Siemens I-T-E Sensitrip MD Series Information And Instruction Manual page 51

I-T-E Enclosures
Type 1- MND61
General purpose indoor, sheet-steel enclosure for use in
normal atmosphere, listed as service-entrance equipment.
Type 12 - MND612
A special-industry, sheet-steel enclosure for indoor use in
atmosphere containing particles of lint, dust, dirt, sawdust
and other foreign matter
Type 3R - MND63
An outdoor, sheet-steel enclosure providing protection against
driving rain, sleet or snow. Listed as service-entrance equip-
ment.
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