On an electrical plan, what does the symbol showing a circle with the letter 'J' inside represent?
Correct Answer
A) Junction box
A circle with the letter 'J' inside is the standard electrical symbol for a junction box. Junction boxes are used to house electrical connections and are typically mounted in walls, ceilings, or accessible locations.
Why This Is the Correct Answer
A circle with the letter 'J' inside is the standardized electrical symbol for a junction box according to electrical drawing conventions. Junction boxes are enclosures that house electrical connections, splices, and wire joints. They provide protection for electrical connections and allow access for maintenance. This symbol is universally recognized in electrical plans and specifications across the construction industry.
Why the Other Options Are Wrong
Option B: Electrical panel
Telephone outlets are represented by different symbols, commonly a circle with 'TEL' or 'T' inside, or sometimes a square symbol. The letter 'J' specifically designates junction boxes in electrical symbology, not telecommunications equipment. Phone outlets have their own distinct symbol set.
Option D: Emergency light
Emergency lights are typically shown with specialized symbols that indicate their emergency function, often including battery backup notation or specific emergency lighting designations. A simple circle with 'J' does not convey the critical safety function that emergency lighting symbols must clearly communicate on plans.
Memory Technique
Remember 'J for Junction' - the circle represents the round electrical box, and 'J' stands for Junction where wires join together.
More Project Mgmt Questions
What is the minimum R-value required for wall insulation in Florida Climate Zone 2?
A subcontractor brings a new chemical product to your jobsite. Under the Globally Harmonized System (GHS), what information must be immediately available to workers?
A construction site has a trench that is 8 feet deep in Type B soil. What is the maximum allowable slope ratio for the trench walls without protective systems?
What is the maximum recommended spacing between drywall screws when attaching to wood studs?
Your crew discovers suspected asbestos-containing materials during a renovation project. What is the first action you should take?
A scaffold platform is 12 feet long and 5 feet wide. If the maximum load capacity is 25 pounds per square foot, what is the total weight capacity of this platform?
Which CSI MasterFormat Division would contain specifications for fire-stopping and firesafing materials?
In tilt-up concrete construction, what is the primary advantage of this method over conventional cast-in-place construction?
Which OSHA standard specifically addresses construction industry safety and health regulations?
A structural drawing shows a beam labeled 'W12x26'. What does the '26' represent?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass