Claire Dawson
Hospital-grade MC (Metal-Clad) cables are designed for use in healthcare facilities. They are primarily installed in hospitals, nursing homes, medical centres, clinics, and other medical enterprises for anything a patient can touch inside the exam room, including receptacles and light switches. Hospital-grade MC cables are distinguishable from regular MC cables by their aluminum bonding strip, which is in contact with the metallic jacket of the cable for its entire length, providing a safe grounding path with low impedance. This minimizes ground faults, which is crucial for maximized safety in hospital environments. When terminating hospital-grade MC cables, it is important to follow the manufacturer's instructions and use the correct connectors. The general process involves cutting the cable flush and bending the aluminum wire at a 90-degree angle before cutting it again. Some inspectors may also require the cable to be wrapped around the cable armor before insertion into the connector.
| Characteristics | Values |
|---|---|
| Cable Type | Metal-Clad (MC) |
| Cable Name | Hospital Grade MC, HCF MC, MCAP |
| Cable Construction | Solid soft-drawn copper Type THHN circuit conductors, redundant grounding, interlocked armour, green insulated copper grounding conductor |
| Installation Instructions | Cut flush, bend aluminium wire at 90 degrees, cut again |
| Use | For use in hospitals, nursing homes, medical centres, clinics, dental offices, and other medical enterprises for anything a patient can touch inside the exam room, including receptacles and light switches |
| Grounding | Safe grounding path with low impedance, minimises ground faults |
| Connectors | MCI-A, MCIA, snap-in connectors |
| Cable Jacket | Metallic jacket with aluminium bonding strip for entire length |
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What You'll Learn
Use the correct connectors
When terminating hospital-grade MC cable, it is essential to use the correct connectors. This type of cable is specifically designed for use in healthcare facilities, and its unique features require specific connectors to ensure safe and effective termination.
Hospital-grade MC cable, also known as HCF MC, differs from regular MC cable in that it includes an aluminium bonding strip that is in contact with the metallic jacket of the cable. This bonding strip provides a safe grounding path with low impedance, minimising ground faults. As a result, the jacket itself becomes an additional grounding path, supplementing the green grounding wire.
To accommodate this additional grounding path, the correct connectors are essential. The connectors used must be compatible with the aluminium bonding strip and the metallic jacket. Using inappropriate connectors can compromise the safety and integrity of the grounding path.
The specific connectors required may vary depending on the manufacturer and the exact specifications of the cable. It is important to consult the manufacturer's instructions and guidelines to select the appropriate connectors. Some common types of connectors used with hospital-grade MC cable include snap-in connectors, locknut-type connectors, and connectors with built-in anti-short bushings.
Additionally, it is crucial to ensure that the connectors carry the appropriate listings. For example, connectors for hospital-grade MC cable should have the MCI-A listing. Using listed connectors ensures compatibility and helps maintain compliance with relevant standards and regulations.
By using the correct connectors and following the manufacturer's instructions, you can safely and effectively terminate hospital-grade MC cable, maintaining the integrity of the grounding path and ensuring the cable's performance and safety in healthcare environments.
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Cut the wire off at the armour
To cut the wire off at the armour, you will need to prepare the necessary tools and materials, including a utility knife, wire cutters, armour stripper or sharp knife, and a clean work area. Here are the steps to follow:
Begin by measuring the length of the MC cable that needs to be removed. Using the utility knife, carefully score the outer jacket of the cable at the desired length. This will make it easier to cut through the jacket without damaging the inner wires. Next, use the wire cutters to snip through the copper conductors inside the cable. Cut each conductor at the scored line to ensure a clean break.
Now, you will need to remove the armour, or metallic shielding, from the cable. Using an armour stripper or a sharp knife, carefully cut through the armour along the length of the cable. Take extra care not to cut too deeply, as you do not want to damage the inner insulation of the wires. Once you have made a shallow cut along the length of the armour, you should be able to peel it back and remove it from the cable.
After removing the armour, inspect the inner wires for any damage. Ensure that the insulation is intact and that there are no exposed conductors. If any damage is observed, you may need to trim back the wires further to ensure a safe and secure connection. Finally, clean up any sharp edges or frayed wires using the utility knife or wire cutters. This will help prevent injuries and ensure a neat and tidy termination.
By following these steps, you can safely and effectively cut the wire off at the armour when terminating hospital-grade MC cable. Remember to take your time, use the appropriate tools, and always prioritize safety when working with electrical cables.
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Bend the aluminium bonding wire at a 90-degree angle
When terminating hospital-grade MC cable, it is essential to follow the manufacturer's instructions and industry standards. One critical step in this process involves bending the aluminium bonding wire at a 90-degree angle. Here is a detailed guide on how to perform this task effectively:
Prepare the Wire:
Before bending the aluminium bonding wire, it is important to ensure that you have the right tools and that the wire is properly secured. Mark the wire at the desired bend location, allowing for minor errors, as creating a precise 90-degree bend can be challenging. Secure the wire firmly, preferably holding it by the larger portion. You can use pliers or grip the wire with two small pieces of wood on either side to avoid marking the wire. If using pliers, consider wrapping a cloth around the jaws to protect the wire.
