Section 26 - Installation of Equipment Flashcards
Why would you not fuse the conductors on the secondary side of a current transformer?
Opening this part of the circuit causes a high induced voltage in the secondary.
A service room is a room or space in a building for the building’s _____________ equipment and constructed according to the National Building Code or local legislation equivalent.
Service
A vault is….
An isolated enclosure, which could be above or below ground with fire resisting floors, ceilings, and walls. A vault contains transformers and other electrical equipment.
Do switchboard rules apply to switchgear?
Yes. The main difference is that switchgear is primarily used in high voltage settings. The requirements apply to both and may be more stringent based on voltage levels.
Which rules talk about working space around electrical equipment?
2-308
2-310
2-326
A panelboard should be installed as high as possible as long as the the highest ______ _______ is not higher that ____m from ground level.
Breaker Handle
1.7m
Name some undesirable, non-approved locations for panelboards.
Bathrooms
Stairways
Clothes Closets
Section 14 ILM
Thermal Trip Element reacts to what?
Overloads
Section 14 ILM
An electromagnetic trip element reacts to what?
Short Circuits
Some breakers are Instantaneous Trip and do not have the thermal element.
True or False?
True.
Bimetal strips, provide a lengthy time to wait on light overloads yet have a faster response on heavier overloads. This is called an…
Inverse Time Characteristic
A 100A circuit breaker trips, faster with an overcurrent of 500A than it does with an overcurrent of only 125A.
True or False?
True. Because of the Inverse Time Characteristic.
Name the five parts of a breakers tripping mechanisms.
Trip Bar, Electromagnet, Latch, Contacts, Bimetal Strip
What is CRI and what does it indicate?
Colour Rendering Index - A value that indicates how well a light source reproduces the actual colours of an object.
A CRI of 100 is ideal; a lower number distorts colour appearance
