Short answer: Start with terms that affect how you understand protection, circuits and equipment. The glossary below uses meanings published by OSHA and CPSC. Use it to ask clearer questions, then follow your employer’s required training and your supervisor’s directions.
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Four safety abbreviations
| Short form | Full term | Plain meaning from the official source |
|---|---|---|
| GFCI | Ground fault circuit interrupter | OSHA defines this as a device for personnel protection. It deenergizes a circuit or part of one when current to ground passes a set value below the level needed to operate the supply circuit’s overcurrent device. |
| AFCI | Arc fault circuit interrupter | CPSC says installing AFCIs in a home can provide enhanced protection from fires resulting from unsafe arcing and sparking in home wiring. |
| LOTO | Lockout and tagout | OSHA uses LOTO for practices and procedures that protect workers from hazardous energy releases during service and maintenance. The employer is responsible for the energy control program and worker training. |
| PPE | Personal protective equipment | OSHA uses PPE for equipment worn to reduce exposure to workplace hazards. Its examples include gloves, safety glasses, shoes, hearing protection, hard hats and respirators. |
These meanings help you recognize the subject of a conversation. They do not tell you which device, procedure or protective equipment applies to a task. Ask the person directing the work.
Circuit and wiring words
OSHA 1926.449 defines these terms for the construction electrical rules.
| Term | Official meaning in plain English |
|---|---|
| Branch circuit | Conductors between the final overcurrent device that protects the circuit and the outlets. |
| Feeder | Circuit conductors between service equipment, or an isolated plant’s generator switchboard, and the final branch circuit overcurrent device. |
| Ampacity | The current in amperes that a conductor can carry continuously under its conditions of use without exceeding its temperature rating. |
| Grounded conductor | A system or circuit conductor that is intentionally grounded. |
| Outlet | A point on a wiring system where current is taken to supply equipment. |
| Receptacle | A contact device installed at an outlet to connect an attachment plug. |
| Raceway | A channel designed to hold wires, cables or busbars. OSHA’s examples include conduit, tubing, wireways and busways. |
| Qualified person | A person familiar with the equipment’s construction and operation and the hazards involved. |
Keep branch circuit and feeder separate in your notes. The official definitions place them on different sides of the final branch circuit overcurrent device. Keep outlet and receptacle separate too. OSHA defines the outlet as a point on the wiring system and the receptacle as the contact device installed there.
Turn a word into a useful question
When a term is unclear, repeat the exact word and ask what it refers to in the current task. These prompts keep the question narrow.
- Which branch circuit are we discussing?
- Is this point the outlet, or are you referring to the receptacle installed there?
- Which raceway are you referring to?
- What does this equipment label mean here?
- Which employer procedure applies before I take part?
Write the answer in the words your supervisor uses. Do not turn a glossary definition into an installation step.
For first year licensing, supervision, work hours and tasks, use the first year as a Texas apprentice guide. This page stays with vocabulary.
Check the terms you can explain
Terms I can explain without looking
Say each meaning in one sentence, compare it with the glossary, then check the term. Checkmarks record your own review, not verified understanding.
- GFCI
- AFCI
- LOTO
- PPE
- Branch circuit
- Feeder
- Ampacity
- Grounded conductor
- Outlet
- Receptacle
- Raceway
- Qualified person
Preparing for the journeyman exam too? The Texas Journeyman Electrician Exam Practice Pack has 1,000 practice questions and 10 timed two part mock exams. It is exam practice, not jobsite vocabulary or required employer training.
Are an outlet and a receptacle the same term?
OSHA defines them separately. An outlet is a point on the wiring system where current is taken to supply equipment. A receptacle is a contact device installed at an outlet for an attachment plug.
Does knowing a definition authorize me to do the work?
No. A glossary is not training or authorization. Follow your employer’s procedures and the directions of the person supervising the work.
