It can also be used to meter single-phase loads. Suitable for A — A applications with a pulsed output for kWh, the meter also monitors for display, other parameters, including line voltage and current. The voltage reference connection within the associated distribution board is facilitated on the main busbar, maintaining the full capacity of outgoing circuits. The A version provides independant A protection to each board.

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The CT can be fitted in a side-mounted cable extension box. One CT mount per outgoing CT. Ideally, lighting and small power loads supplied from a common board should be metered separately. The Regulations also require automatic meter reading and data collection in buildings with a total floor area greater than 1, square meters. Part L is divided into four documents. The requirements for new and existing buildings are broadly similar although the emphasis is inevitably on ensuring that new buildings are designed to conserve fuel and power.

The requirements — which also apply to fuels such as gas, LPG and oil — are intended to provide a breakdown of energy consumption by different end-use categories — lighting, heating, ventilation, pumps and fans etc.

The Regulations call for separate metering for final distribution boards greater than 50kW. Most Type B, three-phase distribution boards are rated A or more and would therefore take more than 50kW when fully loaded.

So the regulations effectively call for metering at all final distribution boards and even where this is not required, it would be good practice. Furthermore, if a board supplies lighting and small power, these loads should be metered separately.

The Regulations also call for separate metering of motor control centres feeding pumps and fan loads greater than 10kW. Meanwhile individual metering is required for boiler installations greater than 50kW, chiller installations greater than 20kW and electric humidifiers greater than 10kW. While metering is the normal process for identifying the energy use of different pieces of equipment, L2 does allow for consumption to be calculated by other means, for example, by measuring the run hours of equipment that operates at a known load.

The Regulations also call for the provision of appropriate instructions to enable owners and occupiers to attribute energy consumption to the different end-uses, as part of an overall metering strategy, and compare operating performance with published benchmarks.


Eaton MEM Memshield 3 Type A and B Distribution Boards and Devices

Construction virtually eliminates distortion during installation, ensuring final assembly fit and alignment. Unique cable trunking interface kit simplifies mounting of cable trunking and protects cables. Improved Neutral cable clamp design for simple and secure cable connection. Blanking modules have interlinking form for improved positional security. Removable busbar assembly to assist installation. Additional Functional Earthing options and Clean Earth options available. Auto-formed, curved construction of main cover adds to board rigidity, with improved appearance.


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