Front panel label

A

Test amperage

I

Voltage transformer ratio (VTR)

B

Class accuracy

J

Current transformer ratio (CTR)

C

Test constant (LED pulse rate)

K

Primary watthour constant

D

Frequency

L

Transformer factor (VTR x CTR)

E

Current range

M

Meter internal diagram (view from front of meter)

F

Form factor

N

ANSI bar code

G

Voltage input rating

O

Model number

H

Wiring configuration

P

Serial number