The clearance distance between a phase conductor and earth is determined by safety standards and regulations, and varies depending on factors like voltage level and environmental conditions. It is crucial to maintain adequate clearance to prevent electrical flashovers and ensure the safety and reliability of the electrical system. Typically, minimum clearance distances are specified in codes such as the National Electrical Safety Code (NESC) or relevant local regulations.
In 32 years of commercial electrical work, I have never seen a clearance specification for phases in a 480V, high volt panel. I have never seen it adressed in the N.E.C. (electrical code). Main lug clearance is typically 3 to 6 inches depending on size (amp rating) of the panel. Some manufacturers install a dialectric material (insulator) between main phase lugs allowing closer clearance. Underwriters Labratories which approves and tests all electrical equipment sold in the U.S. may have specs for clearance. Note that the clearance between breaker busses of different phases in 480V panels is often only a few inches. Again here, many maufacturers install a dialecric shield between buss phases.
Phase to phase clearance is the distance between phase conductors a person must stay. If someone is working on one phase conductor, they cannot get closer than the phase to phase clearance to another phase conductor.
AnswerThere is no such thing as a 'phase conductor', so you are actually referring to 'line' conductors. The spacing between line conductors of separate circuits depend on the operating voltages of the two circuits, so there is no one simple answer. These distances will be laid out in the utility company's standards manual based on national electrical standards.
A clearance is defined as shortest distance through the air between two conductive elements.
Practically all generators and many motors and high-power motors have 3 power conductors: the 3 phase wires.
Many also have a 4th "ground" or "earth" wire.
It is important to keep the physical distance (typically measured in inches or mm) between any one phase conductors and any other phase conductor, and between any one phase conductor and anything else (such as the earth conductor) big enough so that
(a) the normal voltage between the conductors should not cause a spark to arc between them, and
(b) the common surges of voltage caused by distant lightning strikes should not cause a spark to arc between them.
Many systems deliberately put the ground conductor relatively close to each phase conductor through a glow-discharge tube or other lightning arrester, such that
(c) the surge of voltage on a phase conductor, caused by nearer lightning strikes, causes an arc to the safety ground through the arrestoer and dissipates most of the energy relatively harmlessly.
See the related links for some information on how big those clearances should be.
phase to phase implies: voltage measuring between two lines at different voltages
while latter implies:" b/n one line to ground at zero potential"
If the Moon is between Earth and the Sun, it is not a phase, at all . . . it is a solar eclipse.
New moon.
The new moon phase occurs when the moon is positioned between the Earth and the Sun, with the side of the moon that is illuminated facing away from us and appearing dark. This phase marks the beginning of the lunar cycle and is not visible from Earth.
Full Moon.
During a solar eclipse, the moon phase is a new moon. This is when the moon is positioned directly between the Earth and the Sun, casting a shadow on Earth and causing an eclipse.
When dealing with a 3 phase power supply the safe clearance zone between each phase is usually within an arms reach, there are exceptions to this rule like a 3 phase socket or a distribution board.
If the Moon is between Earth and the Sun, it is not a phase, at all . . . it is a solar eclipse.
Your question should read, 'How much clearance is needed between LINES.... (not 'phases')?' The answer will depend on local authority regulations. The clearances in air tolerated by REC companies in the UK is 90 mm line to line and 127mm phase to earth. Even though there is a greater potential difference between line to line, the gap is less. I think it's to do with public safety if it flashes to earth.
Phase to phase clearance should be around 11.5 inches.
The clearance between 33-kV line (not 'phase'!) conductors depends on whether they are rigid (e.g. busbars) or can move (e.g. overhead lines); whether they are insulated or in air; etc.. So there are several 'clearance' distances. All are published on the internet -so you can do a search to find out for yourself.
1.2 meter
Insulation.Can be air (as in overhead powerlines) or a non conducting material ( as in a power cord)AnswerPresumably, you are asking what the clearance is between two conductors? If so, then it depends on the voltage between them; the higher the voltage, the greater the clearance must be.
full moon
New moon.
new moon
an eclipse not an ellipse
New moon.