Circuit Breaker Sizing کا حساب کیسے لگائیں
Circuit Breaker Sizing کیا ہے؟
Selects appropriate circuit breaker to protect circuits from overcurrent while allowing normal operation. Wrong sizing causes nuisance trips or fire risk.
فارمولا
Typical breaker = current × 1.25 (non-motor) or × 2.5 (motor)
مرحلہ وار گائیڈ
- 1Calculate circuit maximum current
- 2Breaker must exceed running current for motor inrush
- 3Typical breaker = current × 1.25 (non-motor) or × 2.5 (motor)
- 4Match breaker to wire ampacity (wire must handle breaker rating)
- 5Select trip curve (A, B, C, D) for application
حل شدہ مثالیں
ان پٹ
40A circuit, #8 wire
نتیجہ
50A breaker
عام غلطیاں جن سے بچنا ہے
- ✕Oversizing breaker to avoid nuisance trips (creates fire hazard)
- ✕Using undersized wire for breaker rating
اکثر پوچھے جانے والے سوالات
Why not just use larger breaker?
Oversized breaker won't protect from short circuits, creating fire/electrocution risk.
What's the difference between breaker curves?
A: sensitive (electronics), B: general, C: motors, D: high inrush; choose for application.
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