Selecting Protective Devices Handbook

SPD Handbook

Selecting Protective Devices Handbook (SPD)

This comprehensive guide to electrical overcurrent protection and electrical design considerations is based on the 2008 NEC®.

This handbook, with a value of $49.95, is now available free of charge and requires only a short registration process to receive downloading links.

Sections and contents are listed below.

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Introduction

Fuseology

  • Overcurrent and Voltage Ratings
  • Voltage Ratings & Slash Voltage Ratings
  • Amp Rating and Interrupting Rating
  • Selective Coordination & Current Limiting
  • Non Time-Delay Fuse Operation
  • Dual-Element, Time-Delay Fuse Operation
  • Dual-Element Fuse Benefits
  • Branch Circuit & Application Limited Overcurrent Protective Devices
  • Branch Circuit Fuse Selection Chart (600V or less)
  • Branch Circuit Fuse Dimensions
  • Cooper Bussmann Branch Circuit, Power Distribution Fuses
  • Disconnects, Panelboards, & One-Time Fuses
  • Fuse Holders, Fuse Blocks, Power Distribution Blocks & Surge Suppression
  • High Speed Fuses
  • Medium Voltage Fuses

Circuit Breakers

  • Interrupting Rating vs. Interrupting Capacity
  • Single-Pole Interrupting Capability
  • Series Rating: Protecting Circuit Breakers
    • Square D Series Rating Chart
    • Cutler-Hammer Series Rating Chart
    • General Electric Series Rating Chart
    • Siemens Series Rating Chart

General

  • Small Conductors
  • Tap Conductors

Cable Limiters

Conductors & Terminations

Equipment Protection

  • Transformers — 600V or Less 69 - 70
  • Transformers — Over 600V 71 - 72
  • Photovoltaic (PV) Systems 73 - 75

Component Protection

  • Introduction and Current-Limitation
  • How to Use Current-Limitation Charts
  • Wire & Cable
  • Tap Conductor Sizing
  • Small Wire (16 & 18 AWG)
  • Busway
  • HVAC and Refrigeration Equipment
  • Transfer Switches
  • Ballasts
  • Short-Circuit Current Rating Marking Requirements
  • Determining Assembly SCCR: Two Sweep Method
  • Umbrella Fuse Limits
  • Determining Assembly SCCR: Example
  • Increasing Assembly SCCR
  • Introduction
  • Fuses
  • Fuse Selectivity Ratio Guide
  • Fusible Lighting Panels
  • Fuse Selective Coordination Example
  • Circuit Breakers: Operation Basics
  • Circuit Breakers: Achieving Selective Coordination
  • Fuse & Circuit Breaker Mixture
  • Mandatory Selective Coordination Requirements
  • Why Selective Coordination is Mandatory
  • System Considerations
  • OCPD Choices for Selective Coordination
  • Inspection Checklist
  • Objections & Misunderstandings
  • Elevator Circuits

Ground Fault Protection

  • Introduction & Requirements
  • Overcurrent Protective Devices
  • GFPR Considerations
  • Current-Limitation
  • Introduction
  • Arc-Flash Protection
  • Maintenance Considerations
  • Arc-Flash Hazard Analysis
  • Arc-Flash Incident Energy Calculator
  • Arc-Flash Hazard Analysis
  • Arc-Flash Protection Marking
  • Branch Circuit Devices and Disconnect Selection Tables
  • Motor Branch Circuit Devices
  • Motor Circuit Branch Circuit Protection — Is Resettability of Value?

Motor Protection

  • Voltage Unbalance & Single-Phasing
  • Basic Explanation

Motor Branch Circuit Protection — NEC® 430.52 Explanation

Motor Circuit Notes

Motor Circuits — Group Switching

Motor Circuit Protection Tables

  • NEC® Article 430 and Tables Explanation
  • 200Vac Three-Phase Motors & Circuits
  • 208Vac Three-Phase Motors & Circuits
  • 230Vac Three-Phase Motors & Circuits
  • 460Vac Three-Phase Motors & Circuits
  • 575Vac Three-Phase Motors & Circuits
  • 115Vac Single-Phase Motors & Circuits
  • 230Vac Single-Phase Motors & Circuits
  • 90Vdc Motors & Circuits
  • 120Vdc Motors & Circuits
  • 180Vdc Motors & Circuits
  • 240Vdc Motors & Circuits

Motor Protection — Tips for Electricians & Maintenance Crews

Motor Starter Protection

  • Graphic Explanation
  • Low Voltage Motor Controllers
  • Type 1 vs. Type 2 Protection

Motor Controller & Fuse Selection for Type 2 Protection

  • General Electric Company — IEC
  • General Electric Company — NEMA
  • Rockwell Automation, Allen-Bradley — IEC
  • Rockwell Automation, Allen-Bradley — NEMA
  • Square D Company — IEC
  • Square D Company — NEMA
  • Siemens — IEC
  • Siemens — NEMA
  • Cutler Hammer Freedom Series — IEC
  • Cutler Hammer Freedom Series — NEMA

Motor Circuits with Power Electronic Devices — Power Electronic Device Circuit Protection

Motor Circuit Protection — Group Motor Protection

Motor Control Circuit Protection

Medium Voltage Motor Circuits — R-Rated Medium Voltage Fuses

 

  • Fusible Equipment vs. Circuit Breaker Equipment
  • Preventive Maintenance

Short Circuit Current Calculations

  • Introduction
  • Three-Phase Short Circuits
  • Single-Phase Short Circuits
  • Impedance & Reactance Data
  • Conductors & Busways "C" Values

Voltage Drop Calculations

  • Ratings of Conductors and Tables to Determine Volt Loss
  • Copper Conductors — Ratings & Volt Loss
  • Aluminum Conductors — Ratings & Volt Loss

Fuse Diagnostic Sizing Charts

  • Ballasts
  • Capacitors (NEC® 460)Electric Heat (NEC® 424)Mains, Feeders, Branches
  • Motor Loads (NEC® 430)Solenoids (Coils) 251
  • Transformers 600V Nominal or Less
  • Transformers Over 600V Nominal
  • Solid State Devices

Fuse Sizing Guide — Building Electrical Systems Fuse Specifications

  • Suggestions
  • Suggested Fuse and Fusible Equipment Specifications

Cooper Bussmann Current-Limiting Fuse Let-Through Data

Glossary

Electrical Formulas

2008 NEC® Section Index

Index

Fuse Cross Reference & Low-Peak Fuse Upgrade