Bend the Wire:
To achieve an accurate 90-degree bend, you can create a simple jig by drilling two crossing holes in a piece of wood and cutting it at 90 degrees through the centre of the holes. This will give you two pieces of wood with crossing grooves that can guide your bend. Alternatively, you can use a protractor to check the angles and ensure precision. Bend the wire by gripping it with pliers and turning in the desired direction or use a vice with a block of wood to ensure even bending.
Finalize the Connection:
After bending the aluminium bonding wire at a 90-degree angle, you will typically need to cut the wire flush. Some sources suggest bending the wire back slightly, about half an inch, before cutting. It is important to note that you should not wrap the wire around the outside of the jacket for hospital-grade MC cable. Make sure to use the listed connectors, usually MCIA, and follow the manufacturer's instructions for the specific cable you are working with.
Additional Considerations:
When working with hospital-grade MC cable, it is important to be aware of the redundant ground requirement in healthcare environments. This type of cable usually has a green wire and aluminium bonding wire. The connectors and clamps must carry the MCI-A listing. Additionally, the spiral metal casing serves as an acceptable ground, and the green insulated wire can be used as an isolated ground if needed.
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Use a green ground screw
When terminating hospital-grade MC cable, it is essential to understand the role of the green ground screw. This screw is a critical component that ensures a safe and secure connection for the cable. Here is a comprehensive guide on using a green ground screw when terminating hospital-grade MC cable:
Understanding the Green Ground Screw:
The green ground screw is specifically designed to establish a reliable ground connection for the cable. It is typically located at the back of the junction box (JB) or enclosure, providing a convenient and accessible point for grounding. Its distinct green colour immediately identifies its function as a grounding component, aiding in installation and maintenance.
Preparation for Grounding:
Before using the green ground screw, it is essential to prepare the cable properly. This involves cutting the cable flush, ensuring that any excess wire is removed. In some cases, you may need to bend back a small portion of the wire, approximately half an inch, to facilitate a secure connection. However, it is important not to wrap the wire around the outside of the cable jacket, as this can compromise the integrity of the grounding path.
Connecting to the Green Ground Screw:
Once the cable is prepared, it's time to connect it to the green ground screw. Start by stripping a short length of insulation from the end of the ground wire, exposing the bare conductor. Then, position the cable so that the exposed conductor makes direct contact with the green ground screw. Use an appropriate screwdriver to tighten the screw securely, ensuring a firm and reliable connection.
Grounding in Hospital Environments:
It is important to note that grounding procedures may vary slightly in hospital environments. Hospital-grade MC cable typically features a redundant ground, which means additional grounding measures are already in place. In such cases, the green ground screw may not be necessary for the cable itself, but it can still be used to splice insulated green wires through to other junction boxes or devices, ensuring a consistent ground path throughout the electrical system.
Maintaining Grounding Integrity:
To maintain the integrity of the ground connection, it is crucial to use listed connectors and follow manufacturer recommendations. Locknuts and screws should be avoided, as they can loosen over time, leading to a loss of the armour ground. Instead, opt for connectors that utilise spring tension or snap-in mechanisms, which provide a more secure and reliable connection for hospital-grade MC cable terminations.
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Wrap the wire around the cable armour
Wrapping the wire around the cable armour is an important step in terminating hospital-grade MC (Metal-Clad) cable. This type of cable is specifically designed for use in healthcare facilities, such as hospitals, nursing homes, medical centres, and clinics. It is crucial to follow the correct procedures to ensure safe and effective cable termination.
The wire in question is typically a #10 aluminium bonding conductor or wire. This wire serves as a safe grounding path in addition to the green grounding wire present in the cable. To begin the wrapping process, it is recommended to bend the aluminium wire at a 90-degree angle to the MC cable. This creates a neat starting point for the wrapping process.
Next, you will want to carefully wrap the wire around the cable armour. It is important to maintain an even tension and follow the ridges of the armour as you wrap. The goal is to create a secure and uniform coil around the cable armour. The number of wraps can vary, but it is typically suggested to wrap the wire around the armour two to three times. This ensures a strong connection and helps to prevent the wire from loosening.
After completing the desired number of wraps, you can then insert the wrapped portion into the connector. This will provide additional stability and protection for the termination. It is important to note that the connector should be specifically designed for hospital-grade MC cable and carry the MCI-A listing. Using the correct connector is essential to maintain the integrity of the grounding path.
By following these steps and paying close attention to detail, you can effectively wrap the wire around the cable armour when terminating hospital-grade MC cable. Remember to refer to the manufacturer's instructions and guidelines for specific instructions related to the cable you are working with.
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Frequently asked questions
Hospital-grade MC (Metal-Clad) cables are metal-clad cables designed for healthcare facilities. They are used in hospitals, nursing homes, medical centres, clinics, dental offices, and other medical enterprises for anything a patient can touch inside the exam room, including receptacles and light switches.
The major difference between HCF MC and regular MC cables is the aluminum bonding strip that is in contact with the metallic jacket of the HCF MC cable for its entire length, providing a safe grounding path with low impedance. This minimizes ground faults, which is crucial for maximizing safety in hospital environments.
To ensure proper cable termination, refer to the installation instructions provided with every reel and coil. However, some sources suggest cutting the cable flush, while others recommend wrapping it around the cable armour a few times before inserting it into the connector.
Make sure to use the listed connectors, which are usually MCIA connectors. Avoid using locknuts and screws as they can loosen and cause the armour ground to fail. Instead, use snap-in connectors, which are spring-loaded.
