Section 54, The National Power Authority Act, 1982

For the purpose of inspecting any part of an installation or fittings, removing meters or other instruments for measuring the quantity of energy supplied, making or removing connections between mains and private fittings, repairing damage, or for other proper cause, any person authorised by the General Manager in that behalf, may between the hours of six o'clock in the morning and six o'clock in the afternoon enter upon any premises to which energy has been, is, or will be supplied. [Margin: Procedure in case of dangerous defect in installation or apparatus.]