LIGHTING
NEW POWER SUPPLY CASE STUDY
Davenants School
Davenants School in Essex needed a power supply for six
new tennis courts and a clubhouse, we look at how they
dealt with the application
A
fter an enquiry to lay in a authorities in England and Wales are on the front, measures approximately
new power supply for six ten- likely to introduce shortly. The electric- 600mm x 600mm x 200mm deep.
nis courts and a clubhouse at ity company couldn’t quantify it, as the If there was insufficient space in the
Davenants School in Essex, a costs were not within its control, but ad- club premises, then an external enclo-
formal quotation was obtained from an vised that they couldn’t be absorbed. To sure would be needed located close to
electricity company. this basic price, the club also needed to the facility and the cost for this would
This comprised 11 pages of text, plus add the works by a local contractor. need to be established.
an A3 drawing of the new cable route While the text of the electricity com-
and two guidance sheets – the latter pany quote ran to many pages, it was Other matters addressed to
regarding the trenching standards to be only on the attached drawing that the complete the cost estimates
applied to the new installation. scale and content of alterations to the for the new supply
A new three-phase supply, rated at 70 existing intake equipment were iden- 1. Attention was drawn to the quote’s
Kva was required, so a service cable had tified. These alterations needed to be need for two agreements to be in place,
to be run from the connection point, done by a local NICEIC registered con- before connection could be made.
The Supply Agreement was made with
the supplier of electricity to the site. As
The electricity company quote contained a safety note that
the new supply was a maximum demand
called for the use of qualified contractors and electricians
type it would attract availability and de-
mand charges, as well as unit charges for
the power used by the facility.
shown on the drawing, into the club- tractor and it’s our experience that these As also stated by the electricity com-
house. As per the company’s document, costs are approximately equal to 50 per pany, there was a need to discuss and
this would be in trenches and cable cent of the electricity company quote establish these costs with the supplier,
ducts installed by a local contractor and (approximately £650 plus VAT). prior to accepting the quotation – to
strictly to their requirements. In this instance the club considered ensure that the running costs were fully
The quote was £1,278.00 plus VAT, that the cable trenching work could be understood by the school.
however on checking the small print, done in-house to minimise the over- The Connection Agreement had to be
this excluded potential new charges all cost. However, this approach wasn’t made with the electricity company on
for a street works permit that local recommended because of the need for their form of contract, included in du-
strict compliance with the electricity plicate with the quotation. This commits
company’s specification. the club to taking the 70 Kva service for
The drawing showed that the new a minimum period of five years.
cable would be terminated in a 2. Certification of the installation
400 amp ‘cut-out’ and would be The electricity company quote also con-
current transformer-metered. tained a safety note that called for the
To give some scale for the space re- need to employ a qualified contractor
quired for the cut-out (see left), the and electrician to issue a certificate, once
measurements were approximately the alteration works necessary to accom-
500mm wide x 500mm high x 250mm modate the new cut-out and metering
deep and the CT box, with the meter equipment was completed. Also, the cer-
tificate has to confirm that the existing
The picture on the left illustrates the cut electrical installation within the school
out / CT meter set up, in an IP55-rated site complies with BS 7671 as amended
steel enclosure. before proceeding. ●
48 Read Sports Management online
sportsmanagement.co.uk/digital Issue 3 2009 © cybertrek 2009
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84