Bus duct FAQ

About the appearance

What are the external dimensions (weight) of the Bus duct and branch box?

The external dimensions (weight) of Bus ducts and branch boxes can be confirmed in the dimension tables in the various Bus duct catalogs.
For more detailed dimensions, please download the drawings from the "CAD Data Library".

Product Catalog

CAD data library

About construction

What is the fire prevention method?

In the event of a fire, smoke and fire prevention measures are taken at the parts (floors, walls, etc.) that penetrate fire compartments to prevent the wiring from spreading and filling safe compartments with smoke, hindering evacuation and spreading the fire.

List of partition penetration processing methods

What are the different uses for shaft star floor supports?

The vertically laid Shaftstar floor support system

①	Fixed floor support: Installed on the lowest floor of the vertically laid floor support section
②	Intermediate floor support: Installed on intermediate floors other than ① and ③
③	Spring floor support: Installed within 50m of the top floor of the vertical installation floor support section and the vertical installation length

The above method is used as shown in the left figure.
The expansion caused by the thermal expansion of the shaft star is transferred to the upper floors by the intermediate floor supports on the middle floors, starting from the fixed floor on the lowest floor, and is then absorbed by the spring floor supports on the top floor.

Can I connect to Bus ducts made by other companies?

Since the connection parts differ depending on the manufacturer, it cannot be connected to products from other companies.
However, low-voltage Bus ducts made by Hitachi Cable and Mitsubishi Cable can be connected by attaching an adapter.
(Depending on the specifications, it may not be possible to manufacture the product, so an on-site inspection is required. Please contact your nearest sales office.)

Delivery, delivery time and price

Q: What is the packaging like?

When delivering Bus Ducts, the straight ones are grouped together, and the rest are individually wrapped in polyethylene sheets, placed on wooden pallets, and secured with bands.

Please tell me the size of the delivery vehicle.

Please refer to the diagram below for the size of the delivery vehicle.

Please tell me about production lead times and stock availability.

For the normal production time of Bus duct, please contact your nearest sales office.
In addition, with regard to stock items, except for parts such as bolts, they are made to order, so please ensure that you can ensure a production lead time.

I would like to know the unit price and price list.

Regarding unit prices and price lists, due to large fluctuations in the purchase prices of raw materials and other items and the wide variety of specifications, we are currently unable to provide a price list to customers.
We apologize for the inconvenience, but please contact your nearest sales office.

Electrical performance

Please tell me about case earths and grounding wires.

Since Bus duct construction is the connection and extension of a single Bus duct, the connections between ducts and conductors must be securely connected both mechanically and electrically. Our Bus ducts use a case earth method for electrical connections at their connections.
The interpretation of the Electrical Equipment Technical Standards (Article 163 Bus duct construction, paragraph 1) requires that "ducts and electric wires must be firmly and completely connected electrically," but there are no regulations regarding "electrical connections."
Therefore, the electrical connection of the duct connection part of our Bus duct should be carried out by carrying out the grounding work (Type C or D grounding work) prescribed in Article 163 of the Interpretation of the Technical Standards for Electrical Equipment, and further by using a method that obtains the respective grounding resistance values ​​prescribed in Article 17 of the Interpretation of the Technical Standards for Electrical Equipment.
At our company, the thickness of the bond wire between the Bus duct and the equipment connection box is KIV electric wire 38 sq x 2.
For more details, please refer to the following PDF.

Bus duct grounding wire thickness

What about connections with dissimilar metals?

For Bus duct conductor connections, both aluminum and copper conductors are electroplated.
The contact surfaces are greased before connection, so they are electroplated and do not suffer from electrolytic corrosion.
Even when the copper terminals of devices are tin-plated (or silver-plated), the contact between the aluminum conductor and the copper conductor is replaced by contact between the tin-plated (or silver-plated) and electroplated, and grease is applied to prevent the infiltration of electrolyte and prevent electrolytic corrosion.