Abstract： ASME A17.5:2019 pdf download.Elevator and escalator electrical equipment. 16.13 For a pilot light consisting of a lampholder in series with a dropping resistor or connected to an autotransformer, the spacings shall be a) not less than 1.2 m...

ASME A17.5:2019 pdf download.Elevator and escalator electrical equipment.

16.13

For a pilot light consisting of a lampholder in series with a dropping resistor or connected to an

autotransformer, the spacings shall be

a) not less than 1.2 mm (0.047 in) between bare live parts of opposite polarity at or within a lampholder (an

inherent lampholder spacing) rated 250 V or less and not less than 3.2 mm (0.125 in) for a lampholder rated more

than 250 V,

b) not less than those specified in Table 5 or in Clause 16.12 between uninsulated live parts of opposite polarity (other than at or within the lampholder), based on the normal operating voltage existing between such parts; and

c) not less than those specified in Table S between bare live parts and grounded parts, exposed

noncurrent-carrying metal parts, or the enclosure, based on the line voltage of the pilot light circuit.

16.14

In a series circuit, the spacings between resistor terminals, transformer taps, and the like shall be based on the normal operating voltage existing between such parts.

16.15

In a push-button switch, selector switch, limit switch, or the like, opposite polarity shall not be considered to exist on any one pole, Including switches with double-throw arrangements, but opposite polarity shall be

considered to exist between poles and between live parts on adjacent units unless the parts in question are

connected to the same line terminal or conductor or marked to indicate the same polarity.

16.16

The spacings at fuses and fuseholders. measured with the fuses in place, shall be determined using fuses that have the maximum standard dimensions, and the spacings shall be not less than those specified In Group A of Table S.

16.17

A ceramic, vitreous-enamel, or similar coating shall not be acceptable as Insulation In place of spacings

unless, upon investigation, the coating is found to be uniform, reliable, and otherwise suitable fo the

purpose.

16.18

If contact arms, blades, etc., in a motor controller remain connected to the motor load terminals when in the OFF position, the spacing from such parts in the OFF position to the enclosure or to exposed noncurrent-carrying

metal parts that are Isolated and/or insulated shall be not less than 3.2 mm (0.125 In) plus the spacings required otherwise.

16.19

Enamelled or similar film coated wire shall be considered to be a bare live part when determining compliance with the spacing requirements in this Standard.

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