UL-3703:2015 pdf free download – STANDARD FOR SAFETY Solar Trackers.
9 Protection of Service Personnel
9.1 The requirements in this Section apply to the protection of service personnel who reach over, under, across, or around uninsulated electrical parts or moving parts to make adjustments or measurements while the tracker is energized. For requirements covering protection of users, see Protection of Users — Accessibility of Uninsulated Live Parts, Section 9.
9.2 Live parts shall be arranged and covers located to reduce the risk of electric shock or electrical energy-high current levels while covers are being removed and replaced.
9.3 An uninsulated live part involving a risk of electric shock or electrical energy-high current levels and a moving part that involves a risk of injury to persons shall be located, guarded, or enclosed to protect against unintentional contact by service personnel adjusting or resetting controls, or similar actions, or performing mechanical service functions that are performed with the equipment energized, such as lubricating a motor, adjusting the setting of a control with or without marked dial settings, resetting a trip mechanism, or operating a manual switch.
9.4 Live parts involving a risk of electric shock or electrical energy-high current levels and located on the back side of a door shall be guarded or insulated to protect against unintentional contact with live parts by service personnel.
9.5 A component that requires examination, resetting, adjustment, servicing, or maintenance while
energized shall be located and mounted with respect to other components and with respect to grounded
metal parts so that it is accessible for electrical service functions without subjecting service personnel to
a risk of electric shock, electrical energy-high current levels, or injury to persons by adjacent moving parts.
Access to a component shall not be impeded by other components or by wiring.
9.6 For an adjustment that is to be made with a screwdriver or similar tool when the tracker is energized, protection shall be provided against inadvertent contact with adjacent uninsulated live parts involving a risk of electric shock. Misalignment of the tool with the adjustment means when an adjustment is attempted is to be taken into account. This protection is able to be provided by:
a) Location of the adjustment means away from uninsulated live parts involving a risk of electric shock, or
b) A guard to reduce the potential for the tool contacting uninsulated live parts.
9.7 A live heat sink for a solid-state component, a live relay frame, and similar components, involving a risk of electrical shock or electrical energy-high current levels, which is mistakable for dead metal, shall be guarded to protect against unintentional contact by service personnel or shall be marked in accordance with 65.4.
Exception: This requirement does not apply to a heat sink mounted on a printed wiring board.
9.8 A moving part that involves a risk of injury to persons and that must be in motion during service operations not involving the moving part shall be located or protected against unintentional contact with the moving parts.