Changeover Switches

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      Frequently Asked Questions

      Can a longer manual operating handle be used instead of the handle specified in the catalogue? 

      Yes, usage of the next biggest handle size to what is specified is permitted, refrain from using a handle longer than that. For example, if you have a 160 A change over switch (OT160E03CP) with a 65 mm pistol handle OHB65J6E011, you can also use a 95 mm handle OHB95J12E011. Handles with length 125 mm and longer are not allowed. 

      Can the fourth pole be added later on?

      No. It is a must that change-over and transfer switches be ordered as specific 3 or 4 pole version and no alterations are permitted later on.

      How can the load side terminals of a manual change-over switch be connected together? 

      A wide range of bridging bars are offered solely for this purpose. They require to be ordered separately.

      The small-scale change-over switch is very difficult to operate with the handle knob. Is there a way to make the operation easier? 

      The small handle knob in the switches from 16A to 125 A is just for position indication, not for operation. An operating handle and shaft need to be ordered separately. 

      Why doesn't usage of standard terminal shrouds in manual change-over switches provide full protection?  

      The terminal covers provide a IP20 degree of protection only from the front. In order to enhance protection, it is recommended to create transparent plex to cover the connections to secure the gap between lines and the terminal covers.

      How significant is the one pole construction in manual change-over switches in terms of energy efficiency?

      Manual Change-over switches by ABB come with a real one pole construction even in higher ratings (one line per power line), facilitating savings in terms of energy consumption by lowering power loss. The usage of additional fixing sets in order to do connections is eliminated due to the presence of a single terminal per pole. 

      In what applications can the enclosed changeover switches be used?

      ABB enclosed changeover switches operate under the following utilization categories, 

      • AC-31 for non-inductive or slightly inductive load  
      • AC-33 for motor loads or mixed loads including motors 

      ABB change-over switches are rated according to IEC 60947-6-1 standard. 

      Does the ABB enclosed changeover switches meet the bypass requirement? 

      In order to comply with BS8519 which states “Where the availability of the life safety and fire-fighting equipment is conditional to the occupation of the building, a bypass arrangement should be incorporated to enable the changeover device to be maintained without loss of service from the critical plant”, the bypass switches consist of the following;  

      Single or mains bypass: A closed transition manual changeover switch is included to allow for the seamless (no 0-position giving no break in supply when moving to bypass) transition to bypass. The front of the panel should indicate that it has been bypassed and is safe to carry out maintenance.  

      Dual Bypass: A closed transition manual changeover switch is included to allow for the seamless (no 0-position giving no break in supply when moving to bypass) transition to bypass. Together with a standard manual changeover switch to allow you to choose between supply 1 or supply 2. The front of the panel should indicate that it has been bypassed and which supply is feeding the load and is safe to carry out maintenance. 

      What are the suitable installation locations for enclosed changeover switches? 

      The enclosed ABB changeover switches have an ingress protection rating of up to IP66 against dust and strong jets of water, thus very well suited for outdoor installations. Available in polyester or mild steel enclosures, with a lightweight design and RAL7035 smooth finish unlike the powder coated mild steel range, which shows high impact strength. 

      what is the difference between a bonded-neutral portable generator and a floating-neutral portable generator?

      Most portable generators will come in 2 main types, defined by the internal wiring of the generator related to the neutral and ground. The neutral and ground are both tied together, or separated, inside the generator. A bonded-neutral generator is a generator with the neutral and ground tied together. It might also be described as?neutral bonded to frame. A generator with the neutral and ground isolated and separated from each other, is referred to as a?floating-neutral?generator. 

      Does it matter if the generator is GFCI (Ground Fault Circuit Interruption) protected?  

      Certain industrial or commercial generators must be bonded-neutral to pass OSHA inspection on job sites, which is why there are many generators with the bonded-neutral attribute. Certain bonded-neutral generators also might have GFCI (Ground Fault Circuit Interruption) protection built-in, due to other necessities on installation sites related to ground fault protection. It’s essential to identify these generator attributes at the time of selecting a generator and transfer switch, because it’s possible that some on site generators with GFCI protection will require a special type of transfer switch installation. 

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