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The circuit schedule shows all of the information that is needed

to pull and terminate each circuit.

Terminations and Circuit Schedules

Example of a schematic

Example of a circuit schedule

The schematic (or diagram) is a graphical

representation of how cables are terminated

in a terminal block.

For example - look at this circuit number

This is a more detailed description of

where the circuit is routed from.

If there are further comments they would be listed here. Here they are more detailed

descriptions of what the cables are going to.

This is a more detailed description of where the circuit is routed to.

This shows which schematic the cable is routed from. In this case EI-703 represents the engineer's drawing number and the 110-ER-0003-001 SH72 is the vendor's drawing schematic number.

This shows which schematic the cable is routed from. In this case EI-701 represents the engineer's drawing number and the 110-ER-0003-001 SH72 is the vendor's drawing number.

This shows the cable type that is to be

pulled. Here the "V" stands for vendor,

KX is a thermocouple type cable and 1P16 is 1 twisted pair 16 gauge cable.

This column shows

the equipment number

that the circuit is written from.

These are circuit numbers. Each number represents a cable that needs to be pulled

This column shows

the equipment number

that the circuit is written to.

If the circuit

goes to a specific

section of a

junction box

its listed here.

TBB means

"Terminal Block - B"

The engineer typically proves the routing

which would show which conduits the cables are supposed to go through. These are vendor supplied cables and vendor routed cables so there isn't a specific route. The engineer typically includes a length as well.

Terminated on TBB - Terminal block "B"

This is the same circuit name on the schematic

Location of conductors are landed

This is the type of cable

(yellow)

This is the device it's

terminated to

Drawing number

(red)

(shield)

Types of Terminations

Here the screw is tightened

against the conductor. If the

specifications had required

ferrules they would have been

used here.

A good termination won't show

any conductor under the terminal.

Termination diagram for an instrument

Ring Term

Insulated

fork

Below are some common types of terminations.

Check specifications to see what is required.

Ferrule

Ferrules are sometimes required in the

specifications. They are used to make sure that all of the conductors make good contact with the terminal. Ferrules are generally an extra step that we try to avoid if possible.

Uninsulated

fork

Fork

These are typically preferred over ring

terms because you don't have to completely

remove the screw to set the wire in.

We try to avoid these for the same

reason that we prefer fork. Also,

if startup has to go through and

remove any wires, they then have

to take the screw completely out.

Ring

One of our best practices is to

use a cable stripper instead of a knife

to cut the jacket off.

Once the jacket is off a regular

pair of strippers can be used to

strip the insulation to get to the

bare conductor.

Crimping tools are made of specific types of lugs and brands. Make sure the correct tools are purchased.

Motor terminated with lugs

on a terminal block.

Long barrel one hole

Cable in a panel terminated

directly onto a block without a lug

Types of lugs

Long barrel two hole

Cable terminated on bus

with lugs

Short barrel one hole

Tools for crimping lugs

Again, a wire stripper is

used to expose the

conductor

Battery operated

Hydraulically operated

Mechanically operated

Range of lugs

Dies go inside of the tools

to make sure the connection is correct

- Small instrument and control cable

- Power cables - lug terminations

- Power cables - motors

- Power cables - wire nuts

- Medium Voltage

Some motors come

with terminal blocks

In other motors the leads

are lose and need to be

spliced to the feeder.

Lead Kit

This can be done by either

taping them together or a

motor lead connection kit

can be bought.

Taped

Typically we only use wire nuts

on non process work - lighting and

receptacles.

Wire nuts are rated for different sizes by color. The correct nut must be used.

Weather tight spring nuts must be used outdoors

With a load break elbow,

the connection is actually

inside of the insulated boot

An example of how a medium voltage termination is made

Another best practice is to

use the speed systems product

on medium voltage terminations.

This one tool will strip the jacket,

the semiconductor and the insulation without the need for a knife.

A live front termination

is connected straight to

the buss with no additional

protection

Cold shrink is easier and safer than using heat shrink.

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