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## LEARNING TASK 2 ### Using a single OLR contact Note that in Figures 1 to 6, three n.c. OLR contacts are shown. This is because a detector or heater element is required in each line conductor to the motor. In practice, the three heaters are often mounted in such a way that each heater can opera...

## LEARNING TASK 2 ### Using a single OLR contact Note that in Figures 1 to 6, three n.c. OLR contacts are shown. This is because a detector or heater element is required in each line conductor to the motor. In practice, the three heaters are often mounted in such a way that each heater can operate just one master set of contacts. A schematic diagram is used to indicate this by using just one OLR contact, as shown in Figure 7. Note that the n.c. OLR contact may be located ahead of the STOP button. - L1 - L2 - L3 *The OLR contact may be ahead of the STOP button* ### Figure 7 - Using a single OLR contact for three heaters [An image of an electrical circuit diagram which is complex, but not critical to understand. It would be difficult to describe accurately without the image] **Construction Electrician Apprenticeship Program: Level 1**