• Built and tested in accordance with applicable NEMA, ANSI and IEEE standards
• All 600 volt class transformers are UL listed unless otherwise noted
• Seismically tested, seismically qualified, and exceeds requirements of the Uniform Building Code (UBC) and California Code Title 24
• Designed for 60 Hz operation
• Short term overload is designed into transformers as required by ANSI: transformers will deliver 200% nameplate load for one-half hour; 150% load for one-hour; and 125% load for four-hours without being damaged provided that a constant 50% load precedes and follows the overload. See ANSI C57 .96-01.250 for additional limitations
• Primary and secondary windings are terminated in the wiring compartment
• Encapsulated units have copper leads or stabs brought out for connections, external cables rated at 90°C (sized at 75°C ampacity) for encapsulated designs recommended

Insulation System Classification

Ambient	+ Winding Rise	+ Hot Spot	= Temp. Class
40°C	55°C	10°C	105°C
40°C	80°C	30°C	150°C
40°C	115°C	30°C	185°C

The design life of transformers having different insulation systems is the same -the lower temperature systems are designed
for the same life as the higher temperature systems.

Sound Levels
All Micron 600 volt class dry-type distribution transformers are designed to meet NEMA ST-20 levels listed here.

KVA	NEMA Average* Sound Level in db40
0-9	40
10-50	45

 

*Applies to general purpose transformers only.

LVGP Catalog
Wiring Diagram A