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Metering and Installation
 

» Metering
» Meter Sockets
» Single Meter Installations
» Multi-Metering Installations
» Metering Current transformers (CTS)
» Metering High Tension Services
» Meter Seals

METERING

Meters are installed by the Company to record the electrical energy and, in large installations, the maximum demand used by customers.

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METER SOCKETS

Meter socket bases for loads up to, but not exceeding 200 amps are to be supplied and installed by the customer. Customers are responsible for the proper maintenance of these socket bases and should have their electrician contact the Company to allow them access to carry out such maintenance. For individual services in excess of 200 amps the Company will provide a meter socket base and the required metering CTs.

Location of socket base on the building

The meter should be placed in a location which will be accessible at all times to BLPC meter readers. In cases where it can be determined that the customer plans to fence the property, the customer is encouraged to have an underground supply and place the meter on the guard wall at the boundary of the property. In this case the meter should face outwards towards the roadway and comply with the Company’s requirements.

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SINGLE METER INSTALLATIONS

a) Type of Socket Base - A 5 jaw socket is required for all 3 wire services with the 5th jaw connected to the neutral conductor.

b) Height of Socket Base - The meter socket should be at a height of about 1675 mm (5' 6") above finished grade. In underground installations where the meter is to be located on an external guard wall, the minimum allowable height is 1 metre. Figure 20 shows a typical metering installation for an underground service.

c) Wiring of Socket Base - The wiring in the socket base should be neat, not bulky, and connected as shown in Figure 19 . Any excess wire in the socket base may prevent the meter from being properly inserted into the socket.

d) Secure Mounting of Socket Base - The meter socket base should be properly secured to the building.

e) Waterproof - The point at which the conduit enters the meter socket base should be properly sealed to prevent water from entering into the socket. All equipment installed outdoors should be designed for outdoor use as it will be exposed to the weather.

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MULTI-METERING INSTALLATIONS

On installations involving more than one meter (Multi-metering) the customer shall provide the multi-metering equipment and the following conditions shall apply.

a) In multi-metering installations the meters shall be grouped together in an approved location, preferably on the ground floor in a public or common area as near to the entrance as possible. Each service shall be separately identified and permanently marked on the outside of the respective meter socket.

b) Meter sockets must be suitable for the type of meters and characteristics of the supply provided by the Company.

c) Where up to six meters are involved, they should be grouped in one location. Where there are more than six meters, groups of not fewer than six meters will be permitted in accessible locations on the ground and upper floors of the building.

d) The multi-metering equipment shall be so designed and located that the uppermost meter shall be no higher than 1675 mm (5' 6") and the lowest meter shall be not lower than 750 mm (2' 6") from finished grade. Provision should be made for the Company to seal all unmetered sections of the installation to prevent unauthorised access. These installations should be discussed with a representative of the Company prior to purchase of the equipment.

e) Individual circuit breakers are to be installed on the load side of the meters.

f) All trunking which houses unmetered wiring shall be made with provision for sealing with Company seals.

g) If trunking is used, the line ends and load ends should be kept in separate trunking. Customer load wires shall never be installed in trunking that contains unmetered wires.

h) Multi-metering installations which are located outdoors shall have equipment designed for outdoors as it will be exposed to the weather.

i) Suitable means for disconnecting the entire building shall be provided in accordance with the requirements of the GEED.

Typical arrangements for multi-metering installations are shown in Figure 21 and Figure 22 . A large low tension installation may require the customer to provide either a Transformer Room or space for a padmount transformer.

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METERING CURRENT TRANSFORMERS (CTS)

For services in excess of 200 amps the Company will provide metering current transformers (CTs).

For transformer room installations Bar Type CTs shall be installed within the Transformer Room. BLPC will supply and the customer shall install these CTs in accordance with BLPC requirements. A conduit shall be installed by the customer from the CTs to the location for the meter socket base. The meter shall be located on the outside of the transformer room.

For padmount transformers window type CTs can be installed by BLPC on the secondary bushings of the transformer and the meter located on the side of the padmount transformer low tension compartment. This will only be possible where the transformer provides supply to a single customer.

For multi-metering installations where a single service is in excess of 200 Amps, the customer should provide a sealed panel suitable for the installation of the necessary bar CTs.

The secondary metering conductors running between the meter and the CTs must be 8 metres (25 feet) or less.

Note: In some cases it may be necessary for the Company's metering CTs to be installed in the customer owned service equipment. Arrangements must be made by the customer with BLPC to cover each specific case. In any event the CTs shall be placed in a lockable enclosure which is inaccessible from any other portion of the customer's service equipment and can be sealed. The CTs should be located before the main circuit breaker for the particular service as shown in Figure 16 .

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METERING HIGH TENSION SERVICES

In the case of customers who own their transformers and are on the Large Power (LP) tariff a High Tension (HT) Metering Unit will normally be installed by the Company.

In all cases the HT Metering Unit will be provided and installed by the Company in a location to be determined by the Company. This may be either a pole mounted unit or a padmount unit. In cases where a padmount HT Metering Unit is required the customer will be required to provide adequate space and a concrete pad in a suitable location for this to be installed. Provision will need to be made for the meter to be installed in accordance with the other requirements of this booklet so that the meter reader has ready access to read and reset the meter.

Note: In some instances Low Tension (LT) metering may be used for Large Power customers and the Company will install the necessary equipment. For billing purposes, in the case of LT metering, a special rate will be used to take into account the transformer losses.

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METER SEALS

Seals are placed on unmetered installations as a security measure. Seals should NEVER be broken by anyone other than by authorized Barbados Light & Power personnel. Breaking seals is a very serious offence and The Barbados Light & Power Company Limited reserves the right to disconnect existing services, or refuse to connect new services in situations where seals have been broken, until the matter has been fully investigated and resolved to the satisfaction of the Company.

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