The IG Series Surge Protective Devices are designed for a variety of Type 1 and Type 2 applicatons. Type 1 applications include outdoor installations before service entrances and utility meter cabinets. Type 2 applications include installations after service entrances. CSA listed to ANSI/UL 1449 3rd edition, the IG series is approved for residential/light commercial services (AC power, telephone and/or cable).