pie-power-systemslisted

# Power Systems Skill ## At a Glance Design and validate electrical power distribution systems from utility service entrance through rack-level PDUs, covering all voltage classes from 120V single-phase through 480V three-phase. **Activates on:** InfrastructureRequest type='power', any load calculation, conductor sizing, transformer/UPS/PDU selection, redundancy architecture design. **Key capabilities:** - NEC Article 220 load calculations (connected load and optional 220.87 methods) - NEC Table 310.16 conductor sizing with temperature and conduit fill corrections - Transformer sizing (kVA, K-factor for non-linear loads, impedance selection) - UPS selection (online double-conversion, runtime calculation, redundancy modes) - PDU selection (floor-standing and rack PDU, whip ratings, phase balance) - Redundancy architectures: N, N+1, 2N, and 2N+1 with topology diagrams - Voltage classes: 120V, 208V, 240V, 277V, 400V, 480V - DC distribution patterns: 380V DC bus, 48V telecom, 12V on-board - Safety: arc flash boundaries, GFCI/GFP requirements, shock thresholds **Code references:** NEC 220 for load calculations, NEC 310 for conductors, NEC 230 for services — always reference the current locally adopted edition of NFPA 70. > **ENGINEERING DISCLAIMER:** Electrical system design must be verified by a licensed Professional Engineer or licensed Electrician before installation. Arc flash analysis, fault current calculations, and equipment grounding require site-specific engineering.