ELECTRICAL- FINAL EXAM QUESTIONS WITH COMPLETE ANSWERS (RATED A+)

ELECTRICAL- FINAL EXAM QUESTIONS WITH COMPLETE ANSWERS (RATED A+) NEC - Answer-The National Electrical Code, which regulates the manner of installation and the types of wires and cables for various electrical applications. Wire Lettering - Answer-The letters THHN, THWN, THW and XHHN represent the main insulation types of individual wires. T (wire lettering) - Answer-Thermoplastic insulation H (wire lettering) - Answer-Heat resistance HH (wire lettering) - Answer-High heat resistance (up to 194°F) W (wire lettering) - Answer-Suitable for wet locations N (wire lettering) - Answer-Nylon coating, resistant to damage by oil or gas X (wire lettering) - Answer-Synthetic polymer that is flame-resistant Triplex Wires - Answer-An electrical cable composed of two insulated aluminum wires wrapped with a third bare wire which is used as a common neutral. Main Feeder Wires - Answer-Main power feeder wires are the wires that connect the service weather head to the building. Should be rated for 25% more than the actual load. Weather head - Answer-Connection point on building that is used to electrically connect the building to the utility. Panel Feed Wires - Answer-Electric wires used to power the main junction box and the circuit breaker panels. Should be rated for 25% more than the actual load. Non-Metallic Sheathed Wires - Answer-2-3 conductor wire used for instrumentation. Wire gauge - Answer-The size of the wire. Ampacity - Answer-The amount of electric current that can flow through a wire. Wattage - Answer-The load a wire can take.