Snorkel SPM20-sn00000 - Manual (Page 14)

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Table 1-1. Minimum Safe Approach Distance (M.S.A.D.)
VOLTAGE RANGE
(PHASE TO PHASE)
MINIMUM SAFE APPROACH
DISTANCE-Feet (m)
0-50KV 10(3)
Over 50KV to 200KV 15(5)
Over 200KV to 350KV 20(6)
Over 350KV to 350KV 25(8)
Over 500KV to 750KV 35(11)
Over 750KV to 1000KV 45(14)
NOTE: Th is Minimum Safe Approach Distance shall apply except where employer, local,
or governmental regulations are more stringent.
Maintain a clearance of at least 10 ft (3m) between any part of the machine and its
occupants, their tools, and their equipment from any electrical line or apparatus carrying
up to 50,000 volts. One foot (0.3m) additional clearance is required for every additional
30,000 volts or less.
The minimum safe approach distance may be reduced if insulating barriers are installed to prevent
contact, and if the barriers are rated for the voltage of the line being guarded. These barriers
shall not be part of (or attached to) the machine. The minimum safe approach distance shall be
reduced to a distance within the designed working dimensions of the insulating barrier. This
determination shall be made by a qualified person in accordance with
employer, local, or governmental requirements for work practices near energized equipment.
Safety Rules for Electrical Control System
• Only personnel who are properly trained and have adequate knowledge and skill should
undertake all electrical/electronic troubleshooting and repair.
• Do not alter or bypass protective interlocks.
• Before starting, read and observe all warning labels.
• When trouble shooting make sure the power source has been disconnected and main
switch has been locked.
• Take extra precautions in damp areas to protect you from accidental grounding.
• Before applying power to any equipment it must be established, without a doubt, that all
persons are clear.
• Do not open the electrical control panel unless it is necessary to check the electrical
equipment.
• Do not alter the electrical circuits unless authorized to do so by the manufacturer.
• When replacing electrical components, make sure they conform to the manufacturer’s
specifications, including proper color coding.
• Do not wear metal frame glasses, metallic necklaces or chains while working on any
electrical equipment. Also do not wear any ring, watch or bracelet while operating
electrical equipment.