Basic Circuitry
NEC
Acronyms
NFPA
100

A circuit with almost zero resistance

Short Circuit

100

This article covers the topic of definitions

100

100

OCPD

Over Current Protection Device

100

NFPA 70

National Electrical Code

200

A circuit with infinite resistance

Open Circuit

200

This article covers the topic of Branch Circuits

210

200

EGC

Equipment Grounding Conductor

200

NFPA 70E

Standard for Electrical Safety in the Workplace

300

A circuit where the current only has 1 path to travel

Series Circuit

300

This article covers the topic of Overcurrent Protection

240

300

GEC

Grounding Electrode Conductor

300

NFPA 72

National Fire Alarm and Signaling Code

400

A circuit where the current has more than 1 path to travel

Parallel Circuit

400

This article covers the topic of Motors, Motor circuits, and controllers

430

400

CCTV

Closed Circuit Tele-Vision

400

NFPA 78

Guide on Electrical Inspections

500

A circuit that contains both series and parallel circuits

Combination Circuit

500

This article covers the topic of RMC

344

500

CATV

Community Antenna Tele-Vision

500

NFPA 1

Fire Code