A-A-51183A
Unless otherwise specified (see 7.3(f)), the power source shall be capable of operating in parallel with two or more similar power sources of the same manufacture when connected according to the manufacturer's instructions.
3.2.2 Controls. Unless otherwise specified (see 7.3(g)), the power source controls shall, as a minimum, include an on/off power switch and a welding current selection switch. If required, the power source shall be furnished with the following as specified (see 7.3(h)):
a. Arc force control.
b. Variable hot start control.
c. Output current polarity switch.
d. Output voltage and current meters.
3.2.3 Enclosure. The power source enclosure shall be fan cooled and manufactured to withstand the rough handling normally encountered in construction areas. Ventilation holes shall be covered with screens or be small enough to prevent entry of debris. The enclosure shall be fitted with handles, wheels, or lifting eyes as specified (see 7.3(i)).
3.2.4 Electrical system. Unless otherwise specified (see 7.3(j)), the electrical system shall conform to International Electrotechnical Commission (IEC) 60974-1, "Arc Welding Equipment
- Part 1: Welding Power Sources". The power source shall have dual 230/460-volt, 3-phase,
60-hertz circuit capability and shall be wired for the voltage specified (see 7.3(k)). The power source external electrical circuit connection shall be a wall receptacle plug or bare wires as specified (see 7.3(l)).
3.2.5 Optional accessories. Optional accessories shall be furnished as specified (see 7.3(m)).
3.3 Machine dimensions and weight. If required, the maximum power source dimensions
(length, width, and height) and weight shall not exceed the restrictions as specified (see 7.3(n)).
3.4 Safety and health requirements. The power source shall be designed and manufactured in accordance with IEC 60974-1. The manufacturer shall ensure that the power source and all equipment and accessories used on the machine shall be in compliance with Occupational Safety and Health Administration (OSHA) 29 CFR 1910, "Occupational Safety and Health Standards". If a conflict arises between the IEC 60974-1 and OSHA standards, the OSHA standards shall apply.
3.5 System of units. The U.S. Customary System of Units (US) or the International System of Units (SI) shall be used to graduate measuring and indicating devices. When only one system of graduation is acceptable, the particular graduation required shall be as specified (see 7.3(o)). Regardless of the measurement system used, all measuring and indicating devices on the machine shall be graduated in the same system. When specified (see 7.3(p)), measuring and indicating devices shall be graduated in both the US and SI system of measurements.
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