Dennis Alwon said:
Here is another question somewhat related and conneceted to structures.
Suppose the well house is the typical fiberglass bubble that goes over the well casing that comes out of the ground. Holding tank and pressure switch are both at the house. The disco is a lock out breaker with a DP switch under the house to disconnect the controller.
Is a disco required at the well head?
I say yes it is required within site of the well head.430.101 seems to agree with this the only exception that I see applying would be if it is impracticle and it doesn't seem the case in this situation.
IX. Disconnecting Means
430.101 General.
Part IX is intended to require disconnecting means capable of disconnecting motors and controllers from the circuit.
FPN No. 1: See Figure 430.1.
FPN No. 2: See 110.22 for identification of disconnecting means.
430.102 Location.
(A) Controller. An individual disconnecting means shall be provided for each controller and shall disconnect the controller. The disconnecting means shall be located in sight from the controller location.
Exception No. 1: For motor circuits over 600 volts, nominal, a controller disconnecting means capable of being locked in the open position shall be permitted to be out of sight of the controller, provided the controller is marked with a warning label giving the location of the disconnecting means.
Exception No. 2: A single disconnecting means shall be permitted for a group of coordinated controllers that drive several parts of a single machine or piece of apparatus. The disconnecting means shall be located in sight from the controllers, and both the disconnecting means and the controllers shall be located in sight from the machine or apparatus.
(B) Motor. A disconnecting means shall be located in sight from the motor location and the driven machinery location.Exception: The disconnecting means shall not be required to be in sight from the motor and the driven machinery location under either condition (a) or (b), provided the disconnecting means required in accordance with 430.102(A) is individually capable of being locked in the open position. The provision for locking or adding a lock to the disconnecting means shall be installed on or at the switch or circuit breaker used as the disconnecting means and shall remain in place with or without the lock installed.
(a) Where such a location of the disconnecting means is impracticable or introduces additional or increased hazards to persons or property
(b) In industrial installations, with written safety procedures, where conditions of maintenance and supervision ensure that only qualified persons service the equipment
FPN No. 1: Some examples of increased or additional hazards include, but are not limited to, motors rated in excess of 100 hp, multimotor equipment, submersible motors, motors associated with adjustable speed drives, and motors located in hazardous (classified) locations.
FPN No. 2: For information on lockout/tagout procedures, see NFPA 70E-2004, Standard for Electrical Safety in the Workplace.