0
Minimum Annular Ring; PWB Internal Via
Both diagrams indicate minimum annular ring measured from the outside ring of the pad and to the inside diameter of the plated thru-hole for an external pad [below], or to the center of the plated via for an internal pad [above].
Minimum Annular Ring; PWB External Pad
Minimum Annular Ring applies regardless of the shape of the PCB pad. The next page shows two examples of different pad shapes.
More Printed Wiring Board Terms
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
Why do you use a 30amp breaker on a ring circuit and a 20 amp on a radial circuit?
Answer for UK, Europe and countries running a 50 Hz supply service.A ring circuit has two routes to each outlet, a radial has only one.
WHAT ARE THE RATING OF RING MAIN UNIT?
The normal rating of a UK ring circuit in a domestic system using 2.5 mm2 cable in a ring is 30 amps.
A branch from a ring final circuit is usually described as a?
Spur
What is the difference between a ring circuit and a radial circuit?
It as simple as the name implies ring circuit ,it 's in the circular form that is from the panel to the outlet and back to the panel . While radial is from the panel and stop at the out let without going back to the panel.But note that in a ring circuit you must use 6mm cable and 32/30 amp fuse rated.AnswerRing-main circuits must be wired using 2.5-mm2 cables, not 6-mm (whatever that is) cables.
What do you mean by package substation?
Prefabricated power distribution substation Its basically a whole 11kv substation but in one unit. It contains a transformer, ring main unit, fuse board and circuit breakers etc. It still uses as much space as a normal substation that houses a separate transformer, ring main unit etc but is easier to transport and is probably cheaper.
What is the definition of annular in dermatology?
Annular means like a ring, or round in shape. Several things in dermatology cause annular rashes.
What is an annular zone?
An annular zone is a ring of fibres on the stem of a mushroom that is not well enough defined to be an annulus.
What an annular eclipse?
An annular eclipse is a solar eclipse in which the thin outer disc of the sun can be seen as a ring around the moon.
What finger do doctors call your annular finger?
Ring finger
Where are both parallel and series circuits used?
there are both used in some electronics eg circuit breakers,ring main unit,circuit board.
What is a solar eclipse that leaves a ring around the sun?
An annular eclipse.
What is the ring around a full solar eclipse called?
This type of eclipse is called an "annular eclipse" and the ring is an "annulus".
What is the function of annular ring in the eye?
papilla constrictor muscle of iris diaphragm
What is annularia when used as a medical term or disease?
It describes someting ring-shaped (annular).
When a thin solar ring is visible around the edge of the moon is what?
This is seen during an "annular eclipse".
What does posterior annular fissure mean?
There's a slit in the back of the ring that holds the vertebral disk.
Why homo annular diene is having more lambda max than hetero annular diene?
Because in homo-annular ring distance between C1 and C4(of butadiene structure in it) is less compare to C1 and C4 of heteroannular.So, in Homo-annular more overlap of pi system, more conjugation, more lamda max.
