conduit 1

97問 • 1年前

Marcus Murphy

通報

問題一覧

kick

multiplier

90's

false

Two junction boxes are to be connected by a piece of 3/4-inch conduit. The distance between the boxes is 47 1/2 inches, and the conduit will have to be offset by 8 1/4 inches. If the conduit will be cut prior to bending, and the bends will be 22 1/2°, the length of the conduit will be ?.

49 1/16"

B and C

59 1/2"

add

false

true

The straightedge is held against the inside of each side of the bend.

rise

rise of the obstruction

a. and b.

true

a., b., and c.

true

center of the obstruction plus the shrink

Common types of electrical enclosures include ? and boxes.

cabinets

? is a type of threadable conduit with fairly thick walls that can be installed in most atmospheric conditions and occupancies.

Rigid metal conduit

A(n) ? box is installed at an endpoint in an electrical system where current is supplied to utilization equipment.

outlet

? is a threadable conduit that has a rubberized outside coating and is commonly installed in highly corrosive environments.

PVC-coated rigid metal conduit

A(n) ? box is also called a “handy box

utility

? provides an excellent ground path and it can be bent with virtually no springback

Aluminum conduit

Conduit bodies have a ? that is installed between the cover and the conduit body opening.

rubber gasket

A(n) ? box is also called a “J-box.”

junction

Couplings are used to ? .

join lengths of conduit to one another

? is a threadable conduit with an intermediate wall thickness compared to rigid metal conduit

Intermediate metal conduit

A(n) ? box typically houses switches and receptacles.

device

? is a non-threadable conduit that is lightweight and joined together using set-screw or compression fittings.

Electrical metallic tubing

Cutting with ? is a messy process because large amounts of debris from the conduit and blade are left behind.

abrasive saws

A(n) ? consists of a handle, grip, and head that remove the sharp edges on conduit.

reamer

The handles of a ? are opened and closed several times to provide a mechanical advantage, which can easily cut through thick-walled pipes.

ratchet cutter

? are manually-operated threading tools that require the arm strength of the Electrical Worker to turn the die around the conduit.

Hand-driven threaders

A ? is also called a “diestock.”

die head

A ? is a conduit threader in which the die head is secured to the threader in a fixed position.

non-ratcheting hand-driven threader

Threads for conduit fittings are straight without a taper.

True

The teeth on a ? are designed to efficiently cut plastic conduit with minimal heat build-up.

PVC saw

? is a non-threadable conduit that is rustproof and commonly available in Schedule 40 and Schedule 80 wall thicknesses.

PVC conduit

straight

benchmark

distance between the bends

Small-diameter conduits are typically bundled for shipment in groups of pieces.

5 or 10

electrical systems allow for efficient transmission of power over greater distances.

In 1903, an effective - process was developed and unlined steel conduit quickly became the industry standard.

electro-galvanizing

Rigid metal conduit (RMC)

color

Rigid nonmetallic conduit (RNC)

polyvinyl chloride (PVC)

rigid

conduit is a raceway of circular cross-section with an intermediate wall thickness designed for protection and routing of conductors.

Intermediate metal (IMC)

The most common type of non-steel metallic conduit is

aluminum

conduit is corrosion resistant, but extremely hard and very difficult to bend, cut, and thread.

Stainless steel

For PVC-coated conduit, any areas with should be repaired as soon as possible.

exposed metal

The three types of conduit given a PVC coating are bare steel, galvanized steel, and

zinc-coated steel

The most common color for PVC-coating is _

gray

Special tools used for handling PVC-coated conduit include tools, cutting and threading tools, and bending tools.

clamping

are present on couplings and fittings used for PVC-coated conduit.

Sleeves

A is a PVC heating tool containing an electric heating element within an enclosure that holds the heat.

hot box

The key to using a hot box is to keep the conduit in the enclosure.

turning

PVC-coated conduit can be cut with any conventional cutting tool, such as a _ or a saw.

rolling cutter

A is a tool used to cut threads in conduit that consists of dies, a die head, and one or more handles.

conduit threader

Common components of conduit threaders are dies and die heads, - -, and reamers.

oilers

A is a cutting tool used to form external screw threads in conduit.

die

Common types of vises are _ vises and chain vises.

yoke

A threader is a ratchet threader in which the entire die head can be replaced with another die head for different conduit sizes.

drophead

ratchet threaders are the simplest threaders to operate.

