How to Install a electric Sub-Meter

use electric meters installed at customers’ premises to measure electric energy delivered to their customers for billing purposes. They are typically calibrated in billing units

What is a standard electric meter?
Standard meters are the most common type of meter in the UK. Standard meters usually measure your electricity consumption in terms of kWh or kilowatt-hours (this is the number of units of energy you use in one hour). These meters usually present a reading in numbers.