Ritherdon CT Chamber

The BNO CT Chamber

The Ritherdon CT Chamber was originally designed and tested for UK Power Networks who manage the electricity supply network in the southeast of England. Thousands of units are now in use and are still installed by the DNO (Distribution Network Operator) for the Southeast.  However, with the creation of the Building Network Operator (e.g. a landlord responsible for the supply network within a multiple occupancy building) this high quality CT Chamber can be used in any BNO site in the UK.

In a BNO-managed building, the responsibility of the DNO now ends just on the usage side of the cut out (intake position) and, as long as the Wiring Regs are followed, the choice of electrical equipment beyond this point is the BNO’s.

Over the years, we have manufactured enclosures for all the major regional electricity companies (RECs or DNOs) in the UK.  These include the CT Chamber and other metering panels for UK Power Networks, Mod units for Electricity Northwest, HV COP 3 and LV COP 5s for Scottish Power and Western Power Distribution.

We manufacture metering panels from metal and plastic and have a well-established supply chain for whichever components are preferred by our customers.  The focus at Ritherdon is on the higher end of quality and safety in our industrial metering panel designs.

With the introduction of the Building Network Operator, organisations responsible for multi-occupancy buildings (e.g. landlords) now have more options for how they manage their networks and also what metering equipment they use.  Our “BNO CT Chamber” has a long track record in the south and south east of England (UKPN network) and is described as the “Rolls Royce” of CT Chambers due to its build quality and safety features.  It is also relatively small and versatile making it much easier to install. Find out more about how we developed the CT Chamber together with UKPN.

What is a Building Network Operator?

A Building Network Operator (BNO) is an “organisation (often the owner or landlord) who operates the electricity distribution network within a multiple occupancy building between the intake and the customers’ installations”.

The BNO is responsible for the design and installation of the electricity supply network within their building.  The responsibility of the Distribution Network Operator (DNO) now ends just above the “cut out” or “intake position”.  As long as the Wiring Regs (BS 7671), other guidance (e.g. BS 9999 for fire safety) are adhered to and the P283 commissioning test is carried out, the choice of what equipment is installed in the building and who installs it is up to the BNO.  This includes the CT Chambers.  Give us a call to see how soon we can install one of our CT Chambers for you.  It should be possible within a matter of days.

The ‘BNO CT Chamber’

In a BNO-managed building, the responsibility of the DNO now ends just on the usage side of the cut out (intake position) and, as long as the Wiring Regs are followed, the choice of electrical equipment beyond this point is the BNO’s.

What is a CT Chamber?

When the supply to a site needs to be greater than 100 A (~70 kVA at 415 V) then the electricity meter works with current transformers (CTs) houses within their own enclosure – the CT chamber.  The power cables come onto the site, via a cut-out unit, into the CT Chamber and the Meter Operator typically mounts their meter on the CT chamber.

Reasons to use the Ritherdon CT Chamber:
  • Designed to accommodate 100 A – 600 A supplies.
  • Proven track record as the ‘top of the range’ unit for installation, quality and safety features in the southeast of England.
  • Intuitive Design – Flexibility.
  • Built-in flexibility, so they can be installed in a variety of positions to accommodate incoming supply from either the top or the bottom.
  • The front panel can be hinged from either side to accommodate local space and access requirements.
  • Avoids the requirement for costly lugging of tails.  Our CT panels are designed to accept sector stranded, sector solid or rounded stranded conductors.
  • Accepted by all meter operators.
  • The meter operator can house their meter on the front panel. This avoids requirement for further meter panels and the complexity of running multicore wiring to adjacent locations.
Installation service from Ritherdon

We are currently working with Siemens to offer an installation and testing (P283) service for the CT Chamber.  With the Ritherdon CT Chamber and Siemens’ expertise (>5000 low voltage CT connections each year, P283 commissioning capabilities etc), you will eliminate several costly stages when installing a metered supply to your site.  We will look after the organisation of all the stages between the DNO installing their cable and the meter operator installing the meter.

Please get in touch if you’d like to discuss how we can help you with you installation.

Data Sheet

Delivery on Enclosures from Stock is 48hrs from receipt of order* or within 7 working days if powder coating is required.

We always work to despatch orders sooner if we can. 

* Receipt of order: payment received and order processed.


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