For a 45kVA transformer, 54A×1.25=68A, so use a 4 AWG conductor rated 85A at 75°C , per Table 310.16.
What size breaker do I need for a 45 kva transformer?
A 45 KVA transformer protected on the supply side with a 70-ampere circuit breaker multiplied by the ratio of 2.3 would result in the secondary conductors having a minimum ampacity of 16.1 amperes or 1/10 the size of the primary overcurrent device after the voltage ratio is applied.
What size wire do I need for a transformer?
For Transformer, we should choose two types of cable such as the primary side and secondary side. The rating of the cable should be 150% of the full load current . i.e if your transformer’s primary current is 450 Amps means, you should choose 450 *150% = 675 Amps capacity size cable.
What size wire do I need for a 75 kva transformer?
This transformer is rated 75,000 VA (75 kVA × 1,000 = 75,000). The primary side current will be 90 amperes (A) (75,000 ÷ 480 ÷ 1.732 = 90.2 = 90). This transformer will be sized for continuous loads; therefore, the conductors must have an ampacity of at least 113A (90 × 125% = 112.5 = 113).
What are the dimensions of a 45 KVA transformer?
| Height 30 in (762.00 mm) | Width 20 in (508.00 mm) | Depth 20 in (508.00 mm) | Product Weight 320.00 lb(US) (145.15 kg) |
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How many amps is a 45 kVA transformer good for?
| KVA 208V 480V | 45 125 54.2 | 50 139 60.2 | 60 167 72.3 | 75 208 90.3 |
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What size breaker do I need for a 150 kVA transformer?
150 KVA @ 480 3Ø = 180 amps . You can feed it with a 200 but if it’s loaded to the gills, it’ll push the 200 a bit. 150 KVA @ 120/208 3Ø = 416 amps.
How do you size a fuse for a transformer?
In lieu of transformer inrush data, the rule of thumb is to select a fuse size rated at 300% of the primary full-load current and round up to the next larger standard size .
How do I know what size core I need for my transformer?
The best possible cross-sectional part of the core is roughly assigned by: Core Area: 1.152 x √(output voltage x output current) sq cm . With regard to transformers having several secondaries, the sum of the the output volt-amp product of each winding needs to be considered.
How do you calculate cable size?
Divide the voltage running through the cable by your target current . If, for instance, 120 volts will act on the cable, and you want 30 amps to run through it: 120 / 30 = 4. This is your target resistance, measured in ohms. 30,000 x 1.724 x 10^-8 = 0.0005172 ohm sq.
What size wire do I need to feed a 30 kVA transformer?
45kVA transformer — Per Table 250.122, 70A primary protection (Step 2) requires an 8 AWG copper conductor .
What is 1 kVA in amps?
| kVA (Apparent Power) Voltage (220 V) Amperage (A) | How many amps is 1 kVA? 220 V 4.55 Amps | How many amps is 5 kVA? 220 V 22.73 Amps |
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What is the weight of a 75 kVA transformer?
| Height 37 in (939.80 mm) | Width 30 in (762.00 mm) | Depth 20 in (508.00 mm) | Product Weight 410.00 lb(US) (185.973 kg) |
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How much does a 30 kva transformer weight?
| Height 27 in (685.80 mm) | Width 20 in (508.00 mm) | Depth 16 in (406.40 mm) | Product Weight 260.00 lb(US) (117.934 kg) |
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How many amps does a 15 kva transformer put out?
| Three Phase Transformers, Full Load Amperes (FLC) | KVA 208V 480V | 15 41.7 18.0 | 30 83.4 36.1 | 45 124 54.2 |
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What is KVA electricity?
A KVA is simply 1,000 volt amps . ... An amp is electrical current. A term called apparent power (the absolute value of complex power, S) is equal to the product of the volts and amps. On the other hand, a watt (W) is a measurement of real power.
