Tuesday 10 June, 2008

Condition of Common Supply in HT Tariff with High Rise Building Apartments

As per KSEB Terms and Conditions of Supply, 2005, Clause 13(2)(b), "If common and essential loads in the building is 100 kVA and above, separate transformer with HT metering arrangement shall be installed exclusively for such loads".

Consider there are two buildings in the same premises. Let the buildings are having the common and essential loads of 70kVA each (So, total of 140kVA). The two buildings are physically segregated but comes under a single builder. So, they may approach with a single application (being the same premises and in future there may be a single residence association to manage) to Electrical Inspectorate and KSEB.
Consider the following two cases:-
Case 1:- Let both the buildings are fed from a single transformer. In this case, I am sure according to the above clause 13(2)(b), we can insist for another exclusive transformer for the common and essential loads, being above 100kVA.
Case 2:- If the individual buildings are fed from individual transformers? Let them fed through a common 11kV panel. Is it necessary to insist to have another exclusive transformer for the common and essential loads?, each being below 100kVA ( of the individual buildings)

The final solution I reached through discussion in Kerala Electrical Circuit [http://tech.groups.yahoo.com/group/kerala_ec/ ]
(a) if the common and essential loads are shared by both buildings and there is only one connection then H T connection may be insisted.
(b) Consider two independent transformers are fed from a common 11kV panel (1+2) and the common amenities of the two buildings are not at all shared and each of them comes around 70kVA (so the total >100kVA). In such as case, HT tariff common supply need not be insisted.

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