Hand-driven

NPT thread has a taper of _ " per foot of thread length.

3/4

A very convenient power vise accessory is a chuck, which allows for a nipple (a short piece of conduit) to be fabricated.

close nipple

Standard hand benders come in sizes that can bend ½/" to " EMT conduit.

1 1/4

is the property of conduit that causes it to unbend slightly after a bend is completed.

Springback

The bender is used to determine the front of the bender.

hook

is a hand bender with a no-radius shoe.

hickey

For a 90° stub-up bend, the. must first be subtracted from the desired stub length.

take-up

A(n) . bend is a 90° bend in conduit made perpendicular to the original length of the conduit.

stub-up

90° bends consist of two 90° bends fabricated on the same length of conduit.

Back-to-back

A(n) . bend is a double conduit bend with two equal angles bent in opposite directions in the same plane in a conduit run.

offset

A is a multiple bend in conduit where one of the bends is not in the same plane as the other bend.

dogleg

A(n) _ is a small offset bend used to move conduit away from a wall and into an electrical box.

box offset

The is the reduction in distance that a conduit can run per inch of offset elevation.

shrink constant

Electricians need to understand some in order to understand how to make the simple calculations required for conduit bending.

trigonometry

The _ method for offset bends is very popular and can be used whenever a bender is available that can bend angles accurately.

multiplier

is the amount by which the total run that conduit can cover is reduced because of the extra length required to bend around an obstacle.

Shrink

A dogleg occurs in an offset when the conduit has not been rotated exactly °from its position where the first bend was made.

180

The method of producing offsets does not require the electrician to fabricate conduit bends to a specific angle.

measured rise

A is a bend consisting of two offsets turned at a 90° angle from each other.

corner offset

The offsets for a four-bend saddle are made with the - pointing toward the center of the obstruction.

bender hook

The method of producing offsets does not require the electrician to fabricate conduit bends to a specific angle.

measured rise

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問題一覧

kick

multiplier

90's

false

49 1/16"

B and C

59 1/2"

add

false

true

The straightedge is held against the inside of each side of the bend.

rise

rise of the obstruction

a. and b.

true

a., b., and c.

true

center of the obstruction plus the shrink

Common types of electrical enclosures include ? and boxes.

cabinets

? is a type of threadable conduit with fairly thick walls that can be installed in most atmospheric conditions and occupancies.

Rigid metal conduit

A(n) ? box is installed at an endpoint in an electrical system where current is supplied to utilization equipment.

outlet

? is a threadable conduit that has a rubberized outside coating and is commonly installed in highly corrosive environments.

PVC-coated rigid metal conduit

A(n) ? box is also called a “handy box

utility

? provides an excellent ground path and it can be bent with virtually no springback

Aluminum conduit

Conduit bodies have a ? that is installed between the cover and the conduit body opening.

rubber gasket

A(n) ? box is also called a “J-box.”

junction

Couplings are used to ? .

join lengths of conduit to one another

? is a threadable conduit with an intermediate wall thickness compared to rigid metal conduit

Intermediate metal conduit

A(n) ? box typically houses switches and receptacles.

device

? is a non-threadable conduit that is lightweight and joined together using set-screw or compression fittings.

Electrical metallic tubing

Cutting with ? is a messy process because large amounts of debris from the conduit and blade are left behind.

abrasive saws

A(n) ? consists of a handle, grip, and head that remove the sharp edges on conduit.

reamer

The handles of a ? are opened and closed several times to provide a mechanical advantage, which can easily cut through thick-walled pipes.

ratchet cutter

? are manually-operated threading tools that require the arm strength of the Electrical Worker to turn the die around the conduit.

Hand-driven threaders

A ? is also called a “diestock.”

die head

A ? is a conduit threader in which the die head is secured to the threader in a fixed position.

non-ratcheting hand-driven threader

Threads for conduit fittings are straight without a taper.

