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Electrical Meters & Monitoring

An electricity sub-meter measures the power used by one unit, tenant or circuit downstream of the main supply meter, so that an occupant's use can be billed or monitored separately. This range holds four Metro digital prepaid meters for single-phase and three-phase supplies, each rated IP54, MID certified and using PayPoint vending, and a Haydon inline DC volt and amp meter for checking low-voltage equipment.

Choosing Electrical Meters & Monitoring

Electric meters measure how much electricity a supply uses: the prepaid models here are Metro prepayment meters for landlords, and a Haydon inline meter reads the DC volts and amps of a CCTV camera supply. The choice between the Metro meters comes down to supply type, current and how the occupant pays.

Single phase or three phase

The MET001 and MET004 are single-phase meters rated 80A and the MET200 is single phase at 60A. The MET003 is a three-phase prepaid meter rated 100A for workshops, plant and larger units.

How credit is added

All four Metro meters use PayPoint vending, so an occupant buys a power code through PayPoint and enters it on the meter. The MET004 also has a remote keypad, which lets the meter sit in a cupboard or riser while the occupant enters credit from a more convenient position.

Where the meter goes

All four Metro meters are rated IP54 against dust and splashing water, suitable for plant rooms, outbuildings and communal cupboards.

ModelSupplyCurrentNotes
Metro MET001Single phase80AMID, PayPoint
Metro MET004Single phase80AMID, PayPoint, remote keypad
Metro MET200Single phase60AMID, PayPoint
Metro MET003Three phase100AMID, PayPoint
Haydon HAY-DC-MDC, 5-35 V7 AInline volt and amp meter

Standards & compliance

MID certification means a meter is approved under the Measuring Instruments Directive, which is the approval expected of a meter whose readings are used to bill. Check the MID status on the product page if the meter will be used for recharging electricity.

Low-voltage monitoring

The Haydon HAY-DC-M reads volts and amps inline on 5-35 V DC circuits up to 7 A through a 2.1 mm DC socket and plug, for checking the power supply to a CCTV camera.

Brands we stock in Electrical Meters & Monitoring

Haydon and Metro.

Metro supplies the four prepaid meters and Haydon the DC meter.

Related categories

For testing circuits see electrical test equipment, and for the low-voltage supplies the Haydon meter checks, DC power supplies.

Frequently asked questions

What is electrical sub-metering used for?

Electrical sub-metering measures the electricity used by one part of a property, such as a flat, a workshop or an EV charger, after the supplier's main meter. Landlords use it to recharge tenants for their own usage, and businesses use it to track energy by area. For billing, look for an MID certified meter. The range here includes prepaid single-phase and three-phase sub-meters.

What types of electric meters are there in the UK?

UK electric meters include standard credit meters, prepayment meters, smart meters and multi-rate meters for time-of-use tariffs, in single-phase and three-phase versions. Sub-meters are a separate type that sit after the supplier's meter to measure one tenant or circuit. A prepayment meter needs credit before it supplies power. The range here includes prepaid single-phase and three-phase meters.

How do you read an electric meter?

To read a digital electric meter, note the figures on the display that show kilowatt hours (kWh), usually ignoring any figures after a decimal point or shown in red. On a dial meter, read the dials in order, starting with the one on the left. Prepayment and smart meters may need a button pressed to scroll to the reading. Taking readings on a regular date makes usage easier to compare.

What is an electric meter?

An electric meter measures the electrical energy a supply uses, in kilowatt hours (kWh), so it can be billed or monitored. A supplier's meter records a whole property's usage, while a sub-meter measures part of it, such as a flat or an EV charger. Prepayment meters also control the supply against credit. The range here includes MID certified prepaid electricity meters.

Why buy from West Midlands Electrics

  • Established 1975
  • Birmingham trade counter
  • UK-only supply

Written by the West Midlands Electrics technical team

Updated