Guided scenario35 min· Path total 2 h 5 min

Motor branch circuits

ORIENT

What this module is for

Size conductors, overload, and short-circuit protection for a motor branch circuit.

EXPERIMENT

Work a motor branch circuit from nameplate to protection.

Enter motor horsepower and voltage and note the current basis used for conductor sizing.
Size the branch conductors.
Select overload and short-circuit / ground-fault protection and note that they differ.

CHECK

Motor overload protection and short-circuit protection are:

The same device with one ratingTwo distinct protective functions sized differentlyBoth sized at 125 % of full-load currentOptional when a VFD is used

APPLY

Explain why motor circuit conductors are not sized at the same percentage as the protective device.

Still outstanding before this module can be marked complete:

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