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Immingham Storage Company Limited – East Terminal
No.7 Switchroom - Basis of Design
P & I Design Ltd
DOCUMENT NO: SI451001_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: C DATE: 10.08.12
Tel: + 44 (0)1642 617444
PAGE 4 OF 12
Fax: + 44 (0)1642 616447
www.pidesign.co.uk3
ORIGINAL INSTALLATION
An 11kV supply from ABP feeds an 11000/3300/415V transformer located in an outside
location adjacent to the main office building. Information supplied indicates this to be
rated at 850kVA (500kVA at 3300V plus 350kVA at 440V). The 3300V supply from the
transformer feeds two fire pump starters located in No.3 Switchroom. The 415V supply
feeds all LV supplies in No.3 Switchroom, No.3 Pump House and No.7 Switchroom as
shown below.
11kV Supply From ABP
No.3 Switchroom
400A
Fused
Switch
(AC)
400A
Fused
Switch
(EE)
Various Loads
Various Loads
No.3 Pump House
Various Loads
Various Loads
(See section 5.2)
No.7 Switchroom
200A
P30025
P30015
Fire Pump
Starters
415V
(350kVA)
3300V
(500kVA)
It has not been possible to establish the maximum demand placed on the 415V supply from
the transformer. It is known however that the combined load of No.3 switchroom, No.3
Pump House and No.7 switchroom does not exceed 460A i.e. the transformer rating. Given
that there is a significant connected load in No.3 Switchroom it is also reasonable to
deduce that even though there are two separate 400A feeds to No.3 Pump House, these two
feeds combined do not exceed 400A in total.