§5–602.

    (a)    (1)    In this section the following words have the meanings indicated.

        (2)    “Confined space” means a space that, by design:

            (i)    has limited openings for entry and exit; and

            (ii)    is subject to:

                1.    the accumulation of a combustible agent;

                2.    an accumulation of a toxic agent; or

                3.    a deficiency of oxygen.

        (3)    “Confined space” includes:

            (i)    a basin;

            (ii)    a bin;

            (iii)    a degreaser;

            (iv)    a duct;

            (v)    a pipeline;

            (vi)    a pit;

            (vii)    a sewer;

            (viii)    a silo;

            (ix)    a tank that is enclosed or has an open top;

            (x)    a tub;

            (xi)    a tunnel;

            (xii)    a vat;

            (xiii)    a process vessel; or

            (xiv)    a reaction vessel.

        (4)    “Maintenance work” means cleaning, inspection, maintenance, painting, repair, servicing, or other similar work.

    (b)    A person described in § 5–101(d)(2)(ii) or (iii) of this title may not allow or cause an individual described in § 5–101(c)(2)(iii) or (iv) of this title to do maintenance work in a confined space, unless the Commissioner:

        (1)    grants written authorization based on a satisfactory showing that work practices in effect will protect the health and safety of the individual; or

        (2)    in accordance with Subtitle 3 of this title, passes an order for a variance.

    (c)    (1)    This subsection applies only to an employer who is a subcontractor.

        (2)    Each subcontractor who, under an original contract or subcontract, is to do maintenance work in a confined space shall give the Commissioner:

            (i)    at the commencement of the maintenance work, oral notice of the maintenance work to be performed; and

            (ii)    within 24 hours after the oral notice, written notice of the maintenance work.