Best way to ground an Intersystem Bonding Termination (IBT)?

What is IBT grounding?

An intersystem bonding termination (IBT) for connecting intersystem bonding conductors shall be provided external to enclosures at the service equipment or metering equipment enclosure and at the disconnecting means for any additional buildings or structures.

What is intersystem bonding termination?

The National Electrical Code (NEC®) defines an Intersystem Bonding Termination as “a device that provides a means for connecting communication(s) systems grounding conductor(s) at the service equipment or at the disconnecting means for buildings or structures supplied by a feeder or branch circuit.”

How do you ground an electrode?

To qualify as a grounding electrode, there needs to be direct contact with the ground or concrete-encasement that has direct contact with the ground. Steel building frames are often bolted down to bolts that are embedded into the concrete foundation and have no physical contact with the Earth itself.

What is the minimum size grounding conductor you would use for an intersystem grounding termination block?

The bonding bar shall be connected with a minimum 6 AWG copper conductor to an equipment grounding conductor(s) in the service equipment enclosure, meter enclosure, or exposed nonflexible metallic raceway.

What is IBT cable?

The inter-system bonding termination (IBT) is where other services like telephone and cable TV get their ground bonds from the house’s grounding electrode system (ground rods). 2014 NEC (NJ) 250.94 seems to say that an IBT must be placed in proximity to the house service.

Is intersystem bonding required?

The device or piece of equipment used to make an intersystem bonding termination is required to have a minimum of three points of connection to accommodate three bonding conductors for interconnection.



ON THE GROUNDING AND BONDING OF SOLAR PHOTOVOLTAIC SYSTEMS.

Where is intersystem bonding termination device required?

The most common method to bond communications systems is with an intersystem bonding terminal (IBT) in accordance with 250.94(A). The IBT is required to be installed external to the service equipment, or for buildings supplied by other than a service, adjacent to the disconnecting means for the building or structure.

What is the largest size grounding electrode required?

A grounding electrode conductor (GEC) from an electrical service to a ground rod, pipe or plate type electrode is never required to be larger than 6 AWG copper or 4 AWG aluminum unless the GEC continues on from the rod, pipe or plate to connect another electrode that may require a larger GEC such as a concrete encased …

Where an equipment bonding jumper is installed on the outside of a raceway?

The equipment bonding jumper shall be permitted to be installed inside or outside of a raceway or enclosure. Where installed on the outside, the length of the equipment bonding jumper shall not exceed six (6) feet and shall be routed with the raceway or enclosure.

Which of the following electrical systems is not required to be grounded?

Alternating-Current circuits that operate at less than 50 volts are not required to be grounded unless, Figure 3: The primary to the power suply exceeds 150 volts to ground.

What is the minimum size copper equipment bonding jumper for a 40A rated circuit?

10 AWG

The EGC for a 40A protection device can be 10 AWG (10,380 cmil) [Table 250.122], but you must increase it in size by a multiplier of 1.59. Multiple Circuits. When multiple circuits are installed in the same raceway or cable, you need only one EGC in the raceway.

How do you size a supply side bonding jumper?

Quote from the video:
Quote from Youtube video: The supply side bound the jumper we're routed with the parallel raceways is sized based upon the largest ungrounded conductor in each raceway. So this is the rule.

Where do you put the main bonding jumper?

A properly sized equipment bonding jumper is installed from the terminal bar for the grounded service conductor or from the equipment grounding terminal bar to each conduit individually.

Which NEC table is used for sizing grounding electrode conductors and bonding jumpers between electrodes in the grounding electrode system?

Which NEC table is used for sizing grounding electrode conductors and bonding jumpers between electrodes in the grounding electrode system? A grounding electrode conductor installed for a communications system is required to be sized using NEC Table 250.66.

Which table applies to the load side grounding jumpers?

Table 250.122

An equipment bonding jumper on the load side of an overcurrent device is sized from 250.102(D) based on Table 250.122, similar to sizing an equipment grounding conductor from the rating of the overcurrent devices protecting the conductors of the branch circuit or feeder.

What tables are used for bonding jumper systems and grounding electrodes?

Summary: Table 250.102(C)(1) is used to select the Grounded Conductor, Main Bonding Jumper, System Bonding Jumper and Supply-Side Bonding Jumper, based on the size of the largest ungrounded phase conductor.

What NEC article covers grounding and bonding?

Article 250 of the NEC covers the grounding and bonding of electrical systems.

What size ground do I need?

Table 250.122 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment

Does ground wire have to be same gauge?

The answer is yes. The ground wire, hotwire, and neutral wire should be of the same gauge. Because the gauge size is determined by the load current.

How many circuit can share a ground?

The code requires each branch circuit to have an equipment ground (either a wire, or conduit, or cable tray as in 250.120A), they can be shared when they are in the same raceway. If all the 20A circuits are in one raceway then you just need one ground.