This is a refurbishment of an existing office building. Existing DBs (single meter for small power & lighting) need to be replaced. Should split metered boards be installed for landlord are in addition to tenant areas
I think quite a bit more info is needed to understand the question properly - how is the lighting and power to be charged for, and are they at different rates and or from different suppliers ?
Are meters for power and lights for tenants already split and if so how and why - do the tenants get more than one bill for example?
Are these sub- meters used for re-selling electricity or the only meter between the street main and the load.
Is this something the landlord or their insurers have requested ? In a small set-up you'd expect one meter per tenant and another for everything else, but it sounds more complex than that.
Mike.
I checked APDL and it states the following:
Energy submetering systems should be installed in new buildings, or when fixed building services
are provided or extended in an existing building, and should meet all of the following requirements.
a. The various end-use categories, such as heating, lighting and cooling, should be submetered in
such a way that at least 90% of the annual energy consumption of each fuel can be assigned to
an end-use. Detailed guidance on how to achieve this is given in CIBSE’s TM39.
"Fixed building service in an existing building" - some services remain in place some new. The way I read that is if tenant load doesn't make up 90% landlord needs to be sub-metered too?
Indeed there is a need to be able to record the lighting consumption, since 2021
Energy submeters
5.17 Energy submetering systems should be installed in new buildings, or when fixed building services
are provided or extended in an existing building, and should meet all of the following requirements.
a. The various end-use categories, such as heating, lighting and cooling, should be submetered in
such a way that at least 90% of the annual energy consumption of each fuel can be assigned to
an end-use. Detailed guidance on how to achieve this is given in CIBSE’s TM39.
b. Metering should enable the comparison of forecast energy use and in-performance energy and
facilitate energy reporting. This can be demonstrated by basing the submetering strategy on a
design-stage energy forecast for the building, using one of the methodologies in paragraph 9.4.
c. Metering should allow the energy use of different tenants within the building to be separately
monitored.
d. The outputs of any renewable systems should be separately monitored.
e. In buildings with a total useful floor area greater than 1000m2, automatic meter reading and data
collection facilities should be installed
and also
Part L 2021 requirements for light metering:-
6.61 - General lighting and display lighting should be metered by one of the following methods.
in fact (I must have slept through that ;-) ) it was discussed here (as in here). however I'd not expect a large no of supplies and full current meters just a row of DIN rail indicators examples at the most if this function is not already being included already as part of some integrated building control system.
Mike
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