150 Section 3 Installation Copyright Goodheart-Willcox Co., Inc. Goodheart-Willcox Publisher Figure 10-11. A box offset is used to bring the conduit away from the mounting surface so that it fits into a box. Goodheart-Willcox Publisher Figure 10-12. The saddle bend consists of one 45° center bend and two 22 1/2° lateral bends. 10.2 Electrical Nonmetallic Tubing A fl exible type of plastic corrugated raceway called electrical nonmetallic tubing (ENT) is recognized for general use by the NEC under Article 362. It is fl ame-retardant and resistant to moisture and chemical atmospheres. ENT typi- cally has a bright blue color and is known in the trades as “smurf tube” or simply “smurf,” after the popular cartoon characters. ENT can be used in almost any building or dwelling regardless of height and can be con- cealed behind walls or above ceilings. It can also be embedded in concrete. Being light- weight and flexible, ENT is easy to handle and cut. The various connectors, couplings, and fit- tings are attached with snap-locks or plastic bonding cement. Installation varies and should 4. Make two lateral marks, one on each side of the center mark. These marks are 2 1/2″ away from the center mark for every 1″ of obstruction height (in this example: 4 × 2 1/2″ = 10″). 5. Place the conduit bender handle on the floor and secure it with your foot. Posi- tion the conduit in the bender so that the center mark is aligned with the rim notch (or the teardrop mark) on the bender head. Bend the conduit to 45°, being careful not to kink it. 6. Without removing the conduit from the bender, rotate the conduit 180° and slide it forward (slide the first bend away from you) until the lateral mark closest to you is aligned with the arrow. Bend the conduit to 22 1/2°. 7. Remove the conduit and fl ip it end-for- end. Position it back in the bender with the second lateral mark closest to you. Line up the second lateral mark with the arrow and bend to 22 1/2°. Test-fi t the conduit to make sure it clears the obstruction. 22 1/2° Bends 45° Bend Making a Box Offset Step 1. Mark the conduit 2″ and 8″ from the end. Step 2. Align the 2″ with the arrow in the conduit bender and bend 5°. Step 3. Slide the conduit in the bender, rotate 180°, align the 8″ mark with the arrow, and bend 5°. Step 4. Install the conduit.