UL 1995 vs 1996 Simplified
- Duct Heaters are judged under U.L. 1996 only.
- Duct Heaters are tested for duct applications at least 4 feet from heating or cooling equipment.
- An exception to this can be made if the heater is tested and approved by a regulatory
agency for use with a specific piece of equipment and indicated as such on the product
label. (See UL1996 Section 2.1.3 & 45.1.8) - Refer to Tutco installation instructions for pertinent requirements.
- An exception to this can be made if the heater is tested and approved by a regulatory
- Duct Heaters are required to have secondary temperature protection.
UL1995 Standard (Packaged Heaters)
- Can be similar to a Duct Heater, but is typically judged under (but not limited to) U.L.1995.
- These heaters are tested in, on or within (but not limited to) 4 feet from heating and/or cooling
equipment. - They are specific to the piece of equipment they were tested with.
- In some cases these heaters do not require secondary temperature protection if line duty primary
temperature protection is used or if the controlling contactors or relays are rated 250,000 electrical
cycles.