Answer / william lobo

The height of the building is not a creiteria for
installing of lightning arrester. If this is the only
building in the area then we have to install the lightning
arrester. But generally it should be installed on the
highest building or tower in the immediate vicinity.

It consists of spikes which can be installed on the
perifery of the building at distances of about 15 to 20
feet.

testing of protective relays will be discussed later.

1. What is maximum permissible distance between smoke detectors ? 2. How do we decide number of smoke detectors required in a large office, warehouse, hall etc ? 3. What should be maximum height of smoke detectors ? 4. Where do we use heat detector, optical smoke detector, temperature sensitive detector ?

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For small size, high frequency coils, the most common core material is- a. )Air b. )Ferrite c.) Powdered ion d.) Steel

0 Answers   Ecil,

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if we give 60 hz single phase supply to the transformer used in europe , than what will happen

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1 Answers   NNN,

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why industry prefer ht motor instead of lt motor.

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2 Answers   JSW,

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I am having dual speed motor of cromton greaves make of 3.7 KW -1400 rpm and 5 KW - 900 rpm. Please let me know groups and winding connction for rewinding purpose.

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What is erection of electrical system?

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