277 480 volt ac wire color codes.
Typical 120 208 voltage colors.
The wire color codes followed in usa for ac supply may be categorized in three sub categories depending on the nature and range of ac supply.
Blue phase 3.
In larger facilities the voltage is 277 480 volt and used to power single phase 277 volt lighting and larger hvac loads.
Phase a 120v black phase b 208v wild leg high phase orange phase c 120v blue there are other color.
This all stems from the nature of 208v power and how it is affected by transformers.
The most common commercial building electric service in north america is 120 208 volt wye which is used to power 120 volt plug loads lighting and smaller hvac systems.
In the united states the following color codes are typically used for power wires in branch circuits the wiring between the last protective device such as a circuit breaker and the load such as a tool or appliance.
120 208v single phase power.
120 208 240 volt ac wire color codes.
208 197 6 218 4 181 220 5 200 180 220 240 228 252 208 9 254 4 230 207 253 277 263 2 290 9 241 293 6 480 456 504 417 6 508 8 460 414 506 bandwidth bandwidth bandwidth 10 19 20 utilities actively regulate distribution voltages slowly by means of tap changing regulators and.
White or with 3 white stripes neutral.
120 208 240 volt ac wire colors.
For wires that will be 120 208 or 240 volts the following wiring color standards are used.
Black phase 1.
Ac power 120 208 240 volts ac power comes in many different types based on how many volts the wires will be carrying.
Assuming you are talking about a 120 240v delta system the color coding is as follows.
120 208 240 volt ac wiring color codes in usa.
120 208v single phase is derived from 208v three phase power.
Typical power wiring color codes.
Each one is 120 degrees behind the next.
Dc supply wire color codes.
The conductors between a voltage source and a load are called lines and the voltage between any two lines is called line voltage the voltage measured between any line and neutral is called phase voltage.
Red phase 2.
For example for a 208 120 volt service the line voltage is 208 volts and the phase voltage is 120 volts.
If viewed on an oscilloscope the three voltage waveforms on the three hot conductors all peak at different times.
These systems are common in home and office.
The incoming 240v power is split into two legs.
In western canada 347 600v is common.
Each leg can provide 120v hot to neutral and the two legs together will supply 240v which is used to supply heavy loads such as air conditioning compressors and cookstoves.
It is important to note that with this type of wiring there are multiple phases in place each of which will get its own color wire.
