Section 13(c) in The Orissa State Electricity Board (General Conditions of Supply) Regulations, 1995
(c)L. T. Consumers - (i) Before taking the Insulation tests of Installations, wirings must be complete in every respect. All fittings such as lamps, fans, cookers, motors etc., must be connected up, fuses inserted and all switches placed in the 'ON' position before the tests are carried out. Temporary wires or fittings or dead ends, shall not be included in the installations and no part of the work should be left incomplete. The insulation resistance of the entire installation to earth shall be tested from the roadside of the Board's terminals.(ii)The Board shall not connect the installations on the consumer's premises with its works unless it is reasonably satisfied that the connection shall not, at the time of making connection, cause leakage from the installations exceeding one five thousand part of the maximum current supplied to the consumer's premises.(iii)The insulation resistance shall be measured by applying between earth and the whole system of conductors or any section thereof, with all fuses in place and all switches closed and except in case of earthed concentric wiring, all lamps in position or both poles of the installations otherwise electrically connected together, a D.C. Voltage of not less than twice the working voltage provided that, it does not exceed 500 Volts for medium voltage circuit. When the supply is derived from three wire (AC or DC) or a poly phase system, the neutral pole of which is connected to earth either directly or through added resistance, the working voltage shall be deemed to be that which is maintained between the outer or phase conductor and the neutral. The insulation resistance in megohms of an installation shall not measure less than 50 divided by the number of points on the circuit; provided that the whole installation need not be required to have an insulation resistance greater than one megohm. Heating and power appliances and electric signs may, if desired, be disconnected from the circuit during the tests, but, in that event, the insulation resistance between the case or frame work and all live parts of each appliance shall not be less than that specified in the relevant ISS or, when there is no. such specification, shall not be less than half a megohm.(iv)The insulation resistance shall also be measured between all conductors connected to one pole phase conductor and all the conductors connected to the middle wire or to the neutral or to the other pole or phase conductor of the supply. Such a test shall be made after removing all metallic connections between the two poles of the installation and in these circumstances, insulation resistance between the two terminals of the installation shall not be less than that specified in para (iii) above.
