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Monday, June 26, 2017

Monthly Archives: September 1998

Outlet boxes for Ceiling Fans

Question: For outlet boxes that support ceiling suspended fans, does UL consider out-of-balance fans? Answer: Section 422.18(a) Section 422-18(a) of the 1996 National Electrical Code permits...

Overhead Line Design from Scratch—Part 4

In Part 3 (July/August issue) we determined the height of our structures and the strength of our structures and foundations to comply with the...

Variances in Exit Signs

Question: Exit Signs I've noticed that the color, size, and visibility of exit signs varies greatly. Do UL requirements permit these variances? Answer: UL 924 UL...

Substation Grounding

Not long ago I wrote an article on substation grounding for Electrical Business that raised the issue of whether one should interconnect the building reinforcing steel with the station ground electrode. A reader responded with the question of whether the best approach might be to ignore the rebar bonding.

Beinvenidos Mexico

Mexican electrical inspectors must now comply with accreditation, much the same as the ISO 9000.

The Grounding Electrode

As metal piping is being replaced by plastic piping, we're losing one of our best means of connecting electrical systems to the earth through low impedance.

Services for Multi-Occupancy Buildings

In light of the 1999 Code changes, Phil Simmons takes a third look at multiple disconnects grouped in one location.
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