is grounded, the motor control circuit shall be arranged so that an accidental ground in the control circuit remote from the motor controller will (1) not start the motor and (2) not bypass manually operated shutdown devices or automatic safety shutdown devices.
430.75 Disconnection.
(A) General. Motor control circuits shall be arranged so that they will be disconnected from all sources of supply when the disconnecting means is in the open position. The disconnecting means shall be permitted to consist of two or more separate devices, one of which disconnects the motor and the controller from the source(s) of power supply for the motor, and the other(s), the motor control circuit(s) from its power supply. Where separate devices are used, they shall be located immediately adjacent to each other.
Table 430.72(B) Maximum Rating of Overcurrent Protective Device in Amperes
Column A Protection Provided by Motor Branch-Circuit Protective Device(s)
Control
Column B Column C
Separate Conductors Conductors Extend
Protection Provided Within Enclosure Beyond Enclosure
Circuit Aluminum or Aluminum or Aluminum or
Conductor Copper-Clad Copper-Clad Copper-Clad
Size (AWG) Copper Aluminum Copper Aluminum Copper Aluminum
18 7 _ 25 7
16 10 — 40 — 10 —
14 (Note 1) — 100 — 45 —
12 (Note 1) (Note 1) 120 100 60 45
10 (Note 1) (Note 1) 160 140 90 75
Larger than 10 (Note 1) (Note 1) (Note 2) (Note 2) (Note 3) (Note 3)
Notes:
1. Value specified in 310.15 as applicable.
2. 400 percent of value specified in Table 310.17 for 60°C conductors.
3. 300 percent of value specified in Table 310.16 for 60°C conductors.
Exception No. 1: Where more than 12 motor control circuit conductors are required to be disconnected, the disconnecting means shall be permitted to be located other than immediately adjacent to each other where all of the following conditions are complied with:
(a) Access to energized parts is limited to qualified persons in accordance with Part XI of this article.
(b) A warning sign is permanently located on the outside of each equipment enclosure door or cover permitting access to the live parts in the motor control circuit(s), warning that motor control circuit disconnecting means are remotely located and specifying the location and identification of each disconnect. Where energized parts are not in an equipment enclosure as permitted by 430.232 and
430.233, an additional warning sign(s) shall be located
where visible to persons who may be working in the area
of the energized parts.
Exception No. 2: The motor control circuit disconnecting means shall be permitted to be remote from the motor controller power supply disconnecting means where the opening of one or more motor control circuit disconnecting means may result in potentially unsafe conditions for personnel or property and the conditions of items (a) and (b) of Exception No. 1 are complied with.
(B) Control Transformer in Controller Enclosure.
Where a transformer or other device is used to obtain a reduced voltage for the motor control circuit and is located in the controller enclosure, such transformer or
other device shall be connected to the load