What size breaker do I need for a 150 kVA transformer?

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What size breaker do I need for a 150 kVA transformer?

150 KVA @ 120/208 3Ø = 416 amps. This would obviously overload a 400 amp panel. If the 400 amp panel is loaded to the full 400 amps, you’ll see roughly 172 amps at the 200 amp breaker.

How many amps can a 150 kVA transformer handle?

Three Phase Transformers, Full Load Amperes (FLC)
KVA 208V 480V
75 208 90
112.5 312 135
150 416 180

What are the dimensions of a 150 kVA transformer?

Specifications

Height 43.75 in (1111.25 mm)
Width 32 in (812.80 mm)
Depth 27 in (685.80 mm)
Product Weight 800.00 lb(US) (362.874 kg)

How do you determine the wire size on 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 to feed a 45 kVA transformer?

For a 45kVA transformer, 54A×1.25=68A, so use a 4 AWG conductor rated 85A at 75°C, per Table 310.16.

How many amps does a 25 kVA transformer put out?

Three Phase Transformer

KVA 208V 480V
20 56.6 24.1
25 69.5 30.1
30 83.4 36.1
37.5 104 45.2

How many amps is a 5kva transformer good for?

22.73 Amps
kVA To Amps Calculator (With Table)

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
How many amps is 10 kVA? 220 V 45.45 Amps
How many amps is 20 kVA? 220 V 90.91 Amps

How big is a 300kva transformer?

Specifications

Height 49.50 in (1257.30 mm)
Width 41 in (1041.40 mm)
Depth 32 in (812.80 mm)
Product Weight 1359.00 lb(US) (616.432 kg)

What is the weight of a 75 KVA transformer?

410.00 lb
Specifications

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)

What are the standard sizes of transformers?

Especially for commercial buildings, the most common sizes for transformers are the following:

  • 3 kVA.
  • 6 kVA.
  • 9 kVA.
  • 15 kVA.
  • 30 kVA.
  • 37.5 kVA.
  • 45 kVA.
  • 75 kVA.

What is the weight of a 75 kVA transformer?

What’s the maximum voltage for a 150 kVA transformer?

Therefore, having a 400 amp, 120/208 volt, 3-phase panel as you propose would be permitted. Also per NEC Table 450.3 (B), the maximum rating of the primary OCPD for the 150 kVA transformer would be 250 amps ( (150 kVA x 1000) / (480 volts x 1.732), rounded up to the next standard OCPD size).

How many volts are in a 3 phase AMP?

3-Phase Amps = KVA / Volts / 1.732 x 1000

How big of a transformer do I need for 120 volt?

This equates to 461.5 amps at 120/208 volt, 3-phase. If you want to convert the entire 200 amp 277/480 volt, 3-phase service to 120/208 volt, 3-phase, you would need a minimum of a 225 kVA transformer. However, a 150 kVA transformer will likely suffice if the HVAC equipment is 480 volt.

How to calculate the KVA of a transformer?

1-Phase KVA = Volts x Amps / 1000 1-Phase Amps = KVA / Volts x 1000 3-Phase KVA = Volts x Amps x 1.732 / 1000 3-Phase Amps = KVA / Volts / 1.732 x 1000