(A) Unless otherwise provided by the rules adopted by the board of building standards pursuant to division (A)(4) of section 4104.02 of the Revised Code, no person shall operate a low pressure steam boiler that has more than three hundred sixty square feet of heating surface, unless one of the following applies to that person:

1. (1) The person is licensed as a steam engineer, high pressure boiler operator, or low pressure boiler operator in accordance with section 4104.19 of the Revised Code.
2. (2) The person is working under the direct supervision of a steam engineer, high pressure boiler operator, or low pressure boiler operator.

(B) Unless otherwise provided by the rules adopted by the board pursuant to division (A)(4) of section 4104.02 of the Revised Code, no person shall operate a power boiler that has more than three hundred sixty square feet of heating surface, unless one of the following applies to that person:

1. (1) The person is licensed as a steam engineer or high pressure boiler operator in accordance with section 4104.19 of the Revised Code.
2. (2) The person is working under the direct supervision of a steam engineer or high pressure boiler operator.

(C) Unless otherwise provided by the rules adopted by the board pursuant to division (A)(4) of section 4104.02 of the Revised Code, no person shall operate a stationary steam engine at more than thirty horsepower unless one of the following applies to that person:

1. (1) The person is licensed as a steam engineer in accordance with section 4104.19 of the Revised Code.
2. (2) The person is working under the direct supervision of a steam engineer.