Maryland Labor and Employment Section 5-602
§ 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) may not allow or cause an individual described in § 5-101(c)(2)(iii) or (iv) 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.
