In the absence of a grounded shield, which method is acceptable for lead-in conductors entering a building?

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Multiple Choice

In the absence of a grounded shield, which method is acceptable for lead-in conductors entering a building?

When lead-in conductors enter a building without a grounded shield, there are multiple acceptable ways to protect and route them so they stay insulated and protected from damage. The essential idea is to provide a safe entry path that keeps the conductors secure, dry, and away from damage or contact with building materials. Passing through a drilled window pane offers an opening designed for conductor entry, and as long as the conductors are protected and the entry is properly sealed, this can be a valid route. Using a rigid noncombustible, nonabsorbent insulating tube or bushing gives a dedicated, protective sleeve at the entry point to guard the conductor insulation and prevent abrasion. Providing an opening specifically for the entrance conductors with a clearance of at least 2 inches ensures there is adequate space to avoid contact with surrounding materials and allows for secure strain relief. Because each of these methods provides the necessary protection and clearances, all of them are acceptable ways for lead-in conductors to enter a building when there is no grounded shield.

When lead-in conductors enter a building without a grounded shield, there are multiple acceptable ways to protect and route them so they stay insulated and protected from damage. The essential idea is to provide a safe entry path that keeps the conductors secure, dry, and away from damage or contact with building materials.

Passing through a drilled window pane offers an opening designed for conductor entry, and as long as the conductors are protected and the entry is properly sealed, this can be a valid route. Using a rigid noncombustible, nonabsorbent insulating tube or bushing gives a dedicated, protective sleeve at the entry point to guard the conductor insulation and prevent abrasion. Providing an opening specifically for the entrance conductors with a clearance of at least 2 inches ensures there is adequate space to avoid contact with surrounding materials and allows for secure strain relief.

Because each of these methods provides the necessary protection and clearances, all of them are acceptable ways for lead-in conductors to enter a building when there is no grounded shield.

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