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(a) Vertical portable metal spars shall be guyed with no less than six guylines, each providing strength equal to that of the mainline used.
(b) Guylines shall be arranged so that stresses are imposed on no less than two guylines.
(c) Leaning portable metal spars 55 feet or more in length from base or trunnion shall be guyed with no less than three back guys, each at least equal in strength to that of the mainline used. Guys shall be arranged so that strains are imposed on no less than two back guylines. In addition, one nose, or snap guy of equal strength to the mainline, or a means providing equivalent stability, shall be used.
(d) Leaning portable metal spars less than 55 feet in length from base or trunnion, when used with mainline or skyline smaller than 1 1/8-inch diameter, shall be guyed with no less than two back guys, each of strength at least equal to line 1/4-inch larger than the mainline used. Back guys shall be arranged to form an angle 70-90 degrees with each other and opposite the direction of stress. In addition, one nose, or snap guy of the same size used for the back guys, or a means providing equivalent stability, shall be used. When used with mainlines 1 1/8-inch diameter, or larger, such spars shall be guyed as required in (c).
(e) Boom-type machines used for yarding, which are specifically designed to be self-stabilizing, may be used without guying. When the stability of the machine is impaired in any manner, the machine shall be guyed.
(f) Any additional guying recommended by the spar manufacturer shall be used.
(g) Guylines shall be anchored as required in Section 6295, except they may be choked around adequately notched stumps when shackles or approved choker attachments are used. If cable clamps are used, two full wraps or more must be placed around an adequately notched stump to secure the guyline.
(h) Stress bearing guylines should be anchored to provide a guyline angle no steeper than 45 degrees from horizontal.
(i) Safety straps or other devices of appropriate size and design shall be installed at the top of the spar to prevent guylines from falling.
NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.