An employer shall ensure that -
(a) every scaffold and every part of it is of good design and construction, composed of suitable and sound material and is of adequate strength for the purpose for which it is used or intended to be used,
(b) strength and stability calculations for scaffolding are carried out unless -
(i) a record of the calculations covering the structural arrangements contemplated is available, or
(ii) it is assembled in conformity with a generally recognised standard configuration,
(c) depending on the complexity of the scaffolding selected, an assembly, use and dismantling plan is drawn up by a competent person, which plan may be in the form of a standard plan supplemented by information on the scaffolding in question,
(d) a copy of the plan referred to in paragraph (c), including any instructions it may contain, is kept available for the use of persons concerned in the assembly, use dismantling or alteration of scaffolding until it has been dismantled,
(e) the dimen
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