Conductor Fill

Conductor Fill   Maximum Number of Conductors in Electrical Metalic Tubing Type Conductor Trade Size (in.) THHN, THWN, THWN-2 Size (AWG / kcmil) ½ ¾ 1 1¼ 1½ 2 2½ 3 3½ 4 14 12 10 8 12 9 5 3 22 16 10 6 35 26 16 9 61 45 28 16 84 61 […]

Portable Ladders

Portable Ladders   Portable Ladders Construction Ladders shall be capable of supporting the following loads without failure: Each portable ladder:  At least four times the maximum intended load, except that each extra-heavy-duty type 1A metal or plastic ladder shall sustain at least 3.3 times the maximum intended load. Ladder rungs, cleats, and steps shall be […]

Concentric Bends

Concentric Bends   Concentric Bends Concentric bends are a set of conduit bends that have a common center point, but have different centerline radii. Figure 1 shows three concentric bends produced from 2″ rigid conduit. Conduit 1 has a centerline radius of 20″. Conduit 2 has a centerline radius of 24 3/8″. Conduit 3 has […]

Center Of Bend

Center Of Bend     How To Find Center of Bend Electricians often need to locate the center of a bend that they have made, or the center of a bend that needs to be matched or aligned with a new bend.  A small torpedo level or straight edge is laid along the inside of […]

Assured Grounding

Assured Grounding   Electrical Protection of Employees on Construction Sites OSHA requires that employers shall use either ground-fault circuit interrupters or an assured equipment grounding conductor program to protect employees on construction sites. Ground-Fault Circuit Interrupters All 120-volt, single-phase 15- and 20-ampere receptacle outlets on construction sites, which are not part of the permanent wiring […]

Offset Bends

Offset Bends   Offsets Offset bends are used to move a run of conduit from one plane to another.  An offset is normally used to bend the conduit around an obstruction, or to relocate the conduit close to a structural member to make it easier to fasten the conduit.  Figure 2 shows an example of […]

Segment Bends

  Sample method to bend 3-1/2″ rigid conduit around a storage tank with a diameter of 160 feet. Segment bending is a method of bending conduit by making several small bends to produce one larger bend.  The method on this page illustrates a technique for bending a 3-1/2″ rigid conduit around a tank with a […]

Job Calls 8-21-00

IBEW Local 150 Job Calls   Friday, August 25, 2000 47 on Book I, 29 on Book II Contractor # Class. Call Job Description Location Jupiter 3 RW Long Hunters Farm Barrington Kendon 1 JW Short Clearview School Waukegan Lakewood 3 JW Long Kosco Store Lake Zurich ECI 2 JW Long Eddie Bauer Store – Deer […]

Trig Tables

Trig Tables   Trig. Tables Trigonometric Tables Angle Sin Cos Tan Csc Angle Sin Cos Tan Csc 1 0.017 1.000 0.017 57.299 46 0.719 0.695 1.036 1.390 2 0.035 0.999 0.035 28.654 47 0.731 0.682 1.072 1.367 3 0.052 0.999 0.052 19.107 48 0.743 0.669 1.111 1.346 4 0.070 0.998 0.070 14.336 49 0.755 0.656 […]


    Stacked Kicks Sample The drawing below illustrates 4 x 3in. EMT Conduits that are kicked from an overhead pipe rack to drop into an electrical distribution panel.  The outside diameter of the conduits is 3-1/2 inches. The Center to Center distance of the first kick is 30 inches, and each subsequent conduit is […]