Specifications

PIP ELCGL01
November 2002 Electrical Design Criteria
Process Industry Practices Page 9 of 20
3.11.2 Doors shall be equipped with panic hardware and shall be self closing.
3.11.3 When specified on the Data Sheet, doors shall be lockable and equipped
with “night latch action (self locking).”
4. Electrical Area Classification
4.1 Electrical area classification shall be defined using PIP ELEHA01 unless specified
otherwise on the Data Sheet. PIP ELEHA01 must be used in conjunction with other
standards that define the basis for area classification, such as NFPA 497, NFPA 499,
API RP500, and API RP505.
4.2 See Data Sheet for the classification method to be used.
4.3 Area classification drawings shall be submitted to the owner for review and
approval. Drawings shall be approved by the owner before purchase of electrical
equipment.
4.4 In general, all buildings containing only electrical equipment, such as electric rooms
and control rooms, shall be located in unclassified areas. With specific written
approval by the owner for each application, air pressurization may be used to
maintain the interior of a building as an unclassified area. These applications shall be
designed in accordance with NFPA 496.
5. Power Distribution
5.1 System Configuration
The plant distribution system configuration shall be as specified on the Data Sheet.
5.2 Utility Interface and Unit Substations
5.2.1 Unit substations shall be centrally located in the area where the loads to be
served are situated.
5.2.2 Unit substations shall be located in unclassified areas.
5.2.3 Utility interface and unit substations shall be designed as specified on the
Data Sheet. When specified on the Data Sheet, HVAC and pressurization
systems shall be provided.
5.2.4 Unless specified otherwise on the Data Sheet, single-ended unit substations
shall be designed for expansion in at least one direction. In this case, floor
space shall be reserved for the addition of one or more vertical sections as
specified on the Data Sheet.
5.2.5 If specified on the Data Sheet, design of single-ended substations shall
allow for future conversion to double-ended (secondary selective)
substations.
5.2.6 If specified on the Data Sheet, design of double-ended substations shall
allow for future expansion.