Trade of Electrician Motor Control COURSE NOTES - eCollege
Trade of Electrician Motor Control COURSE NOTES - eCollege
Trade of Electrician Motor Control COURSE NOTES - eCollege
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FAS Electrical Course Notes – Module 2.4.2<br />
Figure 14 illustrates an example <strong>of</strong> a motor final circuit equipment layout.<br />
Figure 14<br />
Note: A separate earth protective conductor was fitted on the outside <strong>of</strong> the older types <strong>of</strong><br />
flexible conduit. Therefore mechanical protection was not provided.<br />
In modern installations it must be installed inside the flexible conduit with the power cables.<br />
Flexible Conduit<br />
Distribution<br />
Board<br />
Three Phase<br />
<strong>Motor</strong><br />
Through Box to help draw in cables<br />
( Depending on length <strong>of</strong> run <strong>of</strong> conduit )<br />
Fixed Conduits<br />
Flexible conduit is made <strong>of</strong> interlinked metal spirals <strong>of</strong>ten covered with a PVC sleeving. The<br />
tubing must not be relied upon to provide a continuous earth path and, consequently, a separate<br />
protective conductor must be run inside the flexible tube.<br />
Flexible conduit is used for the final connection to motors so that the vibrations <strong>of</strong> the motor /<br />
machine are not transmitted throughout the electrical installation. It also allows adjustments to<br />
be made to the final motor position for drive belt tension etc.<br />
14<br />
<strong>Motor</strong><br />
Isolator<br />
( 3 Pole )<br />
Coupling and male<br />
brass bush at terminations<br />
Starter ( DOL )<br />
Flexible conduit<br />
Terminated in gland<br />
On<br />
Off<br />
Start<br />
Stop<br />
Separate Protective Conductor<br />
Revision 4. Feb 2009
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