Grounding & Bonding
Joining conductive metal parts to establish electrical continuity is called this.
What is bonding?
A short conductor used to connect a device to a splice is commonly called this.
What is a pigtail?
Two bends in opposite directions that shift a conduit run while keeping its ends parallel form this.
What is an offset?
This general term includes both excessive load current and short-circuit current.
What is overcurrent?
Before changing a blade in a corded saw, remove this source connection so the tool cannot start unexpectedly.
What is unplug the saw?
A conductor connecting the grounding electrode system to the designated system grounding point has this name.
What is a grounding electrode conductor (GEC)?
The removable protective panel that prevents ordinary access to energized panelboard parts has this common name.
What is a dead front?
A slight twist between the planes of an offset produces this common bending defect.
What is a dogleg?
A breaker's ampere rating and this fault-current rating describe different limits; this rating tells how much fault current it can safely interrupt at its rated voltage.
What is its interrupting rating?
A drill bit can catch in metal and spin the tool body. Use this manufacturer-provided attachment when required to improve control.
What is the auxiliary or side handle?
In a new feeder-supplied panel in the same building, the neutral bar normally must be isolated from this metal part.
What is the panel enclosure? (Keep the equipment grounding bar bonded to the enclosure.)
The vertical section of a conduit run is commonly described by this term.
What is a riser?
Using a 30-degree offset multiplier of 2, a 6-inch offset requires this spacing between bend marks.
What is 12 inches? (6 x 2.)
A circuit breaker intended to tolerate brief motor starting current uses this characteristic rather than tripping instantly on every small overload.
What is a time-current trip characteristic?
A grinding wheel is marked for a maximum 6,000 rpm, while the grinder runs at 10,000 rpm. This is the correct selection decision.
What is do not use that wheel; select a compatible wheel rated for at least the grinder's operating speed?
An improper neutral-to-ground connection in a downstream panel can put normal return current on these unintended conductive paths.
What are equipment grounding conductors, metal raceways, and other bonded metal paths?
Drawings updated to show the actual installed circuit routes and field changes have this common name.
What are as-built drawings or record drawings?
A bender has a verified 6-inch take-up. For a 24-inch stub using its arrow method, place the mark this far from the conduit end.
What is 18 inches? (24 - 6; follow that bender's instructions.)
This protection strategy aims to open only the protective device nearest a fault while leaving upstream devices closed.
What is selective coordination?
After drilling overhead, debris could enter your eyes around ordinary spectacles. Use this type of task-appropriate eye protection.
What are properly rated safety goggles or safety glasses with appropriate side protection, as the hazard assessment requires?
A 120-volt line-to-case fault can return through either a 1-ohm metallic path or a 25-ohm earth path. Considered separately and ignoring other impedance, these are the two fault currents.
What are 120 amperes and 4.8 amperes? (I = V / R; earth alone is not a reliable fault-clearing path.)
The engineer issues a revised drawing after rough-in. Before continuing, compare its revision identifier and scope against this controlled set at the jobsite.
What is the current approved construction drawing set?
Using a 30-degree multiplier of 2 and shrink allowance of 1/4 inch per inch, an 8-inch offset needs these two layout values: mark spacing and total shrink allowance.
What are 16 inches between marks and 2 inches of shrink allowance?
Two breakers are both marked 20 amperes. This information must also be checked before substituting one for the other on a 480-volt circuit.
What are the voltage rating, interrupting rating, and suitability/listing for the equipment and application?
An extension ladder has 20 feet of working length from its foot to the top support. Using the 4-to-1 rule, place the foot approximately this far from the support.
What is 5 feet?