The Electricity Supply Rules made under Section 15 of the Electricity (Inspection) Act Chapter 54:72 provides for variation of six percent above or below the declared voltages.

Electrical equipment must be used by Consumers in such a manner as not to cause unusual voltage fluctuation or other disturbances to the Commission’s system. The Commission will require Consumers at their own expense to install suitable apparatus to limit such voltage fluctuations and disturbances. The Commission reserves the right to take whatever action it considers necessary to correct or prevent such disturbances from unduly affecting the quality of supply to other Consumers.

See T&TEC Act 42 of 1945: Supply of Electrical Energy