MEP MIDTERM AND FINAL EXAM ACTUAL

MEP MIDTERM AND FINAL EXAM (ACTUAL / )

QUESTIONS AND VERIFIED ANSWERS .

UF Cable - ----Answers----Underground Feeder -Flame Resistant -Water Resistant -Corrosion Resistant

Flexible Conduit - ----Answers----Commonly called Armored Cable

• Made of self-interlocked ribbed strips of aluminum or steel

-Great for retrofit or change order work

Electrical Metallic tubing (EMT) - ----Answers----Commonly Called thin Wall conduit

• 1/2-4" conduit
• Most common conduit in commercial buildings

-Steel

Galvanized Rigid Conduit (GRC) - ----Answers---- Similar to EMT but is thicker and has threaded fittings

• Used in explosive or wet environments
• Typically used in 4" or larger where EMT is not allowed

-Steel

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Intermediate Metal Conduit (IMC) - ----Answers---- A lighter rigid Steel Conduit -Thinner Wall than GRC

• Steel

BIM Modeling - ----Answers----Building Information Modeling

Conduit Fill Capacity - ----Answers---- About 40% of conduit opening can be filled up Why? - Heat buildup, break down insulation, can potentially cause fire

PVC - ----Answers---Used in -Concrete -Underground

Electrical Nonmetallic Tubing (ENT) - ----Answers----AKA smurf tube

• Is used indoors and walls

-Can transition to metal tubing

Raised Flooring - ----Answers----Commonly Called Access Flooring -Used in Computer Rooms -Easy to reconfigure room so its considered a green product 2 / 4

-Can be used in lieu of ductwork

Wiremold - ----Answers----Surface Mount metal Race Ways -Used for Retrofit Applications -Commonly Metal or Plastic -Not very aesthetically pleasing

Direct Electrical Injuries - ----Answers----Burns -Electrical Shock -Electrocution or death due to electrical shock

Indirect Electrical Injuries - ----Answers----Falls -Fire

Severity of Shock Depends on: - ----Answers----Path of

Current Through Body -Amount of current flowing through body (amps) -Duration of shocking current through body

****** Low voltage does not mean low hazard

94% of Electrical Distribution Systems fires were Caused by - ----Answers---Faulty Fixed Wiring

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Faulty Fixed Wiring - ----Answers----poor/loose splices, damaged connectors, improper installation and ground faults

Grounding - ----Answers----Connected to the earth at the point of lowest intentional voltage -Protects system and equipment from overvoltage

• Protects People from Accidental Shock

Grounding Methods - ----Answers----Ground connect to water pipes(assuming they are metal) -Grounding Rod -Grounding Grid Underslab

Circuit Breakers - ----Answers----Designed to prevent over current or short circuit -Sized by amperage, "breakers" are identified by the circuits amp requirements

• 15-20amp is Plugs and Lights
• 30-60amp is stove or HVAC

Ground Fault Circuit Interrupter (GFCI) - ----Answers---- Detects an imbalance of current flow from hot to neutral legs -Reacts faster than circuit breaker (1/30th of second) -Required in wet locations

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