Q: Do I need to run shielded cable or can I run 18-4 with the KCD-W-V CO2 sensor you sell? Here are some of the parameters we were given to help this customer find the right solution: It’s for a retail facility (upper and lower levels). Between 48-60 inches. High voltage. The engineers for the […]
Read PostCategory: Questions From The Field
Tech Talk: I need an explosion-proof control panel with a few pilot lights and…
Q: I’ve been buying explosion-proof enclosures and devices from Kele, and I must say that the Hazardous Locations section of your catalog is a gold mine of hard-to-find products! Now I need an explosion-proof control panel with a few pilot lights and externally operable selector switches mounted on the door of the panel. Can Kele help me with […]
Read PostTech Talk: Timing relays are confusing to me. Can you explain the difference between single-shot and interval timers? What happens if the output driving the relay changes state during a timing sequence?
When all of the possible combinations of timing states and initiating device transitions are considered, a stronger word than “confusing” may be in order! Below are some timing diagrams and sequences of operation in simple terms that may be of help. Since it is an electronic circuit that is energized rather than a coil, the […]
Read PostTech Talk: 3-Phase Motor with One Lost Phase
Q: What happens to a 3-phase motor when one of the phases is lost? The most extreme case of phase unbalance is the total loss of one of the three phases and is known as phase loss or single phasing. Phase loss can be caused by a broken power line, a lightning strike, an open […]
Read PostQ: The intrinsic safety spec I’m reading calls for an isolated ground. Isolated from what?
Answer: A true isolated ground is not connected to any ground that can ever carry fault current from unrelated parts of the electrical system. It is best to run it directly to grounded building structural steel, an underground metal water pipe, or a separate grounding electrode from the building electrical service as described in Article […]
Read Post
