I was in a plant where they were running 3 conductor w/ground cable from the bus boxes to their equipment for 25' + distances without using cable tray or conduit. Most cases the cables ran to over the equipment and hung down from a single rubber tube covered chain loop tied to a beam rafter. Does code allow for this? Does not look right to me.
480 V / 200 Amp drop from BUS head to Ind. equipment
- Thread starter mchenney
- Start date
- Status
- Location
- Illinois
- Occupation
- retired electrician
Re: 480 V / 200 Amp drop from BUS head to Ind. equipment
Looks like it could be in compliance with 368.8(B). You would have to review the installation with attention to all of the requirements in that section.
Don
Looks like it could be in compliance with 368.8(B). You would have to review the installation with attention to all of the requirements in that section.
Don
Re: 480 V / 200 Amp drop from BUS head to Ind. equipment
Been awhile for me but I would have thought 6' too, unless maybe allowed for a TRUE temporary installation, which is NOT the case here. They were using BIG Killum type strain relief on both ends, bus header disconnect / fuse box and control cab / disconnect ( w/ a ground lead too )
Been awhile for me but I would have thought 6' too, unless maybe allowed for a TRUE temporary installation, which is NOT the case here. They were using BIG Killum type strain relief on both ends, bus header disconnect / fuse box and control cab / disconnect ( w/ a ground lead too )
Re: 480 V / 200 Amp drop from BUS head to Ind. equipment
Gentlemen,I have my '05 book handy..
Article 368 Busways
368.56 (B)Cord and Cable Assemblies. Suitable cord and cable assemblies approved for extra-hard usage or hard usage,and listed bus drop cable shall be permitted as branches from busways for the connection of portable equipment or the connection of stationary equipment to facilitate their interchange in accordance with 400.7 and 400.8 and the following conditions:
(1)The cord shall be attached to the building by approved means.
(2) The length of the cord or cable from the busway plug-in device to suitable tension take-up support device shall not exceed 1.8m(6ft).
(C)*The cord and cable shall be installed as a verticle riser from the tension take-up support device to the equipment served.
(D)Strain relief cable grips shall be provided for the cord or cable at the busway plug-in device and equipment terminations.
Exception to (B)(2): In industrial establishments only,where the conditions of maintenance and supervision ensure that only qualified persons service the installation, lengths exceeding 1.8m(6ft) shall be permitted between the busway plug-in device where the cord or cable is supported at intervals not exceeding 2.5m(8ft).
[ October 08, 2005, 05:08 AM: Message edited by: dillon3c ]
Gentlemen,I have my '05 book handy..
Article 368 Busways
368.56 (B)Cord and Cable Assemblies. Suitable cord and cable assemblies approved for extra-hard usage or hard usage,and listed bus drop cable shall be permitted as branches from busways for the connection of portable equipment or the connection of stationary equipment to facilitate their interchange in accordance with 400.7 and 400.8 and the following conditions:
(1)The cord shall be attached to the building by approved means.
(2) The length of the cord or cable from the busway plug-in device to suitable tension take-up support device shall not exceed 1.8m(6ft).
(C)*The cord and cable shall be installed as a verticle riser from the tension take-up support device to the equipment served.
(D)Strain relief cable grips shall be provided for the cord or cable at the busway plug-in device and equipment terminations.
Exception to (B)(2): In industrial establishments only,where the conditions of maintenance and supervision ensure that only qualified persons service the installation, lengths exceeding 1.8m(6ft) shall be permitted between the busway plug-in device where the cord or cable is supported at intervals not exceeding 2.5m(8ft).
[ October 08, 2005, 05:08 AM: Message edited by: dillon3c ]
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Re: 480 V / 200 Amp drop from BUS head to Ind. equipment
The 6 foot distance is to the first "support" not the overall length of the drop. All of the exceptions are to this 6' distance.
I see no code violation based on the information given in the original posting.
The 6 foot distance is to the first "support" not the overall length of the drop. All of the exceptions are to this 6' distance.
I see no code violation based on the information given in the original posting.
- Status