSUMER'S PREMISES
1	The meter, meter boards, service mains, main cutouts, load limiters etc., must on no account be handled or removed by any one who is not an authorised employee of the Licensee. The seals, which are fixed on the meters / metering equipments, load limiters and the Licensee’s apparatus, must on no account be broken. The responsibility for the safe custody of Licensee’s equipments and seals on the meters / metering equipments with in the Consumer’s premises shall be on the Consumer.
2	In case of H.T. installations the Designated authority of the Licensee at his discretion, may permit the Consumer on written request, to operate Licensee’s terminal switches, fuses or circuit breakers for the purpose of isolating the Consumer’s apparatus in case of emergency. However, the Consumer is solely responsible for any damage caused to life or property due to such operation.
3	All transformers, switchgear and other electrical equipment belonging to the Consumer and connected to the mains of the Licensee shall be maintained as per relevant IS.
4	In the event of any damage caused to the Licensee’s equipments in the Consumer’s premises by reason of any act, neglect or default of the Consumer or his employees, the cost thereof as claimed by the Licensee shall be payable by the Consumer.

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