NOVEMBER WINNERS

We had three winners this month: Anuj Vyas, P.E., electrical engineer, Power Distribution Group, Collider-Accelerator Department, Brookhaven National Lab, Upton, N.Y.; Steven G. Rankin, P.E., senior electrical engineer, CB&I, Tyler, Texas; and Chris Apicella, industrial maintenance student, Tennessee Technology Center, Hillsboro, Tenn. They all picked up on the improper bonding jumper connection rather quickly. Here’s what these three had to say:

As you can see in the photograph, the bonding jumper is wrapped around the conduit. According to the requirements of 250.102(E)(2), if installed on the outside of a raceway or enclosure, “the length of the bonding jumper or conductor, or equipment bonding jumper shall not exceed 1.8 m (6 ft) and shall be routed with the raceway or enclosure.” With no measurements in the photo, how do we know the length of the bonding jumper has not exceeded the 6-ft limitation?

It’s also important to note that a bonding jumper should be the same length as the raceway so the impedance increase is insignificant.

I see this type of installation all the time out in the field and am glad someone is addressing it.