True

The teeth on a ? are designed to efficiently cut plastic conduit with minimal heat build-up.

PVC saw

? is a non-threadable conduit that is rustproof and commonly available in Schedule 40 and Schedule 80 wall thicknesses.

PVC conduit

straight

benchmark

distance between the bends

Small-diameter conduits are typically bundled for shipment in groups of pieces.

5 or 10

electrical systems allow for efficient transmission of power over greater distances.

In 1903, an effective - process was developed and unlined steel conduit quickly became the industry standard.

electro-galvanizing

Rigid metal conduit (RMC)

color

Rigid nonmetallic conduit (RNC)

polyvinyl chloride (PVC)

rigid

conduit is a raceway of circular cross-section with an intermediate wall thickness designed for protection and routing of conductors.

Intermediate metal (IMC)

The most common type of non-steel metallic conduit is

aluminum

conduit is corrosion resistant, but extremely hard and very difficult to bend, cut, and thread.

Stainless steel

For PVC-coated conduit, any areas with should be repaired as soon as possible.

exposed metal

The three types of conduit given a PVC coating are bare steel, galvanized steel, and

zinc-coated steel

The most common color for PVC-coating is _

gray

Special tools used for handling PVC-coated conduit include tools, cutting and threading tools, and bending tools.

clamping

are present on couplings and fittings used for PVC-coated conduit.

Sleeves

A is a PVC heating tool containing an electric heating element within an enclosure that holds the heat.

hot box

The key to using a hot box is to keep the conduit in the enclosure.

turning

PVC-coated conduit can be cut with any conventional cutting tool, such as a _ or a saw.

rolling cutter

A is a tool used to cut threads in conduit that consists of dies, a die head, and one or more handles.

conduit threader

Common components of conduit threaders are dies and die heads, - -, and reamers.

oilers

A is a cutting tool used to form external screw threads in conduit.

die

Common types of vises are _ vises and chain vises.

yoke

A threader is a ratchet threader in which the entire die head can be replaced with another die head for different conduit sizes.

drophead

ratchet threaders are the simplest threaders to operate.

Hand-driven

NPT thread has a taper of _ " per foot of thread length.

3/4

A very convenient power vise accessory is a chuck, which allows for a nipple (a short piece of conduit) to be fabricated.

close nipple

Standard hand benders come in sizes that can bend ½/" to " EMT conduit.

1 1/4

is the property of conduit that causes it to unbend slightly after a bend is completed.

Springback

The bender is used to determine the front of the bender.

hook

is a hand bender with a no-radius shoe.

hickey

For a 90° stub-up bend, the. must first be subtracted from the desired stub length.

take-up

A(n) . bend is a 90° bend in conduit made perpendicular to the original length of the conduit.

stub-up

90° bends consist of two 90° bends fabricated on the same length of conduit.

Back-to-back

A(n) . bend is a double conduit bend with two equal angles bent in opposite directions in the same plane in a conduit run.

offset

A is a multiple bend in conduit where one of the bends is not in the same plane as the other bend.

dogleg

A(n) _ is a small offset bend used to move conduit away from a wall and into an electrical box.

box offset

The is the reduction in distance that a conduit can run per inch of offset elevation.

shrink constant

Electricians need to understand some in order to understand how to make the simple calculations required for conduit bending.

trigonometry

The _ method for offset bends is very popular and can be used whenever a bender is available that can bend angles accurately.

multiplier

is the amount by which the total run that conduit can cover is reduced because of the extra length required to bend around an obstacle.

Shrink

A dogleg occurs in an offset when the conduit has not been rotated exactly °from its position where the first bend was made.

180

The method of producing offsets does not require the electrician to fabricate conduit bends to a specific angle.

measured rise

A is a bend consisting of two offsets turned at a 90° angle from each other.

corner offset

The offsets for a four-bend saddle are made with the - pointing toward the center of the obstruction.

bender hook

The method of producing offsets does not require the electrician to fabricate conduit bends to a specific angle.

measured rise