Our pipefitters have routed a steam line directly above a couple of NEMA-1 electrical panels. It has been pointed out that this is a potential violation of NEC 110.34(F) which states: "Pipes or ducts foreign to the electrical installation and requiring periodic maintenance or whose malfunction...
I have an application where I need to switch a 1200uF capacitor charged by a half-wave rectified 120VAC supply, or 170VDC across the contacts. The relay coil will need to be supplied from the 120VAC source. I have spent all day to no avail looking for a suitable relay with a 120V coil and...
Our facility has a power management system based on a Siemens S7 PLC polling about 100 Siemens 9610 multifunction relays which are daisy-chained together with 4-wire RS485 serial cable. We recently experienced a total loss of facility power, and the power monitoring system completely froze up...
I'm designing a lifting device with about 10 feet of vertical motion and with a load capacity of about 2 tons. I would like to use the four support columns themselves as linear bearing guides for the vertical motion. I'm envisioning C-channel columns constraining roller or slide bearings. Any...
