146 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 fl called electrical nonmetallic tubing (ENT) is recognized for general use by the NEC under Article 362. It is fl ame-retardant and resistant to fl 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. 4 Make two lateral marks, s one on each side of the center mark. These Th marks are 2 1/2″ away from the cen e nt er mark for every 1″ of obstruction n height h (in this example: 4 × 2 1/2″ = = 10″). ″ 5. Place the h conduit bender handle o on the floor o r and secure it with your foot. fo Posi- tio ti on the conduit in the bender nd so that the center mark is aligned ed with the rim notch (or the teardrop op mark) on the bender head. Bend d the conduit to 45°, being careful not no to kink it. 6. Without removing mo the conduit from the bender, rot ro ta te the conduit 180° and slide it it forward f (slide the first bend away a wa from m you) until the lateral mark closest c lo se to to you is aligned with the arrow. ow . Bend B the conduit to 22 1/2°. 7. Remove the conduit and flip fl p i it end-for- fl fl end. Position it back in n the t he bender with the second lateral mark m ar k closest to you. Line up the second co d lateral mark with the arrow and n d bend be to 22 1/2°. Test-fit fi the conduit d ui t to to make sure it clears the obstruction. u ct io 22 22 22 22 22 22 22 22 22 22 2 2 2 2 1/2° 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 /2 /2 /2 /2 /2 /2 2 2 2 /2 2 2 /2 /2 2 ° ° ° ° ° ° ° ° ° Bendsn B B B B B B B B B B en en en en en en en en n n n ds ds ds ds ds ds ds ds d d d d ds d 45° 45 45 45 45 5 45 45 45 5 ° ° ° ° Bendne B B B B B B B B en en en en en en n e d d d d d d d d d d d 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.