Module 26205 Electrical level 2: Pull and junction boxes

A shielded cable with an OD of 50MM enters a junction box with an angled pull. Assumming the system operates at 5,000 , the min length of the box should be

1,800 example: Must be at least 36 times the OD of the entry point. Equation: 36*50mm= 1,800

An MD 53 raceway runs alongside an MD 78 raceway into a junction box with an angled pull. Assuming the system operates at 600V; the required distance between these two raceways entries are?

521

For Raceway conductors of number 4 gage wire or larger in u-pulls and angle pulls Under 1,000 Volts

6 Times the largest trade diameter plus the next largest trade diameter.

A 2" raceway runs along a 3" raceway into a junction box with an angled pull. Assuming the system operates at 600V, the required distance between these two raceways entries is

6 times the largest diameter 3" plus the next largest diameter (plus 2")= 20"

A shielded cable with an OD of 2" enters a junction box with an angled pull. Assumming the system operates at 5,000 volts the min length of the box is

72" example: Must be atf least 36 times the OD so equation: 36*2=72"

Entrance Ells

Built with an offset so that it can be attached directly to the surface. A cover of the back of the SLB permits wire to be pulled out and reinserted.

a receptacle in a wet locations would most likely be installed in an

FS Box

IP Classification system: First Number

Level of protection from solid objects

Trade sixe of conduit* 8=

Minumium length in the box

Where in the NEC will you find the most information on pull and junction boxes?

NEC Article 314

An enclosure for use in an area subjected to regular washdown is

NEMA type 4: water tight

Any underground conductor that enters a raceway, box or enclosure must be protected from abrasion if it is

Number 4 gage wire and larger

A handhole enclosure must be

Provided with a cover that weighs over 100 lbs or requires tools to open.

The distance between raceway entries enclosing the same conductor is

Shall not be less than 6 times the trade diameter or MD of the largest raceway.

FS,FD Boxes

Sized to permit the installation of switches and receptacles FD boxes are the same box just deeper

Sizing, Pulling and junction boxes for systems over 1,000 V (Angle Pulls)

The distance between each shielded cable is 36 times the diameter of the the largest conductor. may be reduced to 24 times the diameter when unshielded.

Sizing, Pull and junction boxes for systems over 1,000 V (straight pulls)

The length of the box must be 48 times the outside diameter When the conductor is unshielded the length needs to be reduced to 32 times the outside diameter.

For Raceway conductors of number 4 gagr wire and larger in straight pulls under 1,000 volts

The length of the box or conduit body shall not be less than eight times the trade diameter of the largest raceway.

Type C conduit body

Used as a pull point in a long conduit run. conduit bodys are typically used as pull points.

Boxes housing conductors over 1,000 V must be

completely enclosed permanately marked Danger High Voltage

IP Classification system: 2nd number

degree of protection from water

Handholes

is an encloser for use in underground systems, provided with an open or closed bottom and sized to allow personell to get in for manteinance. Hand hole enclosure covers must weigh over 100lbs or require the use of tools to open.

A Type T conduit body

is used to provide a junction point for 3 intersecting conduits and low point drains.

Moguls

raised covers to provide access to larger conductors during conductor splicing.

Type L conduit bodies

used as a pulling point for conduit that requires a 90 degree change in direction LB=Holes on the sides LL/LR= both sides

Pulling elbows

used exclusively for pulling wire at a corner point of conduit run (space is too small for splicing)

Type X Conduit bodies

used to provide a junction point for four intersecting conduits