Calculated Industries ElectriCalc Pro User Manual - — 45
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— 45
EQuIPmENT GROuNDING COuNDuCTOR WIRE SIZE
The keystroke can be used to find the Grounding
conductor size for raceways and “over-current devices in circuit
ahead” equipment. The calculator assumes the displayed value as
Amperage to solve for the Equipment Grounding conductor based
on NEC Table 250.122.
Find the Equipment Grounding conductor size required when the
circuit breaker is rated at 45 Amps. What is the equivalent
Aluminum size?
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1. Find Equipment Ground Wire Size:
(EqGrnd)
eQPG 10 Cu
WIRe sIZe
2. Find Aluminum size:
eQPG 8 al
WIRe sIZe
3. Display NEC Table:
neC 250.122
FuSE aND CIRCuIT bREaKER SIZE
Fuse and Breaker sizing is determined by NEC Table 430.52.
Once the Motor Type is defined via L, a Full-Load
Current amperage value can be used to find the Fuse Breaker Sizes.
What is the calculated Dual Element and Single Element Fuse
size for a 230 Volt, 3-Phase, 50 HP Induction motor? What are
the Instantaneous Trip and Inverse Time Circuit
Breaker requirements?
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(cont’d)