Mike-T
Member
- Location
- Liberal, KS
Have an application where 40 catalytic heaters would be installed in a building that only has 120v 1Ph service available. These heaters only require 120v power one time per year for about 1/2 hour to energize a heating element long enough to start the catalyst. Once started, the power is shut off and no longer required as long as fuel and air is supplied to the heater. The main problem is that each heater pulls 24amps for the 1/2 hour per year to get it started. Each heater can be started individually so the total load never exceeds 24amps, but the issue is the problem of having a connected load of 24amp x 40 heaters. Is there any exemption that would allow a PLC to interconnect all the loads on one circuit with relays to prevent more than one heater from ever starting at one time. Suggestions welcome. Note: This building is a class 1 div 2 area.