I'm an apprentice out of local 46 in seattle. I take pictures of electrical work here and there. I have a question regarding the two starter switches. Each are individually piped on the load and line side to two exaust fans in a parking garage. However, there is a nipple between the two fusable overload protection devices. Any ideas about what this nipple is for. Why are the two starter switches connected together. Any suggestions would be a great help. _thanks--Andrew.
A difficult Answer here. Do you know if there are any wires in the nipple? I see things all the time that seem to have no logical explanation, you might have to find the installer to figure it out. But there could be some common control wirimg. (?)
[This message has been edited by Bill Addiss (edited 05-24-2002).]
Yes, I also have a picture with the starter switches open and I can see that all three phases on the load side of the fuse feed into block (factory wired). The other end of the block goes to feed the fan. while some low voltage colors go through the nipple into the other starter switch. I cant figure out why these two starter switches would need to control. Maybe they both must be on at the same time. So if one stops, so does the other. Well, I very much appreciate your suggestions. Thank you for your replys!-Erik
Is the garage enclosed or open ? Is it possible that one fan is a fresh air supply and one is an exhaust? If so, there could be some sort of interlock to ensure that one is operating before the other starts.