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Adopted September 27, 1890, and Superseding

all Previous Rules. Revised in Conjunction with Committee from New England Electric Exchange.


A certificate for all new work or changes in old work (Form “C” for arc, form "F" for incandescent) should be signed by the party installing or controlling any apparatus. The certificate should be filed with the Secretary of the Local Board of Fire Underwriters having jurisdiction, if there be such; otherwise, with the Secretary of the New England Insurance Exchange, Boston.

This certificate is relied upon as a guaranty until the work can be inspected. Permits for the use of the light or power may be granted as soon as the certificate is duly filed,

Blank certificates may be obtained by application to the Secretary of the New England Insurance Exchange, Boston.

All work should be inspected before any of it is concealed, and to this end notice of concealed work must be given this Exchange as soon as work is commenced.

The New England Insurance Exchange reserves the right at any time to add to, change, or modify the accompanying Rules, and to enforce such modifications, changes, etc., as it shall deem necessary for safety; and it will use all reasonable efforts to promptly notify all electric light companies of any such change.

Any additional loading of wires, either in a building as a whole, or in any department thereof, without previous notification to the Exchange, such as is required, shall be deemed a sufficient cause for the suspension of any permit previously granted, until the same shall have been inspected and approved by this Exchange.

This Exchange reserves the right to disapprove of the use of any wire, switch, cutout, or any device, or form of material, which it may consider inconsistent with safety from fire risk, even though it may be proposed to install the same in conformity with these Rules.

The following Rules will be strictly enforced, and in no case will a certificate of inspection be issued for work which does not fully comply with the Rules in all particulars.


Outside Wires.

1. Conducting wires carried over or attached to buildings must be (a) at least seven feet above the highest point of flat roofs, and (b) one foot above the ridge of pitch roofs; (c) when in proximity to other conductors likely to divert any portion of the current, they must be protected by guard irons or wires, or a proper additional insulation, as the case may require.

2. For entering buildings, (a) wires with an extra heavy waterproof insulation must be used, (b) they must be protected by drip loops, (c) also protected from abrasion by awning frames, (d) be at least six inches apart, (e) the holes through which they pass in the outer wall of such building must be bushed with a non-inflammable, waterproof, insulating tube, and (f) should siant upward toward the inside.

3. The inspector may, at his discretion, require wires other than those used for conveying current for electric light or power entering buildings to be protected by some approved automatic cut-out, in any locality where such wires are, in his opinion, liable to come in contact with electric light or power wires.

4. Converters, and the primary wires leading thereto, (a) must not be placed inside of any building (central stations excepted); (b) they may be attached to the walls on the outside if securely supported by substantial wooden cross-pieces or cleats.

5. Wires attached to buildings should be (a) free of contact with the building, and (b) supported by rubber hooks, glass insulators, or porcelain knobs. (Porcelain knobs should not be used to support high potential wires.)

Inside Wires. High Potential (Over 350

Volts) Arc and Series Incandescent.

6. Wires must enter and leave the building (a) at the same place, (b) through an approved cut-out switch, which must be (c) mounted on a non-combustible base if attached to any combustible substance, (d) kept free from moisture, and (e) easy of access to firemen and police.

7. The cut-out switch must be (a) double contact, (6) must effectually close the main circuit and cut off the interior, when turned “off” (c) so constructed that there shall be no arc between the points when thrown “on” or “off,” (d) automatic in its action (not stopping between points when once started), (e) and indicate upon inspection whether the current be “on” or “off.”

8. Wires (a) must be rigidly supported (6) on porcelain, glass, or other non-combustible insulators, (c) free from contact with the building, (d) have waterproof insulation wherever there is a possible exposure to moisture, (e) be at least twelve inches apart, and (f) at least three inches from any other substance capable of acting as a conductor.

9. (a) When wires pass through walls, floors, partitions, etc., (b) or wherever protection from mechanical injury is necessary, (c) they must be protected by glass, hard rubber, or other moisture-proof, non-inflammable tubing. (d) (Soft rubber tubing will not be approved.)

10. (a) No concealed work (b) or wires fastened with metallic staples will be approved.

11. In perfectiy dry places wires (a) supported by wooden cleats, which (6) are“ filled” to prevent the absorption of moisture, and (c) have a backing so as to separate the wire at least one fourth inch from the building, may be approved by the inspector.

12. A wire (a) having a non-inflammable insulation, and (b) inclosed in a moistureproof (c) insulating conduit or tubing (d) sufficiently strong to protect the wire from mechanical injury, may be used, in which case the tube may be fastened by metallic loops if desired, and the distance between wires reduced to three inches; but (e) the entire “conduit system” must be moisture-tighti. e., joints and open ends must be sealed with some approved cement.

13. The “series" incandescent lamp must (a) be provided with a proper hand switch, and (6) an approved automatic device which will

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