Amendment 0008 Attachment 11699393.pdf

This document is a technical specification section for a Power Generation Microgrid project at Cape Cod Space Force Station in Bourne, Massachusetts. The specification details electrical protection and power distribution equipment requirements for the microgrid installation.

The document specifies circuit breaker requirements including ground fault protection with adjustable settings, enclosed circuit breakers to UL 489 standards with specified voltage and current ratings, and motor short-circuit protectors (MSCPs) compliant with UL 508 and UL 489 and NFPA 70 standards. For transformers, the specification requires NEMA ST 20 general purpose, dry-type, self-cooled, ventilated units housed in NEMA 1 enclosures. Transformer tap requirements include two 2.5 percent taps above and four 2.5 percent taps below nominal capacity for units 15 kVA and larger. Insulation systems must meet 220 degrees C for transformers 15 kVA and greater with temperature rise not exceeding 80 degrees C under full-rated load in maximum 40-degree ambient conditions, or 180 degrees C for units 10 kVA and smaller with equivalent temperature constraints. Transformers are specified with 480V primary and either 80 or 115 degrees C temperature rise, with kVA ratings from 37.5 to 100 for single phase or 30 to 500 for three-phase energy efficient type, subject to compliance with 10 CFR 431, Subpart K efficiency standards.