Energy Retrofit Training - Study Guide Day 4

Color code for a 277 v

Brown, orange and yellow

Ladder Safety

shunted vs non shunted

Shunted sockets have internally connected contacts acting as a single terminal
non-shunted sockets have separate, unconnected contacts for each wire

Electrical pressure

Also called electromotive force; measured in volts.

Conductors

Materials that have free electrons and can carry electrical current.

What does phosphorus have?

has an abundant free electron

Electrical Power

Measured in watts.

Ohm's Law

Law stating that resistance can be calculated by dividing voltage by amperage.

Standard circuits for residential lighting

Typically should be on 15 amp circuits.

Minimum gauge wire for residential lighting circuits

14 gauge.

De-lamp

A retrofit that reduces the number of tubes in a fixture.

what is a dedicated circuit

an electrical line, directly connected to a single, specific breaker in your service panel, that powers only one appliance or outlet.

When are four way switches used?

to control lights or receptacles from three or more separate locations

What does a single pole switch do?

to turn a single electrical circuit on or off from one location

Re-lamp

Replacing an inefficient bulb with an LED bulb.

Exterior lighting fixture may have what on them?

Fixture like a wall pack that may include a motion detector and photo cell.

What is the main job of a GFCI?

protect people from electrical shock

Electrical Metallic Tubing (EMT) conduit

a lightweight, galvanized steel, thin-walled, and rigid raceway used to protect electrical wiring in commercial, industrial, and residential applications.

Stairway lighting rule

Lighting must have a 3-way switch located at the bottom and top of each stairway.

Resistance and amperage relationship

As resistance goes up, amperage drops.

fluorescent tubes sizes

259,568 Watts in kilowatts is?

259.568 kilowatts

Return wires in a 4 tube ballast

yellow wire

A bright white light that’s a High Intensity Discharge light type

Metal halide

Wiring in AC light circuits

Should be wired in parallel.

arc fault flash, arc flash or arc blast =

a low-impedance fault or dead short

GFCI required in what type of areas?

residential areas with water sources or high moisture

Arc fault

Not a dead short circuit; it is a fault detection.

LED driver function

Steps voltage down, converts A/C to D/C, and protects the lamps.

How many amps does it take to kill you?

Less than half an Amp

Safety priority during lighting retrofits

Always verify the power is off.

Examples of a Source and Load Circuit

Source is what is giving the power
Load is what is using the power

4 factors of resistance

length
material
cross section
temperature

What wiring color is needed for a 208v 3 phrase

Black, Red and Blue

Three types of high intensity discharge lights?