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IMSA Traffic Signal Level 1
MUTCD - correct answer ✔Part 4 OSHA - correct answer ✔Safety Date Sheets (SDS) - 16 sections NEC - correct answer ✔National Electric Code, smaller (house, cabinet) NESC - correct answer ✔National Electrical Safety Code, bigger (utilities) NEMA - correct answer ✔National Electrical Manufacturers Association IMSA - correct answer ✔International Municipal Signal Association ATCC - correct answer ✔Advanced Transportation Controller Cabinet ATC - correct answer ✔Advanced Transportation Controller Tort Law - correct answer ✔Legal situations where an individual could be held liable for an injury inflicted upon another person. Also involve the injured party seeking compensation for any damages they have experienced (property loss, physical harm or pain and suffering). Negligence - correct answer ✔Failure to use reasonable care in one's actions
Class 00 Gloves - correct answer ✔Max 500 volts AC, 750 DC, tested semi annually Class 0 Gloves - correct answer ✔Max 1000 volts AC, 1500 DC, tested semi annually Class 1 Gloves - correct answer ✔Max 7500 volts AC, 11250 DC, tested quarterly Class 2 Gloves - correct answer ✔Max 17000 volts AC, 25500 DC, tested quarterly Class 3 Gloves - correct answer ✔Max 26500 volts AC, 39750 DC, tested quarterly Class 4 Gloves - correct answer ✔Max 36000 volts AC, 54000 DC, tested quarterly Power line clearance (OSHA) - correct answer ✔minimum 10 feet Power Pole Construction - correct answer ✔highest voltage lines at top of pole, communications lines lowest on pole Risers - correct answer ✔used on poles as overhead utilities may transition to become underground utilities Arc Flash - correct answer ✔Electrical explosion with a tremendous amount of heat and pressure. Everything turns into molten metal upwards of 35000 degrees.
TDR/OTDR - correct answer ✔measures anomalies in a wire or optical fiber Megohmmeter - correct answer ✔measures conductor insulator resistance Loop Tester - correct answer ✔measures inductance and frequency Ground Rod Tester - correct answer ✔measures resistance to ground Voltage tester (loaded) - correct answer ✔looks for voltage on a conductor Tone generator - correct answer ✔places an audible signal on a conductor to locate BIU - correct answer ✔bus interface unit Common Conductor materials - correct answer ✔metals, copper, aluminum Common Insulator materials - correct answer ✔plastics, rubber, glass, porcelain, ceramic Voltage - correct answer ✔like water pressure, Volts current - correct answer ✔like amount of water flowing, Amps resistance - correct answer ✔like size of pipe, Ohms
power - correct answer ✔amount of energy consumed, Watts Ohms Law - correct answer ✔E (voltage) = I (current) x R (resistance), P (power) = I x E AC - correct answer ✔Alternating current AC is the type of electricity that powers our homes businesses and factories and our traffic signals. It is generated by various types of generators and distributed through the power grid. It is typically 120 volts and alternates at 60 cycles per second (60 Hertz) DC - correct answer ✔Direct Current DC is produced by batteries or power supplies. Electronic circuits and devices run on DC. Typical voltages used in electronics are 5 Volts, 12 Volts, and 24 Volts. Series formulas - correct answer ✔E(total) = E1 + E2 + E ... R(total) = R1 + R2 + R .... P(total) = P1 + P2 + P ... Parallel Formulas - correct answer ✔I(total) = I(branch 1) + I(branch 2).... R(total) = 1/sum(1/Rx) P(total) = P1 + P2 + P ... Bonding - correct answer ✔connected to establish electrical continuity and conductivity. Bonding metal parts, such as enclosures and raceways, ensures that they are all continuous on an effective ground-fault current path (EGFCP) that references back to ground (earth). Schematic diagram - correct answer ✔map of electrical circuits that uses standardized symbols to show how electricity flows through the circuit
Ring - correct answer ✔A ring consists of two or more sequentially timed and individually selected conflicting phases so arranged as to occur in an established order Barrier - correct answer ✔A reference point in the preferred sequence of a multi ring controller in which all rings are interlocked Fully actuated - correct answer ✔detection is provided to all phases at an intersection semi actuated - correct answer ✔detection is provided to the phases controlling the minor movements and the left turn movements at an intersection 6 Basic types of Cabinets and Controllers - correct answer ✔1. electrical mechanical
- pre NEMA
- NEMA TS
- NEMA TS
- CALTRANS 170/179/
- ATC Serial Interface Unit (SIU) - correct answer ✔Used in ATC cabinets to facilitate communication and data exchange between the controller and other devices in the cabinet. Back Panel - correct answer ✔includes the field terminals, the load switch bay, the flasher(s), the FTR's, and in some cases, the input/output terminals, and the power distribution components
Power Panel - correct answer ✔include the power distribution equipment responsible for distributing power throughout the cabinet Detection Panel - correct answer ✔facilitate the detection inputs from the field and interface them into the controller Telemetry panel - correct answer ✔facilitates communications between the controller and a TOC or other system Preemption Panel - correct answer ✔Facilitates the EV and RR preemption inputs from the field and the controller Main breaker rating - correct answer ✔30 amps Auxiliary breaker rating - correct answer ✔15 amps Ground Fault Circuit Interrupter (GFCI) - correct answer ✔protect devices and workers from electrical shock Cabinet temperature - correct answer ✔85-165 degrees UPS/Battery Backup System - correct answer ✔(Uninterrupted Power Supply) provides temporary power to the traffic signal cabinet in case of a power outage. Types of rigid metallic conduit - correct answer ✔GRG (galvanized rigid conduit), IMC (intermediate metallic conduit), EMT (electric metal tubing)
Horizontal distance must be maintained from the face of curb for side of pole mounted signal heads mounted less than 15' vertically? - correct answer ✔2' Types of lighting luminaires - correct answer ✔incandescent, high intensity gas discharege (HID) Key parts of street light - correct answer ✔lamp, ballast, photocell Ped pole height - correct answer ✔8-16 feet ped head height - correct answer ✔7-10 feet PROWAG - correct answer ✔Pedestrian Right Of Way Accessibility Guidelines Audible walk indications volume - correct answer ✔louder than ambient sounds up to 5 dBA louder than ambient sound Ped button height - correct answer ✔3.5-4 feet ADA vertical reach limit for ped buttons - correct answer ✔15-48 inches ADA horizontal reach limit for ped buttons - correct answer ✔10" Ped button proximity - correct answer ✔no more than 5 feet from side of curb ramp
Average walking speed - correct answer ✔3.5 feet per second (up to 4) RRFB - correct answer ✔Rectangular Rapid Flashing Beacon HAWK - correct answer ✔High intensity actuated cross walk
