Figure 5-42. - Alignment of arrow and take-up mark for bending a 90.
Now, let us see how a 90 is made to fit a specific situation. Suppose you are going to run the conduit from the top of a panel to the ceiling and then horizontally along the ceiling, using 1/2-inch EMT and a one-shot bender. The first step will be to measure from the top of the panel to the ceiling. This measurement will give you the stub length. Assume the length is 18 inches. Measure 18 inches from the end of the conduit and make a mark at that point. Next, look at table 5-2 and find the take-up for 1/2-inch EMT. The take-up is 5 inches. Now, measure 5 inches back toward the end of the conduit from your first mark and make a second mark. This measurement gives you the take-up. Place the conduit on the floor with the stub in front of you. Align the bender arrow with the take-up mark, as shown in figure 5-42. Put one foot on the footrest and hold the handle with both hands. Apply pressure on the footrest as you pull the handle until the handle is at about a 30- degree angle with the floor, as shown in figure 5-43. You should now have a 90-degree bend with an 18-inch stub. Remember: Heavy foot pressure is critical to keep the EMT in the bender groove and prevent kinked conduit. To check that the bend will fit the situation we started with, you can place it next to anything that you know is a right angle and measure from the floor to the end of the stub. If the bend is not a full 90, place the bender back on the conduit, and pull more bend. If it is more than a 90, place the handle of the bender over the end of the stub, place one foot on the conduit on the floor, and spring the stub back.
BACK-TO-BACK BENDS. - The back-to-back bend is actually two adjacent 90s made in the same piece of conduit. You make the first 90 with the amount
Figure 5-43. - Right-angle bend, 90.Continue Reading