Commercial Electrical Wiring Exam Questions with Complete Solutions Latest Update

Commercial Electrical Wiring Exam Questions with Complete Solutions Latest Update __________is a lightweight tubular raceway without threads on each end. - Answers EMT Conductor fill cannot exceed ______% in underfloor raceways. - Answers 40 RMC must be securely fastened at a maximum of every ____ feet. - Answers 10 FMC must be securely fastened _______ inches away from a box, conduit body, or panel. - Answers 12 Most non metallic raceways are made of __________. - Answers PVC _______ is an enclosed channel for routing and placing conductors and cables. - Answers raceway Conduit nipples have a maximum fill rate of _____% of their cross sectional area. - Answers 60 What is the maximum distance conduit must be supported from a box, panel, or conduit body unless there is an exception? - Answers 3 ft A___________ is a raceway and is used between a junction box and a luminaire( fixture) and is flexible to allow for moving and vibration. - Answers fixture whip _______________ conductors are two or more conductors that are electrically connected at each end to form a single conductor. - Answers paralleled The nominal inch-based designation used to identify the size of conduits is called the ______ ________. - Answers trade size A(n)__________bend is a double conduit bend with two equal angles bent in opposite directions that are used to make a change in elevation in a conduit run. - Answers offset FMC is safe for use as a EGC(equipment grounding conductor) - Answers false wire ways can be concealed - Answers false Conductor fill is the total amount of conductors allowed in a raceway and may have different ranges of fill depending on the number of conductors and the insulation rating of those conductors. - Answers true Jamming can occur when conductors become twisted and are pulled through a bend in conduit. - Answers true Metal raceways cannot be used as an ECG. - Answers false IMC has a thicker conduit wall the RMC - Answers false To properly bond sections of cable tray a bonding jumper must be installed. - Answers true all bonding jumpers must be insulated - Answers false A _______ is a metal component that contacts earth and has a conductor connected to it. - Answers grounding electrode When installing service disconnects, they must be grouped together with no more than ____ in one location. - Answers 6 Mechanical grounding connectors are typically made of high-______ alloy. - Answers copper A(n)___________is an electrical conductor used to connect non current carrying metal parts of equipment or enclosures to the system grounded conductor or grounding electrode conductor. You Answered - Answers equipment grounding conductor A(n)_________is the winding of a transformer that gets power from the source. - Answers primary winding ____________ are designed to raise, lower, or isolate voltage in electrical distribution systems. - Answers transformers A battery system that is used for standby and emergency power is called a__________. - Answers UPS A_______________ is a service conductor that is installed underground from a transformer to a building. - Answers service lateral In addition to the equipment grounding , _______and _______are also used to protect against ground faults. - Answers fuses , circuit breakers Examples of separately derived systems include, _____, solar voltaic systems, generators, and transformers. - Answers batteries _____________ transformers isolate the power circuit of a control circuit , providing additional safety to the circuit operator. - Answers control _____________ transformers isolate the power circuit of a control circuit , providing additional safety to the circuit operator. - Answers 90,110 The connection from the equipment grounding conductor to the grounding electrode is called the______________. - Answers main bonding jumper the insulation rating for most conductors with a circuit voltage of 480 volts is typically rated at _________volts. - Answers 600 Bonding methods are used to protect personnel and equipment from __________. - Answers ground fault conditions A typical__________ ignites powdered copper-oxide and aluminum to produce a heat reaction. - Answers exothermic welding process Electrical service meters measure energy in watts(W). - Answers false In certain applications and conditions transformers can be suspended from a ceiling. - Answers true Because of the large number of loads in commercial and industrial settings, separately derived systems cannot be used for back-up power. - Answers false A grounded conductor is commonly called a neutral conductor. - Answers true A service lateral is a conductor that runs overhead from the transformer to the meter. - Answers false Equipment grounding conductors are permitted to be bare or insulated. - Answers true Liquid filled transformers are typically used in high-voltage applications. - Answers true A combustible material is a material that is subject to easy ignition and capable of rapid flaming. - Answers true A__________________ is a non permanent installation of electrical lighting and power during the construction or remodeling of a building. - Answers temporary wiring installation When building a temporary service for construction the NEC rules do not apply to grounding and bonding since this is nonpermanent. - Answers false The ________ determines whether an area needs to be classified as hazardous areas. - Answers NEC The local grain elevator has a dump pit for grain where trucks typically unload. This are has significant amounts of grain dust in normal working hours. What is this are a classified per the NEC? - Answers class 1 div 1 What type of seal would be used to isolate atmospheric hazards from certain electrical aparatuses? - Answers conduit seal ____________ must be installed for the protection of conductors to minimize the the damage from sharp edges when installing generators. - Answers bushings The NEC has different rules that apply to health care facilities for bonding and grounding as opposed to standard commercial construction. - Answers true A ________________ is a system for the production of energy from a source that is not depleted. -